Federal Nuclear and Regulatory Authority of Russia (GOSATOMNADZOR OF RUSSIA) FEDERAL STANDARDS AND RULES IN THE FIELD OF USE OF ATOMIC ENERGY APPROVED BY Order № 6 of Gosatomnadzor of the USSR of 11 May 1989 EQUIPMENT AND PIPING OF NUCLEAR POWER INSTALLATIONS. WELDING AND OVERLAYING WELDING. BASIC PROVISIONS PNAE G-7-009-89 AMENDMENT № 1 to PNAE G-7-009-89 “Equipment and Piping of Nuclear Power Installations. Welding and Overlaying Welding. Basic Provisions” Effective since 1 June 1990 Moscow 2000 UDK 621.039 Equipment and piping of nuclear power installations. Welding and overlaying, basic provisions PNAE G-7-009-89: Regulatory document. - M.: SEC NRS of Gosatomnadzor of Russia, 2000, 172 pages. These Basic Provisions (BP) cover the welding and overlaying of equipment and piping, which are not subject to the “Rules for Layout and Safe Operation of Equipment and Piping of Nuclear Power Installations (hereinafter referred to as NPI Rules). These BP establish basic requirements to welding equipment, welding materials, preparing and assembling for welding, welding, overlaying, heat treatment of welded joints and overlaid parts (items), safety-at-works, as well as to the main recommended types of welded joints and modes of welding (overlaying). The repair of structures in use should be conducted in accordance with a process developed pursuant these BP and taking into account the features of the structure to be repaired. TABLE OF CONTENTS 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. General provisions Welding materials Requirements to welding equipment Requirements to personnel Preparing and assembling of parts for welding (overlaying) 5.1. General requirements 5.2. Preparing for welding (overlaying) 5.3. Assembling Welding 6.1. General requirements 6.2. Heating during welding (overlaying) 6.3. Welding of parts made of steels of different structural classes 6.4. Welding of parts made of two-ply steels 6.5. Electroslag welding 6.6. Argon-arc welding Overlaying of corrosion resistant coatings 7.1. General requirements 7.2. Overlaying procedure Heat treatment Elimination of defects Marking of welded joints and overlaid parts (items) Safety requirements Requirements to structural shapes of welded joints Exemptions from established requirements Attachment 1. Reference book of regulatory and technical documentation for welding materials permitted for manufacturing, assembling and repair of equipment and piping of nuclear power installations Attachment 2. Provisional welding and overlaying modes Attachment 3. Main types of welded joints 1. General Provisions 1.1. These BP include the requirements to: 1.1.1. Welding of parts made of steel grades: ОтЗсп5, 10, 15, 20, 15Л, 20Л, 25Л, 20К, 22К, 15ГС, 16ГС, 20СГЛ, 09Г2С, 10ХСНД, 10ХН1М, 16ГНМА, 15ГНМФА, 12МХ, 12ХМ, 15ХМ, 20ХМ, 20ХМА, 10Х2М, 12Х1МФ, 15Х1М1Ф, 10ГН2МФА, 10ГН2МФАЛ, 12Х2МФА, 15Х2МФА, 15Х2МФА-А, 18Х2МФА, 15Х2НМФА, 15Х2НМФА-А, 15Х3НМФА-А (hereinafter the above listed steel grades are referred to as “perlitic steels”; the steel grades СтЗсп5, 10. 15, 20, 15Л, 20Л, 25Л, 20К, 22К are referred to as “carbon steels”; the steel grades 15ГС, 16ГС, 20ГСЛ, 09Г2С – as “manganese-silicon steels”; and other steel grades – as “alloyed steels”). 1.1.2. Welding of parts made of high-alloyed steel grades 08Х13, 05Х12Н2М, 06Х12НЗД, 06Х12НЗДЛ, 08Х14МФ, 1Х12В2МФ, 07Х16Н4Б (hereinafter the above listed steel grades are referred to as “high-chromium steels”). 1.1.3. Welding of parts made of high-alloyed corrosion resistant steel grades 08Х18Н9, 09Х18Н9, 10Х18Н9, 12Х18Н9, 08Х18Н10, 03Х16Н9М2, 08Х16Н11М3, 10Х18Н12МЗЛ, 10Х18Н9ТЛ, 12Х18Н9Т, 12Х18Н9ТЛ, 06Х18Н10Т, 08Х18Н10Т, 12Х18Н10Т, 08Х18Н12Т, 12Х18Н12Т, 10Х17Н13М2Т, 10Х17Н13МЗТ, 10Х18Н12МЗТЛ (hereinafter the above listed steel grades are referred to as “austenitic steels”). 1.1.4. Welding of parts made of iron-nickel alloy grades 03Х21Н32МЗБ, Х15Н35ВЗТ, 10Х16Н36МЗТЮБР among themselves and the parts made of austenitic steels. 1.1.5. Welding of parts made of perlitic steels with parts made of high-chromium steels and austenitic steels; parts made of high-chromium steels with parts made of austenitic steels (hereinafter referred to as “welding of parts made of different structural steel grades”). 1.1.6. Welding of parts made of two-ply steels. 1.1.7. Overlaying of corrosion resistant coating. 1.1.8. Reinforcing overlaying. 1.2. The design documentation for welded joints (overlays) should be agreed upon with the manufacturing enterprise (assembling organization). 1.3 Welding and overlaying should be conducted in accordance with the process and engineering documentation (PED) (process instructions or process flowcharts) generated considering the requirements of these BP, regulatory document “Equipment and Piping of Nuclear Power Installations. Welding and Overlaying. Rules for Inspection of Welded Joints and Overlaid Parts” (hereinafter referred to as RFI) and design documentation. PED should be agreed upon in accordance with the procedure established in NPI Rules, Section 4. The same procedure is applied for modifications to the above documentation as regards the base and welding materials, heating and heat treatment. 1.4. Welding of materials, which are not indicated in these BP but permitted for use by NPI Rules is allowed as agreed upon with Gosatomenergonadzor of the USSR and in accordance with PED developed by the manufacturing enterprise (assembling organization) taking into account the requirements of these BP and concurred with the Industry and Interagency Leading Material Study Organizations. It is allowed to apply PED developed by the Leading Material Study Organization. N o t e . Hereinafter the Leading Material Study Organization should mean the Industry Leading Material Study Organization. 1.5. The use of welding (overlaying) techniques and/or welding materials, which are not indicated in these BP, is allowed pursuant the procedure established in NPI Rules for the use of new materials. 2. Welding Materials 2.1. The welding materials permitted for fabrication of welded joints of Categories I, II and III and overlaying are given in Tables 1-5, and of welding joints of Categories Iн and IIн are given in Tables 6-8. Definitions are given in RFI document. 2.2. The limiting permissible temperature at which the welded joints of Categories I, II or III fabricated in accordance with these BP are to be used is similar to that established by NPI Rules for steel grades the welded parts are made of, and in case of welded joints of Categories Iн and IIн it is given in Tables 6-8. 2.3. The welding materials for welding of parts (assembly units) should be the welding materials intended for fabrication of welded joints of parts made of corresponding steel (alloy) grades. 2.4 During assembling of parts and assembly units made of two-ply steels the tack welds are fabricated in accordance with the requirements of these BP, para. 6.4. During assembling of parts made of perlitic steels (except for parts made of steel grades 15Х2МФА-А and 15Х2НМФА-А to be joined among themselves) it is allowed to use for tack welds: • welding electrodes УОНИИ-13/45, УОНИИ-13/45А and УОНИИ-13/55, ЦУ-7, ЦУ-7А, ТМУ-21У for manual coated electrode welding (only first three types of welding electrodes are allowed for assembling of the parts to be in contact with liquid metal coolant); • welding wire Св-08ГС and Св-08Г2С for argon-arc tack welding. Welding electrodes УОНИИ-13/45АА, УОНИИ-13/55АА or ЦУ-7А should be used for tack welding of parts made of steel grades 15Х2МФА-А or 15Х2НМФА-А among themselves. 2.5. In case of weld root welding of parts’ joints (assembly units) made of alloyed steels joined together or with manganese-silicon and carbon steels (except for welded joints of parts made of steel grades 15Х2МФА-А or 15Х2НМФА-А among themselves) it is allowed to use: 2.5.1. For manual arc coated electrode welding and argon-arc welding – the same welding electrodes as for the tack welding as per Subsection 2.4. 2.5.2. For automated hidden arc welding – the welding wire Св-08А, Св-08АА and Св08АА-ВИ in combination with fluxing agents ОСЦ-45, АН-348А, АН-42, АН-42М and НФ-18М; the welding wire Св-06А in combination with fluxing agents АН-42, АН-42М and НФ-18М; as well as the welding wire Св-08ГА in combination with fluxing agent ФЦ-16. N o t e . Weld root should be not more than 30% of the nominal thickness of the parts being welded (design angle weld height) but not more than 20 mm. 2.6. The corresponding welding materials indicated in Table 1 should be used for welding of weld roots of parts made of steel grades 15Х2МФА-А or 15Х2НМФА-А among themselves. Besides the welding materials as per Table 9 are permitted. 2.7. To fabricate welding joints of Category III of parts made of steel grades Ст3сп5, 10, 15, 15Л, 20Л and 25Л it is allowed to use welding electrodes МР-3, 0ЗС-4, 0ЗС-6, and АНО-4, and to fabricate welding joints of the same Category of parts made of steel 12Х1МФ the welding electrodes ТМЛ-1У and ТМЛ-3У are allowed. 2.8. Welding materials should meet the requirements of standards, specifications and charts indicated in Attachment 1 and have a certificate. 2.9. Welding materials should be stored as batches and their use for designated purpose should be ensured. 2.10. A definition of the coated welding electrode batch is given: for manual arc welding – as per GOST 9466-75; for welding wire – as per GOST 2246-70; for overlaying tape – as per GOST 4986-79; for fluxing agent – as per GOST 9087-81. Table 1 Welding materials to fabricate welded joints of parts made of perlitic steels (except for welded joints of Categories Iн and IIн) Steel grades of parts being welded 1 СтЗсп5,10,15, 15Л, 20, 20Л, 25Л, 20К, among themselves, with steel 22К, with manganesesilicon and alloyed steels Coated electrodes for manual arc welding 2 УОНИИ-13/45 УОНИИ13/45А УОНИИ-13/55 ЦУ-5, ЦУ-6, ЦУ-7, ЦУ-7А, ТМУ-21У Grades of welding materials in use For automated hidden arc welding Welding wire for argon-arc welding Wire Fluxing agent (including gas shielded welding) 3 4 5 Св-08А ОСЦ-45, Св-08ГС, АН-42, Св-08АА Св-08Г2С, АН-42М, Св-08ГА Св-06А АН-348А, АН-348АМ, ФЦ-16 Св-06А АН-42, АН-42М, НФ-18М Св-08ГСМТ АН-42, АН-42М, КФ-30 For electroslag welding Wire Fluxing agent 6 Св-10Г2, Св-12ГС, Св-08ГСМТ 7 ОСЦ-45, АН-8 Note 8 Wire Св08ГСМТ in combination with fluxing agents АН-42 and АН-42М; and wire Св08ГС in combination with fluxing agents ФЦ11 and ФЦ-16 are used for automated hidden arc welding of steel grade 22К with nominal Св-08ГС Св-10Г2, Св-08ГА 22К with 22К and steel grades 15ГС, 16ГС, 20ГСЛ, 09Г2С, 10ГН2МФА, 10ГН2МФАЛ, 15Х2НМФА 15Х2НМФА-А УОНИИ-13/45 УОНИИ13/45А УОНИИ-13/55 ЦУ-5, ЦУ-6, ЦУ-7, ЦУ-7А, ТМУ-21У Св-10Г2 Св-08А, Св-08АА Св-06А Св-08ГСМТ ФЦ-11, ФЦ-16, ФЦ-22, КФ19, КФ-30 ФЦ-11, ФЦ-16, КФ-27 ФЦ-22 ОСЦ-45, АН-42, АН-42М, АН-348А, АН-348АМ, ФЦ-16 АН-42, АН-42М, НФ-18М ОСЦ-45, АН-42, АН-42М, АН-348А, АН-348АМ, КФ-30 wall thickness more than 36mm. At this, the weld root layers are made with welding wire Св-08А or Св-08АА Св-08ГС, Св-08Г2С, Св-06А Св-10Г2, Св-12ГС, Св-08ГСМТ ОСЦ-45, АН-8 Св-08ГС 15ГС, 16ГС, 20ГСЛ, 09Г2С with steel grades 15ГС, 16ГС, 20ГСЛ, 09Г2С, 10ХСНД, 16ГНМА, 15ГНМФА, 12ХМ, 15ХМ, 20ХМ, 20ХМА, 10Х2М, 12Х1МФ, 15Х1М1Ф in any combination 10ХСНД with 10ХСНД УОНИИ-13/55 ЦУ-5, ЦУ-7, ЦУ-7А ТМУ-21У УОНИИ-13/45, УОНИИ13/45А УОНИИ-13/55 ТМУ-21У, ЦУ5, ЦУ-6, ЦУ-7, ЦУ-7А Св-08ГС, Св-12ГС Св-10Г2, Св-08ГС Св-08ГА, Св-10ГА ФЦ-11, ФЦ-16, КФ-19, КФ30, ФЦ-22 ФЦ-11, ФЦ-16, КФ-19 ФЦ-22 ОСЦ-45, АН-348А, АН-348АМ Св-08ГС, Св-08Г2С Св-10Г2, Св-12ГС ОСЦ-45, АН-8 Welding electrodes ЦУ-5 are used only for welding of weld roots. Св-08ГС, Св-08Г2С Св-10Г2 ОСЦ-45, АН-8, ОФ-6 Welding electrodes ЦУ-5 are used only for welding of weld roots. 10ХН1М with 10ХН1М and with 10ХСНД УОНИИ-13/45 УОНИИ13/45А УОНИИ-13/55 Н-20, Н-25 Св-08ГСМТ Св-10НМА Св-08ГА, Св-10ГА Св-10ГН1МА 16ГНМА with 16ГНМА and with 15ГНМФА, 12ХМ, 15ХМ, 20ХМ, 20ХМА 15ГНМФА with 15ГНМФА and with 12ХМ, 15ХМ, 20ХМ, 20ХМА ЦЛ-21, ЦЛ-48 ЦЛ-52 Св-10НМА Св-10ГНМА КФ-30, АН42, АН-42М АН-42, АН-42М ОСЦ-45, АН-348А, АН-348АМ КФ-27, КФ30 ФЦ-11, ФЦ16 ФЦ-11, ФЦ16 Св-08ГС, Св-08Г2С Св-04Х2МА, Св-08ГСМТ ОФ-6 Св-10НМА Св-10НМА ФЦ-11, АН-8, ОФ-6 Св-10ГНМА - - - - 10ГН2МФА, 10ГН2МФАЛ with 10ГН2МФА and 10ГН2МФАЛ and with 15Х2НМФА, 15Х2НМФАА, 15Х3НМФА, 15Х3НМФАА 12МХ, 12ХМ, 15ХМ, 20ХМ among themselves and with 20ХМА, 12Х1МФ, 15Х1М1Ф 10Х2М with 10Х2М and with 12ХМ, 15ХМ, 12Х1МФ, 15Х1М1Ф 20ХМА with 20ХМА ПТ-30 ЦЛ-59 Св-10ГНМА Св-10ГН1МА ФЦ-16 Св-10ГНМА, Св-10ГН1МА Н-3, ЦУ-2ХМ, ЦЛ-38 Св-08ХМ ФЦ-11, КФ16 Св-08ХМ, Св-08ХГСМА Н-10 Св-04Х2МА КФ-16 Св-04Х2МА Н-3, ЦУ-2ХМ, ЦЛ-38 Св-08ХМ, Св-08ХМФА АН-42, АН-42М - Св-10ГН2МФА - ОФ-6, ФЦ-21 - - - For argon-arc welding it is allowed to use welding wire when silicon content is not less than 0.22% - For argon-arc welding it is allowed to use welding wire Св08ХМ when silicon content is not less than 0.22% - - - 12Х1МФ, 15Х1М1Ф with 12Х1МФ, 15Х1М1Ф Н-6, ЦЛ-20, ЦЛ-39, ЦЛ-45 Св-08ХМФА ФЦ-11, ФЦ-16, КФ-16 Св-08ХМФА, Св-08ХГСМФА 15Х3НМФА with 15Х3НМФА and 15Х3НМФАА 15Х2НМФА with 15Х2НМФА and with 15Х2НМФАА РТ-45Б, Н-23 Св-09ХГНМТА, Св-09ХГНМТААВИ НФ-18М, КФ-30 Св-08ГСМА, Св-08ГСМТА Св16Х2НМФТА ОФ-6 РТ-45А, РТ-45АА, РТ-45Б Св-12Х2Н2МА, Св-12Х2Н2МАА ФЦ-16 Св-12Х2Н2МА, Св-12Х2Н2МАА Св16Х2НМФТА ОФ-6, ФЦ-21 Св-09ХГНМТА, Св-09ХГНМТААВИ Св-09ХГНМТААВИ НФ-18М Св-09ХГНМТА Св-09ХГНМТААВИ Св-12Х2Н2МАА, Св-12Х2Н2МААВИ ФЦ-16А НФ-18М, КФ-30 15Х2НМФА-А with 15Х2НМФА-А 15Х2НМФА-А with 15Х2НМФА-А - РТ-45АА НФ-18М КФ-30 - Св-12Х2Н2МАА Св-09ХГНМТААВИ - - For argon-arc welding it is allowed to use welding wire Св-08ХМФА when silicon content is not less than 0.22% - - - - - - - - 12Х2МФА, 15Х2МФА, 18Х2МФА among themselves and with15Х2МФА А 15Х2МФА-А with 15Х2МФА-А Н-3, Н-6, Н3АА, ЦЛ-20 Св-10ХМФТ, Св-10ХМФТУ АН-42М, КФ-30 - Св-13Х2МФТ, Св-13Х2МФТА ОФ-6 - - Св-10ХМФТУ АН-42М, КФ-30 - Св-13Х2МФТА ОФ-6 - Table 2. Welding materials to fabricate welded joints of parts made of high-chromium steels with parts made of high-chromium steels and perlitic steels (except for welded joints of Categories Iн and IIн) Steel grades of parts being welded 08Х13 with 08Х13 and with 06Х12Н3Д (06Х12Н3ДЛ), 1Х12В2МФ 06Х12Н3Д (06Х12Н3ДЛ) with 06Х12Н3Д (06Х12Н3ДЛ) and with 10ГН2МФА, 10ГН2МФАЛ 1Х12В2МФ with 1Х12В2МФ 08Х14МФ with 08Х14МФ 08Х14МФ with steels 20 and 22К 05Х12Н2М with 05Х12Н2М 07Х16Н4Б with 07Х16Н4Б • Grades of welding materials in use Coated welding elecFor automated hidden arc welding trodes for manual arc wire fluxing agent welding УОНИИ/10Х13 Св-06Х14 АН-22 ЦЛ-51 Св-01Х12Н2-ВИ ОФ-6 ЦЛ-51 Св-01Х12Н2-ВИ* ОФ-6 ФЦ-19 ЦЛ-32 ЦЛ-51 ЦТ-45 ЦТ-45 ЦЛ-51 Св-14Х12НВМФ Св-01Х12Н2-ВИ АН-17М ОФ-6 ФЦ-19 ОФ-6 Св-01Х12Н2-ВИ* - - - Welding wire for argon-arc welding (including for gas shielded welding) Св-06Х14 Св-01Х12Н2-ВИ Св-01Х12Н2МТ-ВИ Св-01Х12Н2-ВИ Св-10Х11НВМФ Св-01Х12Н2-ВИ Св-03Х20Н45Г6М6Б-ВИ Св=01Х12Н2-ВИ Св-03Х20Н45Г6М6Б-ВИ Св-01Х12Н2МТ-ВИ Св-09Х16Н4Б With preliminary overlaying except for parts made of steel grades 10ГН2МФА, 10ГН2МФАЛ, 20 and 22К with welding electrodes ЦЛ-51. Table 3 Welding materials to fabricate welded joints of parts made of austenitic steels (except for welded joints of Categories Iн and IIн) Steel grades of parts being welded 10Х18Н9ТЛ 12Х18Н9Т 12Х18Н9ТЛ 06Х18Н1ОТ 08Х18Н1ОТ 12Х18Н1ОТ 08Х18Н12Т 12Х18Н12Т 10Х17Н13М2Т (in any combination) 03Х21Н32МЗБ with 03Х21Н32МЗБ and with 12Х18Н9 12Х18Н9Т 08Х18Н1ОТ 12Х18Н1ОТ 08Х18Н12Т 10Х17Н13М3Т Coated welding electrodes for manual arc welding ЭА-400/10У ЭА-400/10Т ЦТ-15К ЦТ-26 ЦТ-26М ЭА-898/21Б ЭА-902/14 ЭА-855/51 Grades of welding materials in use For automated hidden arc welding Welding wire for argon-arc welding Wire Fluxing agent (including gas shielded welding) Св-04Х19Н11М3 ОФ-6 ФЦ-17 Св-04Х19Н11М3 Св-08Х19Н10МЗБ ОФ-6 Св-08Х19Н10Г2Б Св-04Х20Н10Г2Б ОФ-6 Св-08Х19Н10Г2Б Св-04Х20Н10Г2Б Св03Х15Н3517М6Б ОФ-6 Св03Х15Н35Г7М6Б For electroslag welding Wire Fluxing agent Св04Х19Н11М3 (wire) Св-06Х19Н9Т (wire) 08Х18Н1ОТ (plate) - ОФ-6 ОФ-6 ОФ-6 - 10Х18Н12МЗТЛ 08Х18Н10Т, 12Х18Н10Т with 10Х16Н36М3ТЮБР - - - Св30Х15Н35В3БЗТ - N o t e . In case of hidden arc welding of parts made of steel grade 08Х18Н10Т with the use of welding wire Св-04Х19Н11М3 intended for operation at temperature below 200°С, it is permitted to use fluxing agent АН-26 or АН-26С provided each batch of welding wire is preliminary checked along with each batch of fluxing agent whether the welded joints specially fabricated with the use of these materials have cracks in the root metal; the welded joints are tested using radiographic and metallographic techniques. - Table 4 Welding materials to fabricate welded joints of parts made of austenitic steels with parts made of perlitic and high-chromium steels (except for welded joints of Categories Iн and IIн) Characteristics of parts be- Grades of welding materials for preliminary overlaying of edges ing welded of parts made of perlitic and high-chromium steels Materials Nominal part Coated thickness in welding welding loca- electrodes tion, mm for manual arc overlaying Austenitic Up to 10 (insteels with clusive) carbon steels or manganese-silicon steels - For automated hidden arc overlaying Tape or wire Flux. agent - - Independently ЭА-395/9, Св-10Х16Н25АМ6 of thickness ЦТ-10 ОФ10 Welding wire for argon-arc welding - Св-10Х16Н25АМ6 Grades of welding materials to fabricate weld Coated welding electrodes for manual arc welding For automated hidden arc welding Wire Welding wire for argon-arc welding Flux. agent ЭА-395/9 ЦТ-10 СВ-10Х16Н25АМ6 ОФ-6 Св-10Х16Н25АМ6 ЗИО-8 ЦЛ-25/1 ЦЛ-25/2 Св-07Х25Н13 ОФ-6 СВ-07Х25Н13 ЭА-855/51 СвОЗХ15Н35Г7М6Б ОФ-6 СвОЗХ15Н35Г7М6Б ОФ-6 Св-04Х19Н11МЗ ЭА-400/10У Св-04Х19Н11МЗ ЭА-400/10Т ЦТ-26 ЦТ26М ЭА-855/51 Св-ОЗХ15Н3517М6Б СВОФ-6 ОЗХ1БН35Г7М6Б First layer ЭА-395/9 Св-10Х16Н25АМ6 ОФЦТ-10 10 ЭА400/10У, ЭА 400/10Т, ЦТ-26, ЦТ-26М Austenitic steels with alloyed steels or highchromium steels Up to 6 (inclusive) - Св-10Х16Н25АМ6 Second and subsequent layers Св-04Х19Н11М3 ОФ- Св-04Х19Н11МЗ 10 ФЦ18 (tape) ОФ10 ФЦ17 (wire) - - Independently First layer of thickness ЭА-395/9* Св-10Х16Н25АМ6* ОФЦТ-10* 10 - Св-10X16Н25АМ6* Second and subsequent layers ЭА-855/51 СвОЗХ15Н35Г7М6Б ЭА-400/10У Св-04Х19Н11МЗ ЭА-400/10Т ЦТ-26 ЦТ26М ОФ-6 СвОЗХ15Н35Г7М6Б ОФ-6 Св-04Х19Н11МЗ ФЦ-17 ОФ-6 ЭА-898/21Б СВ-04Х20Н10Г2Б ЦТ-15К Св-08Х19Н10Г2Б СВ-04Х20Н10Г2Б Св-08Х19Н10Г2Б ЭА-395/9* ЦТ-10* СВ-11Х16Н25АМ6* ОФ-6 Св-10X16Н25АМ6к ЭА-855/51 Св0ЗХ15Н35Г7М6Б Св0ЗХ15Н35Г7М6Б ОФ-6 ЭА-400/10У Св-04Х19Н11МЗ ЭА-400/10Т ЦТ-26, ЦТ-26М ОФ-6 Св-04Х19Н11МЗ ФЦ-17 ЭА-898/21Б Св-04Х20Н10Г2Б ЦТ-15К Св-08Х19Н10Г2Б ОФ-6 Св-04Х20Н10Г2Б Св-08Х19Н10Г2Б ЭАСв-04Х19Н11МЗ 400/10У ЭА400/10Т ЦТ-26 ЦТ26М ОФ- Св-04Х19Н11МЗ 10 ФЦ18 (tape) ОФ-6 ФЦ17 First and subsequent layers ЭА-855/51 Св-0ЗХ15Н35Г7М6Б ОФ-6 СвОЗХ15Н35Г7М6Б ЭА-855/51 Св0ЗХ15Н35Г7М6Б ОФ-6 Св0ЗХ15Н35Г7М6Б Notes to Table 4 Notes: 1. The welding materials which are used only for welding and overlaying niobium non-containing steels are marked with an asterisk. 2. Heat treatment of welded joints with welds fabricated using niobium 3. 4. 5. 6. non-containing welding materials is not permitted. While making angle and tee- welding joints with the design angle weld height of up to 10 mm inclusive when the parts made of austenitic steels are welded to these of carbon and manganese-silicon steels of any thickness and up to 6 mm inclusive when the parts made of austenitic steels are welded to these of alloyed and highchromium steels, the necessity of preliminary edge overlaying is determined by the design documentation and PED requirements. Automated hidden arc overlaying and welding using welding wire Св07Х25Н13 and Св-10Х16Н25АМ6 and automated hidden arc overlaying using welding wire Св-04Х19Н11МЗ are permitted as agreed with the leading material study organization. In case of combined welding techniques the welding materials should be used, which are indicated in the same line of the Table (separated by horizontal lines). In case of manual coated electrode arc welding using welding electrodes ЭА-855/51 or argon-arc welding using welding wire СвОЗХ15Н35Г7М6Б it is allowed not to preliminary overlay edges of parts made of perlitic and high-chromium steels if the parts with overlaid edges are not subject to heat treatment in accordance with the requirements of these BP. 7. The welding of austenitic steels with parts made of perlitic and highchromium steels using filler materials non-containing niobium is permitted only in cases of forced heat treatment of the welded joint of these steels provided the PED for such welding is agreed upon with the interagency leading material study organization. Table 5 Welding (overlaying) materials for overlaying of corrosion resistant coating on parts (items) made of perlitic steels Characteristics of coating being overlaid Overlaid layers By type By number of overlaid layers 1 Uniform For automated hidden arc overlaying Tape or wire 2 Singlelayer 3 4 5 Нп-0ЗХ22Н11Г2Б ФЦ-18 (tape), ФЦСв-0ЗХ241113Г2Б 17 (wire)* ОФ-10, ФЦ-18 (tape), ОФ-6 (wire) * ОФ-10 First СВ0ЗХ15Н35Г7М6Б Св-07Х25Н13 Second Св-04Х20Н10Г2Б All Two-layer Fluxing agents Св-07Х25Н13 Multi-layer All Double Grades of welding (overlaying) materials ОФ-10, ФЦ-18 (tape) ОФ-10, ФЦ-18 (tape) ОФ-6, ФЦ-17 (wire)** Coated welding electrodes for manual arc overlaying Note Welding wire for argon-arc overlaying 6 ЭА-855/51 7 8 СВ-0ЗХ15Н35Г7М6Б Permitted only for overlaying of parts made of steel grades 20, 20К, 22К ЦЛ-25/1, ЗИО-8** Св-07Х25Н13 (first layer) ЗИО8, ЦЛ-25/2 (second layer and subsequent layЭА-855/51 СВ-0ЗХ15Н35Г7М6Б ЦЛ-25/1 ЗИО-8** ЭА-898/21Б ЦТ-15К Св-07Х25Н13 - Св-04Х20Н10Г2Б - Multi-layer First Св-07Х25Н13 Secon Св-04Х20Н10Г2Б and sub- Св-08Х19Н10Г2Б sequent ОФ-10, ФЦ-18 (tape) ОФ-6 (wire)* ЦЛ-25/1 ЗИО-8** ОФ-10, ФЦ-18 ЭА-898/21Б (tape) ОФ-6, ФЦ-17 ЦТ-15К (wire)** Св-07Х25Н13 There should be not less than two layers made with wire Св08Х19Н10Г2Б and electrodes ЭА-898/21Б, ЦТ15К Св-04Х20Н10Г2Б Св-08Х19Н10Г2Б N o t e s : 1. The welding materials, which are permitted for use only upon agreement with the leading material study organization, are marked with an asterisk. 2. The welding electrodes which batches are permitted for use provided the content of the ferritic phase in the overlaid metal is not less than 4% are marked with two asterisks. 3. Subject to the agreement by the leading material study organization it is permitted to use welding wire Нп-03Х22Н11Г2Б and Св-03Х24Н13Г2Б in combination with fluxing agent ФЦ-18 to fabricate the first layer of coating. 4. Heat treatment of overlaid corrosion resistant coating having the first layer made with niobium non-containing filler materials is not permitted. 5. In case of a single-layer coating it is permitted to use welding electrodes ЭА-855/51 and welding wire СВ-0ЗХ15Н35Г7М6Б only to eliminate defects in the layer. Table 6 Welding materials to fabricate welded joints of Categories Iн and IIн of parts made of perlitic and high-chromium steels Grades of welding materials in use Maximum permissible temperature in use, Steel grades of parts Coated welding For automated hidden arc weld- Welding wire for ar0 С electrodes for ing gon-arc welding (inbeing welded manual arc cluding gas shielded wire flux. agent welding welding) СтЗсп5, 10, 15, 20, 22К УОНИИ-1З/45* Св-08А* ОСЦ-45* Св-08ГС 350 in any combination УОНИИАН-348А* Св-08Г2С Св-08АА* 13/45А* КФ-27 Св-10Г2 УОНИИ-13/55 12Х1МФ, 15Х1МФ Н-6 Св-08ХМФА КФ-16 Св-08ХМФА 550 in any combination 05Х12Н2М с ЭМ-959/52 Св-01Х12Н2МТ- КФ-28 Св-01Х12Н2МТ-ВИ 550 05Х12Н2М ВИ 10Х2М с 10Х2М Н-10 Св-04Х2МА КФ-16 Св-04Х2МА 510 Notes: 1. The welding materials permitted for use where the nominal thickness of parts being welded is not more than 60 mm are marked with an asterisk. 2. Subject to agreement with the leading material study organization it is permitted to carry out: manual arc welding of parts made of carbon steels using welding electrodes ТМУ-21У; automated hidden arc welding of parts made of steel grade 22К using welding wire Св-08ГС in combination with fluxing agent ФЦ-16. Table 7 Welding materials to fabricate welded joints of Categories Iн and IIн of parts made of austenitic steels Steel grades of parts being welded 08Х18Н9. 08Х18Н10, 08Х18Н10Т, 12Х18Н10Т, 10Х18Н12МЗТ in any 10Х18Н9, 12Х18Н9, 08Х16Н11МЗ in any combination 0ЗХ16Н9М2 with 0ЗХ16Н9М2 08Х16Н11МЗ with 08Х16Н11МЗ 09Х18Н9, 08Х18Н10 in any combination 0ЗХ16Н9М2 with 0ЗХ16Н9М2 Grades of welding materials in use Coated For automated hidden arc Welding wire for arwelding welding gon-arc welding (inelectrodes cluding gas shielded wire flux. for manual welding) agent arc weldА-1, А-1Т Св-04Х17Н10М2 ОФ-6 Св-04Х17Н10М2 А-2, А-2Т Св-02Х17Н10М2- ОФ-6 Св-02Х17Н10М2-ВИ ВИ А-1, А-1Т Св-04Х17НЮМ2 ОФ-6 ЦТ-26 ЦТ-26М ОФ-6, Св-0ЗХ16Н9М2 ФЦ-17 Св-ОЗХ16Н9М2 Св-04Х17Н10М2 - - - - - - - - - - - - For electroslag welding wire fluxing agent - - - - - - Св-04Х17Н10М2 ОФ-6 (wire) Св-04Х19Н11МЗ ОФ-6 (wire) 12Х18Н9 (plate) Св-0ЗХ16Н9М2 (wire) ФЦ-17 Maximum permissible temperature in use, oC 600 600 (дfor welding of parts made of steel grade 12Х18Н9-450) 600 550 550 550 12Х18Н10Т, 08Х18Н10Т with 10Х15Н36ВЗТ-ВД ЭА-855/51 ЭА-582/23 - - Св-0ЗХ15Н35Г7М6Б - - 550 Table 8 Welding materials to fabricate welded joints of Categories Iн and IIн of parts made of austenitic steels with parts made of perlitic and high-chromium steels Characteristics of parts being welded Steel grade 08Х16Н11МЗ, 08Х18Н10 or 08Х18Н10Т with ВСт3сп5, 10, 15, 20 or 22К in any combination Nominal part thickness in welding location, mm Up to 10 (inclusive) over 10 Grades of welding materials for preliminary overlaying of edges of parts made of perlitic and high-chromium steels Coated welding electrodes for manual arc overlaying - ЭА-395/9 08Х16Н11М3, Up to 6 (inclu09Х18Н9, sive) 08Х19Н10 or 08Х18Н10Т with КГИ-7 12МХ, 12ХМ, 15ХМ, Over 6 ЭА-395/9* 10Х2М, 12Х1МФ, 15Х1МФ or 08Х13 Grades of welding materials for fabrication of weld Welding wire for argon- Coated welding elecarc overlaying trodes for manual arc welding - ЭА-395/9 All layers Св-10Х16Н25АМ6 ЭА-400/10У ЭА-100/10Т ЭА-З95/9* КТИ-7 ЭА-395/9 First layer Св-З0Х15Н35ВЗБЗТ Св-10Х1бН25АМ6* Second and subsequent layers Welding wire for argon-arc welding Св-10Х16Н25АМ6 Св-04Х19Н11МЗ Св-10Х16Н25АМ6 Св-ЗОХ15Н35ВЗБЗТ Св-10Х16Н25АМ6 А-1, А-1Т А-2, А-2Т ЭА-400/10У* ЭА-400/10Т** 08Х16Н11МЗ, Up to 6 (inclu09Х18Н9, sive) 08Х18Н10 with 12Х1МФ, 15Х1МФ, over 6 ЭА-395/9* 10Х2М Св-04Х17Н10М2 Св-02Х17Н10М2-ВИ Св-04ХГ9Н11МЗ** А-1, А-1Т А-2, А-2Т ЭА-400/10У** ЭА-400/10Т** ЭА-395/9X КТИ-7 First layer Св-10X16Н25АМ6к Св-З0Х15Н35ВЗБЗТ Second and subsequent layers А-1, А-1Т, А-2, А- Св-04Х17Н10М2 2Т Св-02Х17Н10М2-ВИ ЭА-400/10У* ЭА-400/10Т* 08Х18Н10Т with 08Х14МФ Independently of thickness _____________________________ *Only for temperatures not more than 500°С. ** Only for temperatures not more than 450°С. Св-04Х19Н11МЗ* Св-04Х19Н10М2 Св-02Х17Н10М2-ВИ Св-04Х19Н11МЗ Св-10Х16Н25Ам6 Св-З0Х15Н35ВЗБЗТ А-1, А-1Т ЭА-400710У** ЭА-400/10Т** А-2, А-2Т Св-04Х19Н10М2 Св-02Х17Н10М2-ВИ Св-04Х9Н11МЗ** ЦТ-45 СВ-З0Х20Н45Г6М6Б-ВИ Table 9 Welding materials used for welding of the weld roots of parts made of steel grades 15Х2МФА-А or 15Х2НМФА-А Steel grades of parts being welded Grades of welding materials For automated hidden arc welding Wire Св-08АА-ВИ 1БХ2МФА-А with 15Х2МФА-А 15Х2НМФА-А with Св-0ЗАА-ВИ 15Х2НМФА-А Coated welding electrodes for manual arc welding Flux.agent АН-42М УОНИИ-13/45АА ФЦ-16А АН-42М ЦУ-7А УОНИИ-13/45АА It is allowed to include in one batch the fluxing agent of one grade from several melts provided all mass of fluxing agent batch is homogeneously mixed-up (as a whole or in proportional amounts) 2.11. It is allowed to consider shielding gas of one name, one kind, one brand (group) supplied according to one and the same standard or under one and the same specifications as a shielding gas batch. 2.12. Welding wire and filler tape should be stored under the conditions preventing their soiling, corrosion and damage. 2.13. Coated welding electrodes and fluxing agents after tempering should be stored in closed sacks made of waterproof fabric (polyethylene film) or in closed tare under rubber-sealed lid or in drying boxes at temperature of 80±20°С or in storage rooms at temperature not less than 15°С and relative air humidity not more than 50%. 2.14. In case of storage, after tempering (initial or repeated), in a package or in drying boxes as per Subsection 2.13, the shelf life of coated welding electrodes and fluxing agents and their service life without humidity check and additional tempering are not limited. 2.15. In case of storage, after tempering, in the storage rooms as per Subsection 2.13 the coated welding electrodes and fluxing agents may be used without humidity check and re-tempering within the timelines indicated in PED. In this case the established timelines should not exceed: • for welding electrodes with basic coating and designed for welding of perlitic and high-chromium steels – 5 days; • for other welding electrodes - 15 days.; • for fluxing agents OФ-6 and OФ-10 - 3 days; • for other fluxing agents - 15 days. 2.16. In case the welding electrodes and fluxing agents storage conditions under Subsection 2.13 are violated or the timelines indicated in Subsection 2.15 expire the welding electrodes and fluxing agents before use are subject to humidity check and re-tempering. 2.17. In any cases where during the check the humidity value in coated electrodes or in a fluxing agent exceeds values established by standards or specifications for the welding materials being checked, they should be subjected to re-tempering 2.18. Tempering quality of each setting of welding electrodes H-10, fluxing agents KФ-I6 and КФ-27, as well as welding electrodes УОНИИ13/45А and УОНИИ-13/55 to be used for welding of parts made of steel grade 10X2M among themselves and with parts made of perlitic steels, is determined by hydrogen content in the overlaid metal or weld metal in accordance with the methodology of the leading interagency material study organization. At this, the hydrogen content in the overlaid metal (weld metal) in case of manual arc welding should not exceed 2.5 cm3 per 100 g, and in case of automated hidden arc welding it should not exceed 3.0 cm3 per 100 g. Should the results be negative the re-tampering of welding electrodes and fluxing agents is done followed by the determining of hydrogen content. It is allowed, upon agreement with the leading interagency material study organization, to skip the determining of hydrogen content in the overlaid metal when individual batches of welding materials designated for welding of specific parts are checked. 2.19. If a batch of welding electrodes or fluxing agents was tempered in parts in different time, the requirements of Subsections 2.14-1.17 relate to each individual part. 2.20. Tempering modes of welding electrodes and fluxing agents before use should correspond to the modes established in standards or specifications for the welding materials of specific grades. If the standards or specifications do not contain instructions regarding tempering temperature and hold-up time, before using the welding electrodes and fluxing agents, one should be guided by the instructions given in Table 10. 2.21. It is allowed to carry out tempering of welding electrodes not more than three times and the fluxing agents ОФ-6 and OФ-10 – not more than five times (not count in the tempering during fabrication). Number of tempering for other fluxing agents is not limited. 2.22. The date and modes of each tempering operation should be entered in a special log. It is allowed to indicate such data on labels or under marking on a package. 2.23. The tempered electrodes and fluxing agents should be transported to the welding stations in a closed tare (rubber-sealed tare, waterproof paper bags or polyethylene sacks). 2.24. The welding electrodes should be given to welders in the amount necessary for one-shift assignment unless the PED establishes more rigid requirements. During the issue procedure the welding electrode grade should be checked by tags, welding electrode edge identification color or coating color. Austenitic welding electrodes and wire should be checked by a magnet. 2.25. A procedure for accounting, storage, issue and return of the welding materials is established by an instruction to be developed by the enterprise carrying out welding (overlaying). Table 10 Recommended tempering modes for coated welding electrodes and fluxing agents Name of welding materials Grade of welding materials Tempering temperature, °С Coated welding УОНИИ-13/45А 400±20 electrodes УОНИИ-13/55 , 465 ±15* Н-3,Н-6,Н-10,Н-23,Н-25,Н-20,РТ-45Б 465 ±15* Fluxing agents УОНИИ-13/45, УОНИИ-13/10Х13 ТМЛ1-1У, ТМЛ-3У, ТМУ-21У ОЗС-6, МР-3, ОЗС-4, АНО-4 ЭА-400/10У, ЭА-400/10Т, ЭА-898/21Б, ЭА-902/14 ЭМ-959/52 А-1, А-2, А-1Т, А-2Т ЭА-395/9, ЗИО-8 ЭА-855/51 ЦУ-5, ЦУ-6, ЦУ-7, ЦУ-7А, ЦУ-2ХМ, ПТ-30, ЦЛ-20, ЦЛ-21, ЦЛ-32, ЦЛ-38, ЦЛ-39, ЦЛ-45, ЦЛ-48, ЦЛ-51, ЦЛ-52, ЦЛ-59,РТ-45А, РТ-45АА ЦЛ-25/1, ЦЛ-25/2, ЦТ-10, ЦТ-15К, ЦТ-24, ЦТ-26, ЦТ-26М, ЦТ-45 АН-348А, АН-8, АН-348АМ АН-42, АН-42М, АН-26, АН-26С КФ-16, КФ-19, КФ-27, КФ-30, НФ-28М ОФ-6 ОФ-10 ОСЦ-45 ФЦ-11 ФЦ-16,ФЦ-16А ФЦ-17, ФЦ-19, ФЦ-21, -22 ФЦ-18 Hold-up time, h 3.0+0.5 3.0+0.5 3.0+0.5 400±20 400±20 200±20 135±15 2.5+0.5 2.0+0.5 2.0+0.5 2.0+0.5 465±15 135±15 225±25 360±20 360±20 5.0+0.5 2.0+0.5 2.0+0.5 2.0+0.5 2.0+0.5 330±120 1.5+0.5 350±50 б50±20 725±25 4.5+0.5 4.0+0.5 3.0+0.5 905±25 960±10 375±25 375±20 620±20 5+0.5 5+0.5 2+0.5 4+0.5 4+0.5 650±20 800±20 4+0.5 3+0.5 ______________ *It is permitted to reduce the tempering temperature down to 400+20 0С, as agreed upon with the leading interagency material study organization. 2.26. The tempering of fluxing agents should be done in electric furnaces on trays made of heat-resistant steels. 2.27. The tempering modes of fluxing agents should be monitored using thermocouples installed directly in the fluxing agent layer. During tempering the layer thickness of fluxing agents ОФ-6 and ОФ-10 should not exceed 100 mm, and in case other fluxing agents it should be established in the PED. It is allowed to monitor the tempering mode of fluxing agents using furnace (dome) thermocouples provided their have been properly calibrated against the thermocouples installed in the fluxing agent. 3. Requirements to Welding Equipment 3.1. The welding and overlaying should be done using only workable, complete and adjusted installations, hardware and tools which ensure meeting all requirements of these BP, RFI and PED as well as the monitoring of the preset modes. 3.2. The direct current stations should be used for manual welding (overlaying). It is permitted to use alternating current stations for manual arc welding (overlaying) with rutile-coated welding electrodes. 3.3. Each automated argon-arc welding (overlaying) station should be connected to an independent welding current supply source. 3.4. The argon-arc welding (overlaying) equipment should provide for a possibility for smooth arc extinction. In case of manual argon-arc welding it is permitted to extinct arc by switching off welding current or by slow removal of the torch from the product. 3.5. The welding equipment for automated arc and electroslag welding (overlaying) should be furnished with a voltmeter, ammeter and devices which ensure preset welding speed, and the equipment for manual arc welding (overlaying) should be furnished with an ammeter. It is allowed to use portable ammeters for periodic monitoring of welding current value. 4. Requirements to Personnel 4.1. Welding, overlaying and tacking of parts and assembly units should be done by welders who passed qualification tests for performing welding operations in accordance with the requirements of the Rules for Qualification of Welders of Equipment and Piping of Nuclear Power Installations (PNAE G-7-003-87) of Gosatomenergonadzor (hereinafter referred to as “Rules for Qualification of Welders”) and who have Welder’s Certificates issued according to the established format. At this, the welders are permitted to perform corresponding welding (overlaying) operations which are indicated in their certificates. Besides, each welder should be given a personal stamp, which is to be registered in the TCU log or in the registration log of other controlling authority. 4.2. Welding, heating and heat treatment of welded joints and overlaid parts (items) should be carried out by employees who have done training and passed qualification tests. The scope of training, test procedures and frequency of re-testing are determined by the enterprise conducting corresponding operations. 4.3. The engineers, who lead assembling, welding, overlaying, heating and heat treatment operations, should be qualified in accordance with the “Unified Provisions for Testing of Knowledge of Heads and Specialists of Gosatomenergonadzor of the USSR in Regulations, Standards and Instructions of Safe Conduct of Operations in Nuclear Power”. 5. Preparing and Assembling of Parts for Welding (Overlaying) 5.1. General requirements 5.1.1. The parts (assembly units) should be prepared and assembled for welding (overlaying) in accordance with the PED developed pursuant the requirements and guidelines of these BP and drawings. 5.1.2. The PED for assembling should indicate: • the tools and equipment used for assembling; • assembling procedure and sequence; • way of fixing the parts; • welding techniques, materials and modes for tack welding and welding of temporary engineered fixtures; • dimensions, number and locations of tack welds; • number of temporary engineered fixtures, their locations and sizes of welds where they are welded to the product; • inspection techniques of the assembling quality; • other necessary data to list all engineering and control operations. 5.1.3. It is allowed to incorporate the PED for assembling and the relevant PED for welding (overlaying). 5.2. Preparation for welding (overlaying). 5.2.1. The edges and surfaces of parts should be prepared for welding by machining. 5.2.2. It is permitted to prepare edges of parts made of perlitic carbon and manganese-silicon steels using oxygen, air-arc or plasma-arc cutting followed by machining (grinding, etc.) to remove traces of cutting. 5.2.3. Oxygen, air-arc and plasma-arc cutting may be permitted for preparing of edges of parts made of perlitic alloyed steels only as a preliminary operation followed by mechanical removal of not less 1 mm thickness metal layer in case of alloyed steels with the guaranteed yield stress of up to 315 MPa at temperature 20°С inclusive; and not less than 2 mm in case parts made of steels with the guaranteed yield stress of more than 315 MPa. In doing so, in necessary cases to prevent crack formation the cutting is done with preliminary heating of metal in accordance with the PED guidelines. 5.2.4. It is permitted to prepare the edges of parts made of austenitic steels using plasma-arc or powder-flame cutting followed by removal of not less than 1 mm layer of metal by machining. 5.2.5. The shape and structural elements of part edges prepared for welding should correspond with the requirements of these BP or drawing. 5.2.6. When preparing for butt joining of parts with different nominal thickness a smooth transition (bevel) should be made on the thicker parts as per the requirements of NPI Rules. 5.2.7. When preparing the tubes of the same nominal diameter and nominal wall thickness for butt welded joints having one-side grooving the tube ends should be calibrated (bored or expanded) to achieve the given inner diameter (see Subsection 12.11). 5.2.8. The edges (surfaces for overlaying) and adjacent sections of parts prepared for welding should be cleaned from dross, rust, paint, oil and other surface soiling. The width of the above sections should be not less than 20 mm in cases where the parts are prepared for arc welding (overlaying) and not less than 50 mm in cases where parts are prepared for electroslag welding. 5.3. Assembling. 5.3.1. All parts received for assembling and assembly units should be marked and/or supplied with documentation to confirm that they have been accepted by the Technical Control Service. The type of marking is determined by the PED or the manufacturing enterprise (assembling organization). 5.3.2. The assembling of tubes and other cylindrical or conical parts to make annular butt welds should be done in accordance with the PED requirements and using the welding equipment or assembling and welding equipment and tooling which ensure concentricity of the parts (assembly units) being assembled. 5.3.3. It is allowed to use arc coated electrode welding or argon-arc welding to fabricate tack welds and welding of temporary engineered fixtures. While assembling parts for argon-arc or electron-beam welding (including argon-arc welding of the weld root) the tack welds should be made by argon-arc welding. 5.3.4. The tack welds should be made by welders who have permits to fabricate joints requiring tacking. 5.3.5. To make tack welds the welding materials indicated in Subsection 2.4 should be used. 5.3.6. Defective tack welds should be removed by machining (grinding, etc.). In cases described in the PED regarding joints of parts made of perlitic steels it is allowed to remove the defective tack welds by arc-air gouging. 5.3.7. It is not permitted to tack the locations of crossing or coupling of two or several joints to be welded. 5.3.8. Welding of temporary engineered fixtures is permitted only in cases indicated in the drawings or PED. At this, the following should be specified: the steel grade, shape, dimensions, number and locations of the above fixtures, qualification of welders making welding of the fixtures, welding materials, techniques and modes of welding and heating. The use of temporary engineered fixtures while assembling parts made of austenitic steels and iron-nickel alloys is permitted where the nominal thickness of parts is not less than 6 mm. 5.3.9. Tack welding and welding of temporary engineered fixtures while assembling parts made of alloyed and high-chromium steels should be done with heating of metal in the welding zone according to the mode established for a given welded joint except for the cases where the welding is done with the use of austenitic filler materials. During tacking the heating is not mandatory in case of welded joints, which weld root is made by argon-arc welding without heating. 5.3.10. While assembling parts made of perlitic steels and/or highchromium steels the temporary engineered fixtures in use should be made of steel of the same grade that the parts being assembled; and in case assembling of parts made of austenitic steels, iron-nickel alloys and/or two-ply steels (with a fixture to be welded to the clad layer) the fixtures should be made of steel grade 08Х18Н10Т. In cases described in the PED it is allowed to use temporary engineered fixtures made of steels, which are close in chemical composition and mechanical properties to the “indicated steels” as well as to use fixtures made of carbon steels in case of assembling the parts made of austenitic steels and/or two-ply steels. 5.3.11. The following should be used for welding of temporary engineered features to parts (assembly units) made of perlitic steels without corrosion resistant coating: • the same welding materials that are used for tack welds pursuant Subsection 2.4, the base metal heating requirements para. 5.3.9 being met; • coated welding electrodes ЗИО-8, ЦЛ-25/1, ЭА-395/9 or ЦГ-10 or welding wire Св-10Х16Н25АМ6 or Св-07Х25Н13 without heating of the base metal. 5.3.12. The following should be used for welding of temporary engineered fixtures to parts (assembly units) made of high-chromium steels: • coated welding electrodes or welding wire permitted for fabrication of welded joints of parts made of corresponding steel grade or coated welding electrodes ЦЛ-51 or welding wire Св-01Х12Н2ВИ (two latter filler materials are used independently of the assembled parts’ steel grades) – to weld fixtures made of highchromium steels, the base metal heating requirements of para. 5.3.9 being met; • coated welding electrodes ЭА-395/9, ЦТ-10, ЦЛ-25/1, ЦЛ-25/2, ЗИО-8 or welding wire Св-10Х16Н25АМ6 or Св-07Х25Н13 – to weld fixtures made of carbon and high-chromium steels to niobium non-containing steels without heating of the base metal; • coated welding electrodes ЦЛ-25/1, ЦЛ-25/2, ЗИО-8 or welding wire Св-07Х25Н13 – to weld fixtures made of high-chromium steels to niobium-containing steels without heating. 5.3.13. The following should be used for welding of temporary engineered fixtures to parts (assembly units) made of austenitic steels: • coated welding electrodes and welding wire permitted for fabrication of welded joints of parts made of corresponding steel grades - to weld fixtures made of austenitic steel; • coated welding electrodes ЭА-395/9 and ЦГ-10 or welding wire Св-10Х16Н25М6 – to weld fixtures made of carbon steels. 5.3.14. Coated welding electrodes and welding wire permitted for fabrication of welded joints of parts made of a corresponding steel grade should be used for welding of temporary engineered fixtures to parts made of ironnickel alloys. 5.3.15. Coated welding electrodes or welding wire permitted for fabricating the upper layer of the corresponding corrosion resistant coating should be used for welding of temporary engineered fixtures to the clad layer (corrosion resistant coating) of parts made of two-ply steels. At this, the preliminary two-layer overlay should be fabricated on the edges of fixtures made of carbon steels, the following requirements being met: • in case there is niobium or titanium in the corrosion resistant coating metal the first layer of the overlay should be made with coated welding electrodes ЦЛ-25/1 or ЗИО-8 or with welding wire Св07Х25Н13 and the second layer should be made with welding electrodes ЦТ-15К or ЭА-898/21Б or with welding wire Св04Х20Н10Г2Б or Св-08Х19Н10Г2Б; • if there is no niobium or titanium in the corrosion resistant coating metal, both layers are fabricated with coated welding electrodes ЦЛ-25/1 or ЗИО-8 or with welding wire Св-07Х25Н13. 5.3.16. The surface of parts in the fixture welding locations should be free preliminary cleaned from dross, rust, paint, oil and other soiling. 5.3.17. The welds of temporary engineered fixtures should be located at a distance of not less than 60 mm from the edges subject to welding. It is allowed to reduce this distance down to 30 mm in case of assembling the parts made of carbon and manganese-silicon steels. 5.3.18. Temporary engineered fixtures are removed by machining. At this, in case of parts made of carbon and manganese-silicon steels it is allowed to remove temporary engineered fixtures completely by oxygen or airarc cutting without deepening into the base metal and followed by grinding of parts’ surfaces to remove traces of cutting. It is allowed to partially remove temporary engineered fixtures on parts made of austenitic steels; they are removed by oxygen (powder flame), plasma-arc or air-arc cutting. At this, the remaining part of the fixture should be not less than 4 mm high and is subject to subsequent removal by machining. While removing temporary engineered fixtures it is allowed to partially remove their weld metal. In cases where the temporary engineered fixtures are welded with austenitic filler materials to parts made of perlitic steels and high-chromium steels, as well as in cases where the above materials are used to weld fixtures made of carbon steels to the parts made of austenitic steels, it is allowed to partially remove weld metal on the side which will not be in contact with operating environs, but if the corrosion resistant coating is to be overlaid subsequently, the weld metal is allowed to be partially removed on both sides. 5.3.19. If the gap between would-be welded edges (shoulders) of the assembled parts does not meet the established requirements and the design documentation does not set forth more rigid requirements, it is allowed to perform the following operations: • in case of gap exceeding the established guidelines not more than 0.5 mm of nominal base metal thickness of edges to be welded but not more than 10 mm – the overlaying of edges (one or two) with coated welding electrodes or welding wire (for argonarc overlaying) of grades, which are intended for fabrication of a given welded joint. In case of overlaying only the root sections of the joined parts made of perlitic steels it is allowed to use filler materials used for welding of weld root of the given joint; the overlaying should be done along with heating if such treatment is designed for the welded joint being fabricated; after overlaying the edges are subject to machining to achieve the designed geometry; at this, the parts made of alloyed and high-chromium steels should be preliminary (before machining) heat treated using the inter-tempering mode if the heat treatment of the given welded joint is envisaged by these BP and/or PED; • in case of gaps, which are less than the established values – machining (grinding, undercutting followed by grinding, etc.) of the edges prepared for welding; • in cases where the amount of metal the edges of parts made of carbon and manganese-silicon steels are overlaid with, but not more than 20 cm3, - heating during overlaying and heat treatment may not be done irrespectively of the nominal thickness of parts being assembled. 5.3.20. It is not permitted to increase sizes of parts by overlaying. 5.3.21. The assembling on the remaining backing rings is permitted for tubular joints among themselves or with other cylindrical parts of piping Groups B and C with nominal outer diameter more than 300 mm accessible for welding only on one side in cases where the welding without backing rings is not possible or technically inexpedient due to the design features of the structure. The use of welded joints with backing rings should be agreed upon with the leading material study organization and specified in the design documentation. It is not permitted to use the remaining baking rings with unwelded cross-sectional parting. 5.3.22. The remaining backing rings should be made of the following materials: • for welding of parts made of the same grade of material – the grade of material as the parts being welded; • for welding of parts made of perlitic steels of different grades, as well as for welding of parts made of high-chromium steels of different grades – the less alloyed steel out of the steel grades being combined; • • • for welding of parts made of austenitic steels of different grades, as well as for welding of parts made of austenitic steels with parts made of perlitic steels or high-chromium steels with preliminary overlaying of edges with austenitic filler materials – the steel grade 08Х18Н10Т or the same grade of austenitic steel as one of the parts being welded; for welding of parts made of perlitic steels with parts made of high-chromium steels – the high-chromium steel of the same grade as one of the parts being welded where the welded joint is fabricated with high-chromium filler materials or the austenitic steels (08Х18Н10Т) where the welded joint is fabricated with austenitic filler materials; for welding of parts made of iron-nickel alloys among themselves and with parts made of austenitic steels – the iron-nickel alloys. N o t e . It is allowed to use the remaining backing rings made of carbon steel to fabricate welded joints of parts made of perlitic steels irrespectively of their grade at operating temperature of up to 450°С. 5.3.23. In the butt joints assemble for welding the edge displacement (misalignment of surfaces of parts being joined together) and dulling, gaps between matched edges (shoulders) of parts, as well as between a backing ring and the pipe should meet the requirements of these BP, RFI and drawings. 5.3.24. In the joints assembled for welding the geometric position of parts (bending or perpendicularity of axes, etc.) should correspond to the requirements of the design documentation. It is not permitted to assembly pipes using tightening. The latter requirement does not cover the closing welds fabricated with cold tightening provided the pipes to be welded are rigidly fixed. 5.3.25. After assembling the edges and adjacent surfaces grinded during preparing for welding are subjected to secondary mechanical grinding (as necessary). The grinding should be done by an abrasive wheel or steel brush. The necessity to degrease edges is specified in the PED (with identification of materials used for degreasing). 5.3.26. After the assembling for manual arc coated electrode welding the surfaces of parts made of austenitic and iron-nickel steels adjacent to the edges should be protected from metal spray. At this, the width of protected zone should be not less than 100 mm both sides of the edges prepared for welding. The same protection is recommended in case of welding of temporary engineered fixtures to the surfaces of parts made of austenitic steels. The protection techniques are to be specified in the PED. The requirement of this paragraph is not mandatory if the fabricated welded joints are subject to subsequent machining to remove a metal layer of not less than 0.5 mm thick in the specified zone. 5.3.27. In cases where it is necessary to transport the assembled parts (assembly units) to a welding station the conditions should be arranged for to prevent destruction of tack welds or temporary engineered fixtures welds, as well as deformation, damage to and soiling of parts assembled for welding. 6. Welding 6.1. General Requirements. 6.1.1. Welding of parts (assembly units) should be carried out in accordance with the PED developed pursuant the requirements and guidance of these BP and drawings. The PED should establish: • welding (overlaying) techniques; • qualifications of welders; • types of welded joints to be fabricated; • welding current type and polarity; • welding equipment in use; • combinations of grades of base and welding (overlaying) materials; • necessity, techniques and modes of preliminary and concurrent heating during welding (overlaying); • spatial positions of welding (overlaying); • assortment of filler materials; • welding (overlaying) modes with regard to specific welded joints (overlays); • techniques and modes of preliminary and concurrent heating during welding (overlaying) (if specified); • sequence of beads and weld and overlay layers (as necessary); • types of heat treatment of welded joints and overlaid parts (if such is specified); • keeping conditions of welded joints (overlaid parts) since completion of welding (overlaying) until beginning of heat treatment; • techniques and scope of in-process inspection of welding (overlaying). Exemplary welding modes to fabricate certain welded joints are given in Attachment 2. 6.1.2. The following welding (overlaying) techniques may be used to fabricate welded joints: • automated hidden arc welding (overlaying); • manual arc coated electrode welding (overlaying); • automated, semi-automated and manual argon-arc welding (overlaying); • electroslag welding; • vacuum electron-beam welding; • plasma welding (overlaying); • diffusion welding (only for joining the steel and zirconium fuel channel tubes). The argon-arc welding should mean as argon-shielded welding as the welding under mixtures of argon and helium (at any ratio), with welding car- bonic acid gas of up to 25% (except for welding of austenitic steels and ironnickel alloys), with oxygen of up to 5%. It is permitted to apply carbonic acid gas machine welding with welding wire Св-08Г2С to fabricate welded joints of Category III of parts made of carbon and manganese-silicon steels. 6.1.3. The welding (overlaying) techniques, which are not listed in para. 6.1.2, are permitted for application after relevant qualification tests pursuant NPI Rules, Subsection 3.4. 6.1.4. It is permitted to apply two or several welding (overlaying) techniques out of the list given in para. 6.1.2 to fabricate one welded joint (combined welding). 6.1.5. Welding (overlaying) should be carried out in the conditions, which ensure that the requirements of PED related to protection of welding location from any impacts to welding quality (atmospheric precipitation, etc.) are met. Welding operations to manufacture equipment and assembly parts of piping are not permitted at the ambient air temperature below 0°С. It is allowed to carry out welding in assembling conditions at the ambient air temperature not lower than -15°С. 6.1.6. When the ambient air temperature is below 0°С welding (overlaying) of perlitic steels and high-chromium steels should be carried out with additional or increased heating. In case of welded joints fabricated at the ambient air temperature above 0oC without heating the minimum temperature of preliminary and concurrent heating should be not less than 50°С (additional heating). In case of welded joints fabricated with mandatory heating the minimum heating temperature, pursuant to this Document and PED, should be increased by 50°С (increased heating). It is allowed to weld parts made of austenitic steels and iron-nickel alloys without heating at the ambient air temperature not lower than 5°С. At the lower ambient air temperature the minimum heating temperature should not be below 0°С. 6.1.7. Before welding (overlaying), if necessary, the secondary grinding and degreasing of edges and adjacent surfaces is done. At this, the degreasing is compulsory for all parts made of austenitic steels assembled for welding. In other cases the degreasing necessity is established by the PED. 6.1.8. The grades of welding and overlaying materials in use should correspond to those indicated in Tables 1 through 9 of these BP. 6.1.9. During fabrication of multi-pass welds and overlays, after each bead, the weld and groove surfaces should be thoroughly cleaned from slag, metal spray and visually inspected by welder whether they have cracks, nonpermitted slag (tungsten) inclusions, pores, roughness (undercuts, bulges, pockets between beads) and other defects. The revealed defects should be eliminated before welding is resumed. In case of machine welding the welder’s control over individual beads may be done in the process of welding (without its termination). 6.1.10. All shrink holes (craters) should be thoroughly sealed or brought up into removable envelope of metal or welded cleats. 6.1.11. Welding of angle welds, which are subject to leaktightness requirements as established in drawings should be fabricated not less than in two layers. 6.1.12. In case of two-sided welding (including the fabrication of a backing bead it is permitted to remove partially or completely the root section of the weld before welding on the second side. In case of two-sided welded joint (or single-sided weld with a backing root bead) it is permitted to carry out grooving and welding on one side in sequence followed by grooving and welding on another side. In case of two-sided welding of parts made of austenitic steels and iron-nickel alloys it is recommended to make beads facing the operating environs as the final pass. The necessity to follow this recommendation is determined by the PED. 6.1.13. While making multi-pass welds of welded joints of parts made of austenitic steels and iron-nickel alloys the welding process should be terminated after each pass until the metal cools down to not higher than 100°С in the welding zone. When the austenitic filler materials with specified ferritic phase content are used it is permitted to increase the above temperature limit up to 250°С. The temperature measurement points are established in the PED. 6.1.14. When welding is completed the weld surface and adjacent base metal zone should be cleaned from slag and metal spray at the width necessary for follow-up inspection. 6.1.15. Manual arc welding (overlaying) carried out with welding electrodes which cores are made of austenitic steels should be done in narrow beads with width of not more than three diameters of the welding electrodes in use. 6.1.16. The weld roots of welded joints of parts made of steel grade 08Х18Н12Т, as well as pipes made of carbon steels with nominal wall thickness of 12 mm are recommended to fabricate using a filler wire. 6.2. Heating during welding (overlaying). 6.2.1. The necessity and minimum temperature of preliminary and concurrent heating of parts during welding of parts (assembly units) made of perlitic and high-chromium steels depending of a steel grade and thickness of parts being welded are established according to Table 11. In specific cases the PED may clarify (correct) the requirements of this Subsection as regards heating temperature and thickness of parts being welded for which the heating is required. In cases not covered by Table 11 the necessity and minimum heating temperature are established by the PED (as agreed upon with the leading material study organization). The heating is not done (except for the cases indicated in the PED) during welding and overlaying (including reinforcing overlaying) of parts made of austenitic steels and iron-nickel alloys. 6.2.2. The maximum heating temperature should not exceed the established minimum one more than 150°С. 6.2.3. When the parts made of different steel grades (out of the listed in Table 11) are welded the minimum heating temperature is assumed with regard to the steel for which the heating at higher temperature is envisaged. 6.2.4. The parts of different nominal thickness are welded the minimum heating temperature is established in the PED, and if there are no such guidelines in the PED it is selected as in Table 11 basing on the nominal thickness of the thicker part. 6.2.5. In cases where the parts made of steel grades 12Х2МФА, 15Х2МФА, 15Х2МФА-А and 18Х2МФА are overlaid with perlitic filler materials the minimum heating temperature values for overlaying of the first layer should not be less than 200°С and not less than 150°С for subsequent layers. 6.2.6. Upon agreement with the leading material study organization, in case of combined welding of pipes requiring heating the argon arc welding of weld root is permitted to carry out without heating irrespectively of the pipe steel grades and thickness. 6.2.7. In case of preliminary overlaying of part edges made of perlitic and high-chromium steels with austenitic filler materials the heating is done only for overlaying of the first layer. The necessity and minimum heating temperature are established pursuant Table 11 (as for the welding of parts being overlaid). Table 11 Minimum preliminary and concurrent heating temperature during welding Minimum heating temperature, °С Steel grades of Nominal thick- For arc weld- For electroslag For overlaying parts being ness of parts ing welding of edges with welded being welded, austenitic filler mm materials Ст3сп5, 10, 15, 15Л, 20, 20Л, 20К 22К, 25Л Up to 100 (inclusive) Over 100 Up to 60 (inclusive) Over 60 Up to 40 (inclusive) 10ХСНД Over 40 10ХН1М Up to 40 (inclusive) Over 40 15ГС, 16ГС, Up to 30 09Г2С, 20ГСЛ, (inclusive) 16ГНМА Over 30 10ГН2МФА. Up to 50 10ГН2МФА, (inclusive) 15ГНМФА Over 50 - - - 100 Heating is not required* 100 Heating is not required 100 Heating is not required 100 Heating is not required 150 50 - - - - - - - 50 - - 150 - 120 100** 100 12МХ, 12ХМ 15ХМ 20ХМ, 20ХМЛ, 20ХМА 10Х2М 12Х1МФ 15Х1М1Ф. 15Х1М1ФЛ 15Х2НМФА, 15Х2НМФА-А, 15ХЗНМФА 15ХЗНМФ-А 12Х2МФА 15Х2МФА, 15Х2МФА-А, 18Х2МФА 08Х13, 05Х12Н2М Up to 10 (inclusive) Over 10 up to 30 (inclusive) Over 30 Up to 6 (inclusive) Over 6 Up to 6 (inclusive) Over 6 Up to 6 (inclusive) Over 6 up to 30 (inclusive) Over 30 Up to 6 (inclusive) Over 6 up to 30 (inclusive) Over 30 Irrespectively of thickness The same Heating is not required 150 - - 50 100 200 100 150 - - - 200 - 100 - 150 - 100 - - 100 - 200 150 100 250 - 200 - 150 - 250 200 150 300 150 250 150 200 150 150 150 150 Up to 80 (inclusive) Over 80 Irrespectively of thickness 200 100 150 200 200 150 150 150 150 Up to 6 (inclusive) Over 6 100 100 06Х12НЗД Up to 30 (inclusive) Over 30 100 100 12Х11В2МФ Up to 30 250 150 250 (inclusive) Over 30 300 200 250 ___________________ * The necessity of heating during welding of parts made of steel grade 22K is established upon agreement with the leading material study organization ** The heating is permitted to avoid in case thickness of up to 150 mm inclusive. 6.2.8. Welding of parts made of perlitic and high-chromium steels (as among themselves as with parts made of austenitic steels), which edges have been preliminary overlaid with austenitic filler materials, is carried out without heating. 6.2.9. In cases where the part edges made of perlitic steels have been preliminary overlaid with high-chromium filler materials the minimum heating temperature is established with regard to the parts made of perlitic steel but not lower than 100°С. 6.2.10. Welding of parts made of high-chromium steels with parts made of perlitic steels where the edges have been preliminary overlaid with high-chromium filler materials is carried out with heating, which necessity and minimum heating temperature are established with regard to the part made of high-chromium steel. 6.2.11. Overlaying of corrosion resistant coating on parts (items) made of carbon and manganese-silicon steels is done without heating. 6.2.12. In case of overlaying of corrosion resistant coating on parts (items) made of alloyed steels the necessity and minimum heating temperature are established depending on steel grade and thickness of parts being welded are established pursuant Table 12, and if it does not contain the necessary guidance – pursuant the PED. Table 12 Minimum heating temperature for overlaying of the first layer of corrosion resistant coating Steel grade of Type of filler material Nominal thickness of part Minimum heatthe part being being overlaid, mm ing temperaoverlaid ture, oC 20ХМА Welding tape Irrespectively of thickness Coated welding elec- Up to 100 (inclusive) trodes, wire Over 100 100 10ХН1М Up to 100 (inclusive) Welding tape 10ГН2МФА Over 100 50 10ГН2МФЛ Coated welding elec- Up to 50 (inclusive) trodes, wire Over 50 50 15Х2НМФА Welding tape Up to 100 (inclusive) 15Х2НМФА-А Coated welding elec- Over 100 50 15ХЗНМФА trodes, wire Up to 100 (inclusive) 50 Over 100 100 12Х2МФА Welding tape, coated Irrespectively of thickness 150 15Х2МФА welding electrodes, 15Х2МФА-А wire 18Х2МФА In case of overlaying of two-layer and multi-layer corrosion resistant coating the heating is carried out only for overlaying of the first layer. 6.2.13. When the parts made of two-ply steel with the basic layer of carbon and manganese-silicon steels or steels 10ГН2МФА and 10ГН2МФАЛ the separating and protective overlays are fabricated without heating. 6.2.14. The preliminary and concurrent heating of the parts (items) being welded should be done using electric, gas or other heaters, which provide for the required heating of metal over whole length (perimeter) of the joint or all area of overlay (the area sizes are established in the PED). In case of local heating of branches less than 100 mm in length the width of the heating zone L should be equal to the branch length, and in case local heating of bottoms, flanges and plugs it should be established by the PED. 6.2.15. In case of local heating of cylindrical parts (barrels, pipes, branches, etc.) with annular welded joints the width of the heating zone L within which temperature should not be less than the minimum heating temperature indicated in Table 12 and not higher that the maximum temperature indicated in para. 6.2.2 both sides of the weld axis should be L ≥ DS , where D and S are the nominal outer diameter and wall thickness of the parts being welded. The permissible deviations from the above requirement, as well as minimum sizes of zone L, where the process is carried out with local heating of other welded joints and overlay is established in the PED but in any case the width of zone L should not be less than 100 mm. 6.3. Welding of parts made of different structural steel classes. 6.3.1. For fabrication of welded joints of parts made of different structural steel classes, including the preliminary overlaying of edges, the welding materials pursuant Tables 2, 4, 6 and 8 should be used. 6.3.2. When parts made of austenitic steels are welded with parts made of carbon and manganese-silicon steels of nominal thickness more than 10 mm the edges of parts made of carbon and manganese-silicon steels should be preliminary overlaid (except for the cases pursuant the Note 5 to Table 4); after machining the overlay thickness should be 6 ± 2 mm for manual arc coated electrode welding and argon-arc welding and 9 ±2 mm for automated hidden arc welding. It is allowed to fabricate joints by manual arc coated electrode welding and argon-arc welding with the edges as overlaid for automated hidden arc welding. 6.3.3. In case welding of parts made of austenitic steels with parts made of alloyed and high-chromium steels with nominal thickness of more than 6 mm the edges of parts made of alloyed and high-chromium steels should be preliminary overlaid (except for the cases described in Note 5 to Table 4); tafter machining he overall thickness of the overlay should be 9+2 mm, the first layer thickness being 3+1 mm. 6.3.4. While making angle, tee-joints and lap welded joints of parts made of carbon and manganese-silicon steels the necessity of preliminary overlaying of edges pursuant para. 6.3.2 is determined by the design height of the angle weld (instead of nominal thickness). For other steel classes the design height of the angle weld at which it is necessary to preliminary overlay edges is established by the PED. 6.З.5. In case of automated hidden arc welding of parts made of perlitic steels with parts made of high-chromium steels the edges of parts made of perlitic steels should be preliminary overlaid with coated welding electrodes intended for welding of parts made of high-chromium steel. The above overlay should be made not less than in three layers and have the overall thickness not less than 7 mm after machining. 6.3.6. In case of welding in the assembling conditions of pipes made of different steel structural classes where there is no preliminary overlay on edges made at the manufacturing enterprise the special adapting pipes manufactured in factory conditions should be used. The use of said adapting pipes should be provided for in the design documentation. An adapting pipe represents an assembly unit made of two pipe sections welded together, each section being in correspondence, in terms of steel grades, with the respective pipes to be joined together. The adapting pipe length is determined by the permissible distance between welds in accordance with NPI Rules. 6.3.7. When the welds made by austenitic and perlitic filler materials are crossing the weld to be made with perlitic filler materials should be fabricated first. 6.3.8. The width of weld metal or preliminary overlay surface, made with welding electrodes ЭА 395/9, ЦТ-10 or welding wire Св-10Х16Н25АМ6, to be facing water, steam-water and steam coolant environs should not exceed 7 mm. 6.4. Welding of parts made of two-ply steel. 6.4.1. While preparing the parts made of two-ply steel for welding the clad layer should be removed from the sections adjacent to the edges subject to welding (on their opening side), as well as from the angle weld locations except for the cases described in this Subsection. The width of clad layer zone to be removed should not be less than 5 mm for manual arc coated electrode welding and argon-arc welding, and not less than 10 mm for automated hidden arc welding. In case of angle and teejoints the clad layer zone to be removed should go beyond the angle weld boundary not less than the indicated width values. In case of welded joints which basic layer is made of perlitic steel and is subject to ultrasonic and/or radiographic inspection before the clad layer is applied, the width of clad zone to be removed should be such to provide for a possibility of the above inspection. 6.4.2. While making welded joints with removal of clad layer, first welding of the base layer made of perlitic steel is done and then the clad layer is welded (overlaid). 6.4.3. Welding of base layer should be done with welding materials designed for welding of parts made of the base layer steel. 6.4.4. Welding (overlaying) of the clad layer includes fabrication of separating and protective overlays (Fig. 1). Fig. 1. Grooving and welded joints of parts made of two-ply steels: 1 - weld; 2 – separating overlay; 3 – protective overlay 6.4.5. The separating overlay should be made with coated welding electrodes ЦЛ-25/1 or ЗИО-8, welding wire Св-07X25Н13 (for argon-arc overlaying), welding tape Св-07Х25Н13 in combination with fluxing agent ОФ10 or with welding tape СВ-04Х20Н10Г2Б in combination with fluxing agent ФЦ-18 (for automated hidden arc overlaying). At this, the sizes of the welded joint elements should correspond to those indicated on Fig. 1. In case the weld reinforcement is to be removed the weld reinforcement sizes indicated on Fig. 1 are established by the design organization upon agreement with the leading material study organization. 6.4.6. The protective overlay should be made in not less than two layers with the following welding (overlaying) materials: • in case the welded joint is not subject to heat treatment – with the welding materials as per para 6.4.5 or coated welding electrodes ЭА-400/10У, ЭА-400/10Т, ЦТ-26, ЦТ-26М, ЭА-898/21Б, ЦТ-15К, ЦЛ-25/2, or welding wire Cв-04XI9H11M3, Св-04Х20Н10Г2Б, Св-08Х19Н10Г2Б (for argon-arc overlaying) or welding tape Cв04XI9H11M3, Св-04Х20Н10Г2Б, Св-08Х19Н10Г2Б in combination with fluxing agents ОФ-10 or ФЦ-18 (for automated hidden arc overlaying) ; • in case the welded joint is subject to heat treatment – with coated welding electrodes ЭА-898/21Б or ЦТ-15К, or welding wire Св04Х20Н10Г2Б or Св-08Х19Н10Г2Б (for argon-arc overlaying) or welding tape Св-04Х20Н10Г2Б or Св-08Х19Н10Г2Б in combination with fluxing agents ОФ-10 or ФЦ-18 (for automated hidden arc overlaying). For cases specified in the PED it is permitted to fabricate the protective overlay with welding tape Св-04Х20Н10Г2Б in one layer. 6.4.7. The protective and separating overlays to be made by manual arc coated electrode welding should be fabricated in individual beads of width, which is not more than three diameters of the welding electrode core in use. In cases specified in the PED it is permitted to increase the width of the separating overlay beads up to four diameters of the welding electrode core. 6.4.8. The welding of parts with nominal base layer thickness (for angle and tee-joints – with design angle weld height) of up to 10 mm inclusive for carbon and manganese-silicon steels and up to 6 mm inclusive for alloyed steels is permitted to do with coated welding electrodes ЭА-855/51 or ЦТ-45, or with welding wire Св-0ЗХ15Н35Г7М6Б or Св-0ЗХ20Н45М6Г6Б-ВИ (for argon-arc welding) over all thickness on any side without removal of the clad layer. If the clad layer metal does not contain niobium and the welded joint is not subject to heat treatment, it is permitted to fabricate the base layer with coated welding electrodes ЭА-395/9 or ЦТ-10, or welding wire Св10Х16Н25АМ6 (for argon-arc welding) up to the level overlapping the clad layer not less than by 1 mm, and to fabricate the separating and protective overlays with coated welding electrodes ЭА-400/10У, ЭА-400/10Т, ЦТ-26, ЦТ-26М or welding wire Cв-04X19H11M3 (for argon-arc overlaying) in not less than two layers. 6.4.9. It is allowed to fabricate the one-sided welded joints, which are not accessible for welding on the clad layer side, without removing the clad layer with preliminary overlaying of edges pursuant Figs. 2 and 3. Fig.2. Preliminary overlaying of part edges made of two-ply steels with clad layer which does not contain niobium: 1 – carbon or manganese-silicon steel; 2 – clad layer; 3 – homogeneous overlay made with welding materials as per Table 4; 4 – alloyed steel; 5 – double overlay made with welding materials as per Table 4. Рис.3. Preliminary overlaying of part edges made of two-ply steels with clad layer which contains niobium: 1 - carbon or manganese-silicon steel; 2 - clad layer; 3 - homogeneous overlay made with welding materials as per Table 4; 4 – separating bead; 5 - alloyed steel; 6 - double overlay made with welding materials as per Table 4. At this, if the clad layer metal contains niobium a separating bead (see Fig. 3) should be made to avoid a direct contact of the clad layer with the preliminary overlay metal on edges. The separating bead should be fabricated with coated welding electrodes ЦЛ-25/1 or ЗИО-8, or with welding wire Св07Х25Н13 (for argon-arc overlaying). Thickness of the first layer and/or total thickness of the preliminary overlay should meet the requirements of para. 6.3.2, 6.3.3. 6.4.10. After the preliminary overlay as per para. 6.4.10 is complete the heat treat of parts in the overlay zone is done (if the heat treatment is envisaged by Section 8 and/or the PED) followed by machining. 6.4.11. The welding of parts with overlaid edges should be done with welding materials in accordance with Table 4 6.4.12. In case of welding of parts made of two-ply steel with the parts made of perlitic steel the clad layer is removed in accordance with para 6.4.1, then the welded joint is fabricated with the welding materials designed for welding of parts made of the corresponding steel grades followed by the restoring of the clad layer or without it. 6.4.13. When the parts made of two-ply steel are welded with those made of high-chromium steel the clad layer is removed as per para. 6.4.1, then the welded joint is fabricated with the welding materials designed for welding of parts made of the corresponding steel grades (with the preliminary edge overlaying pursuant Table 2 or PED) followed by the restoring of the clad layer as per para. 6.4.4-6.4.6. 6.4.14. When the parts made of two-ply steel are welded with the parts made of austenitic steel, the preliminary overlaying is done on their edges as per para. 6.4.10, and then the welded joint is fabricated with the welding materials in accordance with Table 4. 6.4.15. It is permitted to weld the protective shells as well as nonpressurized parts to the clad layer of the two-ply steel parts without removal of the clad layer in the angle welds’ locations if the design height of the angle weld does not exceed 8 mm. In doing so the welding materials indicated in Tables 3 and 4, designed for the relevant cases, should be used (the clad layer is considered as austenitic steel). 6.5. Electroslag welding. 6.5.1. Parts made of manganese-silicon and alloyed steels, as well as of high-chromium steel, should be sent for electroslag welding after complete heat treatment (normalization or hardening followed by tempering) and parts made of two-ply steel should be sent for welding having a clad layer made at a distance sufficient for installation of water-cooled slide blocks and cleats, as well as for subsequent ultrasonic testing. 6.5.2. The electroslag welding should not be interrupted until the welded joint is fabricated. In case of forced termination of the process it is allowed to resume welding after the section with a shrink hole is removed. In case of welding of parts made of alloyed steel such section is removed after a preliminary tempering of the completed welded joint section. In case of welding of parts made of austenitic steel, where the weld section having a shrink hole has been removed, it is mandatory to carry out austenization after the completion of the welded joint. 6.5.3. While fabricating annular welded joints of parts made of perlitic steel, after welding of 20-40% of the perimeter the initial weld section is removed by oxyacetylene, machine or plasma cutting or air-arc gouging. In case of parts made of alloyed steel the metal temperature in the oxyacetylene or plasma cutting or air-arc gouging zone should not be less than 200°С. The cut edges and adjacent weld and base metal surfaces should be cleaned from spits and dross. For annular welded joints of parts made of austenitic and highchromium steels the technique and conditions of cutting-out of the initial section are established in the PED. 6.6. Argon-arc welding. 6.6.1. For argon-arc welding the non-consumable tungsten welding electrodes made of tungsten grades ЭВЛ, ЭВИ-1, ЭВИ-2, ЭВИ-3, ЭВТ-15, lanthanized tungsten ВЛ or yttrated tungsten СВИ-1 are used as nonconsumable welding electrodes. 6.6.2. In case of welding of backing rings (or “whiskers”) of pipes and other cylindrical parts made of austenitic steel, high-chromium steel and ironnickel steel the argon (shielding gas mixture) shielding should be arranged for on the back side of the joint when the first two layers are fabricated (including in case of combined welding); the shielding is done by gas feed towards the back side of the weld or inside the product being welded. For parts made of perlitic steels the gas feed necessity is determined in the PED. To reduce the gas flow rate it is recommended to install removable plugs into the items being welded to create a chamber of required volume. The necessary protection of the weld root before the welding is achieved by the gas blowing through the chamber in the amount equal 4 to 5 times chamber volume, and during fabrication of the first two weld layers - by gas feed. 7. Overlaying of Corrosion Resistant Coatings 7.1. General requirements. 7.1.1. Overlaying of corrosion resistant coatings should be done in accordance with the PED developed pursuant the requirements of these BP and drawings. The PED for overlaying of corrosion resistant coatings should establish: • steel grades of items (parts) being overlaid; • characteristics of coatings as regards their types and number of overlaid layers; • overlaying technique; • qualification of welders; • • • • • • • welding (overlaying) equipment in use; grades (combinations of grades) of welding (overlaying) materials; assortment of filler materials; requirements to preparation of base metal surfaces for overlaying; type and polarity of welding current; overlaying spatial positions and modes; magnitude and direction of the welding electrode displacement regarding the vertical line to the surface of a product being overlaid (for bodies of revolution); • necessity, techniques and modes of preliminary and concurrent heating; • sequence of beads and layers fabrication; • grinding of overlaid layer surface and removal or welding of craters (for welding tape overlaying); • keeping conditions for the overlaid items since overlaying completion until the heat treatment; • necessity, types and procedures for machining of overlaid coatings; • techniques and scope of overlaid coating inspection; • other necessary data along with all process and control operations. Exemplary overlaying modes for certain corrosion resistant coatings are given in the Reference Attachment 2. 7.1.2. Corrosion resistant coatings are divided into homogeneous and double ones. A homogeneous coating is the coating fabricated with welding (overlaying) materials of one grade (one combination of grades of filler materials and fluxing agents or shielding gases) over all thickness irrespectively of number of layers being overlaid. A double corrosion resistant coating is the coating which first layer is overlaid with welding (overlaying) materials of the same grade (of one combination of grades) and second and subsequent layers are made with the welding (overlaying) materials of another grade (another combination of grades). N o t e . A layer of the overlaid corrosion resistant coating is a part of the coating formed by a row of beads located at the same level with regard to the base metal. 7.1.3. Homogeneous corrosion resistant coatings are divided into single-layer and multi-layer ones. A homogeneous single-layer coating is overlaid in one layer. A homogeneous multi-layer coating is overlaid in not less than two layers. 7.1.4. Double corrosion resistant coatings are divided into two-layer and multi-layer ones. A double two-layer coating is overlaid in two layers. A double multi-layer coating is overlaid in more than two layers. 7.1.5. Homogeneous multi-layer coatings made with filler materials, which are not alloyed with niobium, are overlaid only on parts (items), which are not subject to heat treatment. 7.1.6. Thickness of a homogeneous single-layer coating should be 4+−21 mm, and of a homogeneous multi-layer coating – not less than 5 mm (after final machining). N o t e . Thickness of a corrosion resistant coating (or its first layer) should mean a distance from the outer surface of the coating (from the first layer surface) up to its fusion zone with the base metal. 7.1.7. Thickness of the first layer of a double coating before the over+2 laying of the second layer should be 3 −1 mm. The total thickness of a double two-layer coating should not be less than 5 mm, and that of a multi-layer should not be less than 7 mm (after the final machining). At this, the total (cumulative) thickness should exceed the maximum measured thickness of the first layer not less than by 2 mm (after the final machining). 7.1.8. The maximum cumulative thickness of a coating should not exceed values established in the product drawings (provided the drawing contain corresponding requirements). 7.1.9. A layer thickness measurement procedure is established in the PED. 7.2. Overlaying process. 7.2.1. All parts (items) prepared for overlaying of a corrosion resistant coating should be marked and/or supplied with the documentation confirming that they have been accepted by the Technical Control Service. The marking technique is determined by the PED issued by the manufacturing enterprise (assembling organization). 7.2.2. Before overlaying the surfaces ground during the overlaying preparation process are subject to re-grinding and/or degreasing, as required by the PED. 7.2.3. The assembly units with welded joints made by electroslag welding should be subjected to the complete heat treatment before overlaying. 7.2.4. The corrosion resistant coatings should be fabricated using automated hidden arc tape overlaying with one or two tape welding electrodes (the recommended basic technique), manual arc coated electrode overlaying or argon-arc overlaying. Automated hidden arc wire overlaying is permitted in the cases below pursuant the instructions of Table 5: • for horizontal overlaying of inner surfaces of nozzles where the nozzle axis is vertical and the first (lower) annular bead of each layer is made by arc coated electrode overlaying followed by automated overlaying, the wire electrode angle of inclination is not more than 45o regarding the vertical; • where the additional filler wire of the same grade that the basic welding wire is introduced into the arc. 7.2.5 Corrosion resistant coatings should be fabricated with the welding (overlaying) materials indicated in Table 5. 7.2.6. While fabricating corrosion resistant coatings the necessity and temperature of preliminary and concurrent heating are set in accordance with the guidance of Subsection 6.2. 7.2.7. Manual arc coated electrode overlaying should be done with beads of the width which is not more than three diameters of the welding electrodes in use. It is allowed to increase the width of individual beads up to four diameters of the welding electrode core provided only one bead will be fabricated or the number of such beads will not exceed 5% of the total number of beads fabricated on the overlaid product. 7.2.8. In case of automated hidden arc tape overlaying each subsequent bead of the layer being fabricated should overlap the preceding one not less than 5 mm (in width). In case of manual hidden arc tape overlaying each subsequent bead should overlap the preceding one not less than 1/3 of its width. 7.2.9. During overlaying process, after completion of each subsequent bead its surface and adjacent surfaces of base and/or overlaid metal should be thoroughly cleaned from slag, metal spay and other soiling and visually inspected (by the welder) to find out whether defects are present. In case where defects (cracks, scabbing, undercuts, bulging) are present they should be eliminated before the next bead is made. In case of overlaying using a welding tape all craters (shrink holes) formed when the overlaying process is interrupted should be also eliminated (grinding using an abrasive tool to provide for a smooth transition to the previously overlaid metal). The overlaid layer surface should be free of falls and shelves between beads more than 2 mm deep (high). Falls and shelves in excess of the above depth (height) should be ground to achieve the indicated value and provide a smooth transition (not more than 1:10 inclination) to the adjacent overlay surface or they should be welded by coated welding electrodes or argon-arc overlaying. At this, after the above operations are completed the requirements of paras.7.6.1 and 7.1.7 should be met. 7.2.10. After each layer is completed its surface should be additionally ground (if necessary) and visually inspected over the whole area. 7.2.11. Each subsequent layer should be made only after the above operations are completed (over the whole area) except for large-size items which overlaid surfaces are located in different spatial position. 7.2.12. It is recommended to overlay the first layer without interruptions. The overlaying procedures for the second and subsequent layers should provide for decrease in temperature of the previously made layer down 100oC (by the arc approach) in the area where the next bead is to be fabricated. In case of automated overlaying of the second and subsequent layers with welding tape Св-04Х20Н10Г2Б it is allowed to increase the indicated temperature up to 250°С provided it is monitored periodically at a distance of 150-200 mm from the arc moving forward (ahead of the arc along the axis of bead being overlaid). The monitoring frequency is established by the PED depending on the size of items being overlaid. 7.2.13. If there is an non-permissible roughness (pockets between beads, etc.) the surface of fabricated corrosion resistant coating is machined with an abrasive wheel or by cutting. Depending on the number and locations of the rough areas the surface is machined locally or totally. The coating thickness after machining should satisfy the requirements of paras. 7.1.6 и 7.1.7. N o t e . It is allowed to eliminate non-permissible falls by welding with the welding materials used for the upper layer of the corresponding coating provided the machining is done within this layer. 7.2.14. In cases specified in the design documentation it is allowed to overlay a corrosion resistant coating on items made of austenitic steels to protect them from corrosion damage. The above coating is fabricated with coated welding electrodes ЭА-855/51 or welding tape Св-0ЗХ15НЗ5Г7М6Б in combination with fluxing agent ОФ-10 (for automated hidden arc overlaying) or welding wire Св-0ЗХ15НЗ5Г7М6Б (for argon-arc overlaying). In this regard the number and dimensions of layers are established in the PED. 8. Heat Treatment 8.1. The necessity and type of heat treatment of welded joints and overlaid items are established in accordance with this BP and indicated in drawings. 8.2. Heat treatment of welded joints and overlaid items should be done in accordance with the PED developed pursuant the requirements and guidance this BP and drawings. The PED for heat treatment should indicate: • name and codes of welded (overlaid) items; • grades of base materials of welded or overlaid items; • characteristics of overlays (preliminary on edges, overlaid corrosion resistant coating along with its type, etc.); • minimum nominal thickness of welded (overlaid) parts (assembly units) which determines the necessity of heat treatment of welded joints or overlaid parts (depending on the base metal grade); • keeping condition for welded joints and overlaid items from the end of welding (overlaying) till the beginning of heat treatment (whether cooling is permitted without a “thermal rest” or after it, permissible cooling temperature and duration, retaining of a given heating temperature, immediate placement into the hot furnace, etc.); • types of heat treatment along with a description of the sequence of its individual stages (including preliminary, intermediate and final tempering); • heat treatment techniques along with a description of the heat treatment equipment to be used; • heat treatment modes on its each stage (furnace temperature during loading; heating rate; temperature as well as their duration depending • • • on nominal thickness ranges within the welded joint or overlay zone; conditions, environs or cooling rate, etc.); techniques and procedures for monitoring of temperature modes (including the thermocouple thermometer number, location and fixing methods; permissible number and total duration of intermediate and final tempering of welded joints and overlaid items (parts); other necessary data along with descriptions of all process and control operations. 8.3. Welded joints should be kept in conditions as per Table 13 between the end of welding and the beginning of heat treatment in cases where the “thermal rest” is not required. 8.4. In case of “thermal rest” the welded joints should be cooled down to not less than 5°С. Time is not limited from the “thermal rest” till heat treatment. 8.5. Table 14 shows the minimum temperature and duration of the “thermal rest”. The maximum temperature of the “thermal rest” should not exceed the minimum one more than 100°С. In case of local “thermal rest” the heating zone width should be the same as the one for the preliminary and concurrent heating pursuant para. 6.2.13. 8.6. For welded joints made of different steel grades the minimum “thermal rest” temperature is assumed with regard to the steel grade for which a higher temperature value is set. 8.7. In cases not covered by Table 13 the keeping conditions within the period of time between the end of welding and the beginning of heat treatment are established in the PED. 8.8. The time interval between the end of the prelimnary edge overlaying of parts made of steel grades 12Х2МФА, 15Х2МФА, 15Х2МФА-А, 18Х2МФА and the beginning of the heat treatment should not exceed 20 days, and in other cases it should not exceed the time limits set in the PED. Before the heat treatment the metal temperature of parts with overlaid edges in all cases should be not less than 5°С. 8.9. The time interval between the end of the overlaying of a corrosion resistant coating on items made of steel grades 12Х2МФА, 15Х2МФА, 15Х2МФА-А, 15ХЗНМФА, 15ХЗНМФА-А, 10XH1M and the beginning of the heat treatment should not exceed 30 days, and in other cases it should not exceed the time limit set in the PED. Within the indicated time interval the metal temperature of parts with overlaid edges in all cases should be not less than 5°С. 8.10. The following heat treatment techniques are applied during manufacturing (assembling) of welded joints: • tempering; • complete heat treatment (normalizing or hardening followed by tempering); • austenization. Table 13 Keeping conditions for welded joints between the end of welding and the beginning of heat treatment Steel grades of welded parts Nominal wall thickness of welded parts, mm Minimum permissible temperature of metal in the weld area, °С Maximum permissible time interval, h 10ГН2МФА, 10ГН2МФЛ, 15ГНМФА Over 50 70 Not regulated 20ХМ, 20ХМЛ, 20ХМА Independently of thickness Not regulated 72 10X2M Over 30 100 Not regulated 12Х1МФ, 15Х1МФ Over 6 Not regulated 72 05X12H2M Over 30 80 Not regulated 15Х2НМФА, 15Х2НМФА-А, 15ХЗНМФА, 15ХЗНМФА-А Independently of thickness 150 The same 12Х11В2МФ Over 3 Not regulated 72 06Х12НЗД Over 10 100 Not regulated 12А2МФА Independently of thickness 175 The same 15Х2МФА, 15Х2МФА-А The same 200 " 18Х2МФА " 300 " Table 14 “Thermal rest” modes for butt welded joints fabricated by arc or electronbeam welding Steel grades of welded parts Nominal wall thickness of welded parts, mm “Thermal rest” mode Minimum temperature, Minimum duration, h °С 10ГН2МФА, 10ГН2МФЛ Over 50 up to 110 (inclusive) 150 8 15ГНМФА Over 110 150 18 10X2M, 05XI2H2M Over 30 100 8 12Х1МФ Over 6 130 8 15Х1МФ Over 6 150 10 06Х12НЗД, 15ХЗНМФА, 15ХЗНМФА-А Independently of thickness 150 12 08Х13 Over 10 100 8 The welded joints of parts made of perlitic or high-chromium steels fabricated by arc or electron-beam welding are subjected to tempering. The welded joints of parts made of perlitic or high-chromium steels fabricated by electroslag welding are subjected to complete heat treatment. The welded joints of parts made of austenitic steel are subjected to austenization. 8.11. Tempering may be intermediate and final. The intermediate tempering is carried out after fabrication of individual welded joints (reinforcement overlays) if such joints (overlays) are eventually to be subjected to re-tempering (once or more times). The final tempering is done after all intended welding (overlaying) and heat treatment operations have been completed for the given welded or overlaid item as well as after the defects in welded joints (overlays) have been eliminated by welding (overlaying). Besides, the preliminary tempering is carried out after the preliminary overlaying of edges, as well as after complete heat treatment of welded joints made by electroslag welding. 8.12. The nominal temperature of intermediate tempering should be not less than 15°С lower than the nominal temperature of the final tempering. 8.13. In all cases the nominal temperature of final tempering of welded joints and overlaid parts should not exceed the nominal tempering temperature of the base metal when it is subjected to complete heat treatment under modes established by a standard or specification for semi-finished products made of the corresponding steel grade. 8.14. The necessity and temperature of tempering for welded joints of parts made perlitic or high-chromium steels fabricated using arc or electronbeam welding are established in accordance with Table 15 depending on a steel grade and nominal thickness of parts being welded. If Table 15 does not provide for the corresponding guidance the necessity and tempering temperature are set pursuant the PED. In cases specified in the PED it is permitted to temper welded joints for which Table 15 does not indicate the necessity of tempering due to the nominal thickness of the welded parts. 8.15. It is mandatory to temper he welded joints of parts made of different steel grades and/or of different nominal thickness in the following cases: • if, pursuant the guidance of Table 15, the steel grade and nominal thickness of each of the welded parts condition the necessity to temper the welded joint; • if, pursuant the guidance of Table 15 the steel grade of at least one of the welded parts conditions the necessity to temper the welded joint irrespectively of the nominal thickness of the parts. In other cases the necessity to temper the indicated welded joints is established in accordance with the PED. 8.16. Tempering temperature for the parts made of different steel grades for which Table 15 provides different tempering temperatures is established by the PED. At this the nominal tempering temperatures should be within the range of the nominal temperatures, which are determined pursuant Table 15 guidance for tempering of welded joints made of corresponding steel grades and should not satisfy the requirements of Subsections 8.12 и 8.13. Таблица 15 Tempering temperature of welded joints fabricated using arc or electron-beam welding Steel grades of parts being welded Nominal thickness of welded parts, mm Ст3сп5, 10, 15, Up to 36 (in15Л, 20, 20Л clusive) Tempering temperature, °С intermediate final nominal limiting nominal limiting deviations deviations - - - - 610 ± 20 630 ±20 - - - - 620 ±20 640 +20 -10 - - - - 620 ±10 640 +10 -15 - - - - 630 ±15 650 ±15 - - - - Over 10 620 ±10 650 ±10 Irrespectively of thickness 620 ±10 650 ±10 - - 650 - ±10 - Over 25 640 ±15 660 ±15 12Х2МФА, 15Х2МФА, 15Х2МФА-А, 18Х2МФА Irrespectively of thickness 655 ±10 670 ±10 05Х12Н2М 20ХМА, 20ХМ, 20ХМЛ The same " 670 .115 670 700 ±20 ±15 Over 36 20К, 22К, 25Л Up to 36 (inclusive) Over 36 06Х12НЗД Up to 10 (inclusive) Over 10 15ГС, 16ГС, Up to 30 (in20ГСЛ, 09Г2С, clusive) 10ХСНД, 10XH1М Over 30 10ГН2МФА. 10ГН2МФАЛ 15Х2НМФА, 15Х2НМФА-А, 15ХЗНМФА, 15ХЗНМФА-А 07Х16Н4Б 16ГНМА, 15ГНМФА Up to 10 (inclusive) The same Up to 25 12MX, I2XM, I5XM - - - - Over 10 Up to 6 (inclusive) 690 - ±20 - 710 - ±20 - Over 6 12ХМФ, 20ХМФЛ Up to 6 (inclusive) 690 - ±20 - 710 - ±20 - Over 6 715 ±15 730 ±120 15Х1М1Ф, 15Х1М1ФЛ Up to 6 (inclusive) - - - - 12Х11В2МФ Over 6 Up to 3 (inclusive) 725 - ±15 - 740 - ±15 - Over 3 730 ±15 750 ±15 10X2M, 12Х2М1Л, 08Х13, 12Х13 Up to 10 (inclusive) Notes: 1. For butt welded joints the nominal thickness of welded parts should mean their nominal thickness in the zone adjacent to the weld. 2. In case of the local heat treatment (tempering) of welded joints of parts made of steel grades СтЗсп5, 10, 15, 15Л, 20, 20Л. 20К, 22К. 25Л, 15ГС, 16ГС, 20ГСА, 09Г2С. 10ХСНД, 10XH1M, 10ГН2МФА. 10ГН2МФЛ, 16ГНМА, 15ГНМФА, 12MX, 12Х, 15Х, 20ХМЛ, 12Х1МФ, 20ХМФЛ, 15Х1М1Ф and 15Х1М1ФЛ, upon agreement with the leading material study organization, it is permitted to increase the total limiting deviations by up to 40°С with regard to the nominal tempering temperatures indicated in the Table. 3. Upon agreement with the leading material study organization it is permitted not to carry out high-temperature tempering of welded joints of steel grades 10ХСНД and 10XH1M having the nominal wall thickness of up to 40 mm inclusive. 4. Where it is provided for by the PED it is allowed to increase the upper limit of the final tempering temperature up to 660°С for welded joints of parts made of steel grades Ст3сп5 and 20. 5. Where it is provided for by the PED it is allowed to carry out the intermediate tempering of welded joints of parts made of steel grades 12X2MФА and 15Х2МФА at temperature 650±10°С. 8.17. The necessity to temper parts after the preliminary overlaying of edges is determined using Table 15 the same way as for the welded joints of these parts without overlaid edges. At this, the parts which edges have been overlaid with austenitic filler materials are subjected to the preliminary tempering and the parts which edges have been overlaid with high-chromium filler materials are subjected to the intermediate tempering. 8.18. Parts with an overlaid corrosion resistant coating are subjected to tempering in cases specified in the PED. In doing so, the tempering tem- perature is established as per Table 15 the same way as for the welded joints of parts made of the same steel grade that the overlaid items are. It is recommended to combine tempering of items with corrosion resistant coating and tempering of welded joints. 8.19. The necessity and tempering temperature of welded joints made of two-ply steels where the base layer is welded using perlitic filler materials are determined by Table 15 without considering the plating layer thickness. 8.20. The welded joints of parts made of perlitic or high-chromium steels with parts made of austenitic steel, as well as those made of two-ply steel, fabricated with austenitic filler materials should not be subjected to heat treatment except for the cases specified in the drawings and/or PED. 8.21. For welded joints of parts made of austenitic steel with parts made of perlitic or high-chromium steels (except joints of Iн and IIн Categories), parts made of two-ply steel and parts (items) having overlaid corrosion resistant coating the number of final tempering times should not exceed five. 8.22. The arc or electron-beam welded joints of parts made of austenitic steel intended for operation at the temperature of up to 360°С (irrespectively of thickness of welded parts), and with nominal thickness of the welded parts of up to 10 mm inclusive and also intended for operation at temperatures above 360°С should not be subjected to heat treatment except for the cases specified in the drawings and/or PED. 8.23. The arc or electron-beam welded joints of parts made of austenitic steel with nominal thickness of more than 10 mm intended for operation at temperatures above 450°С (steel grades 08X18H10T, 12X18H9T, 12X18H10T), above 500°С (steel grades 08X18H10, 09Х18Н9, 10X18H9, 12Х18Н9), above 560°С (steel grade 08X16H11M3) are subject to austenization at temperature 1000±(20÷30)°С except for the cases specified upon agreement with the leading material study organization and indicated in the drawings and PED. When it is impossible to austenize the above welded joints the following technology is allowed subject to agreement with the leading material study organization: • Preliminary overlaying of edges of parts with coated welding electrodes A-1 (A-1T) or А-2 (А-2Т) (overlay thickness should meet the requirements of para. 6.3.2); • Austenization of parts with overlaid edges at 1000 ± (20÷30)°С; • Machining of overlaid edges; • Fabrication of a welded joint with welding materials as per Table 7 without subsequent heat treatment. The above technology should be specified in the drawings and incorporated into the PED. Necessity, type and modes of heat treatment of welded joints of Iн and IIн Categories of another steel grades as well as the above steels at lower temperatures are determined as agreed with the interagency leading material study organization and specified in the drawings and PED. 8.24. After electroslag welding, carried out with heating, of parts made of perlitic steel the welded joint should be preliminary tempered without cooling down the weld metal and weld region of the base metal below the mini- mum heating temperature applied during welding (except for cases specified in the PED). At this, the preliminary tempering temperature should not be lower than the final tempering temperature as determined in Table 15 depending on a steel grade being welded. 8.25. All electroslag welded joints of parts made of perlitic or highchromium steels, irrespectively of whether the preliminary tempering was done or not, should be subjected to complete heat treatment under modes established for the base metal. It is allowed to carry out the complete heat treatment of welded joints made of steel grades 10ГН2МФА and 10ГН2МФАЛ fabricated with coated welding electrodes ЦЛ-59. 8.26. All electroslag welded joints of parts made of austenitic steel should be subjected to austenization under the modes established for the base metal. 8.27. In case of the complete heat treatment of any welded joints, as well as in case of tempering or austenization of longitudinal, meridian, chord and annular welded joints and all overlaid parts, the welded (overlaid) items should be placed in the furnace in one piece. In case of tempering and austenization of annular welded joints of pipes and other cylindrical parts the local heat treatment is permitted provided it is specified in the drawings and/or PED. 8.28. In case of the local heat treatment of welded joints the total area of the controlled heating of metal consists of the basic and adjacent zones and should include the weld and adjacent sections of base metal at a distance L, which minimum values are given in Table 16 depending on the nominal diameters and thickness of the welded parts. Table 16 Width of the controlled heating zone of the base metal L1, mm Nominal sizes of welded parts in the weld adjacent sections Minimum distance, mm Outer diameter, mm Thickness, mm Up to 200 (inclusive) Up to 20 (inclusive) 40 Over 20 50 Over 200 up to 300 (inclusive) Up to 25 (inclusive) 60 Over 25 70 Over 300 up to 500 (inclusive) Up to 30 (inclusive) 90 Over 30 120 Over 500 up to 1000 (inclusive) Up to 50 (inclusive) 180 Over 50 до 100 (inclusive) 250 Over 100 300 N o t e . When the outer diameter of welded parts is more than 1000 mm the value of L1 is established by the PED. The major controlled heating zone includes the weld and adjacent base metal sections at distances equal to the nominal thickness of the welded parts where the part thickness is up to 50 mm (inclusive), and where the part thickness is greater at the distance of 50 mm. During hold-up period the metal temperature within the major zone should correspond to the preset tempering (austenization) temperature considering the established allowances. The additional controlled heating zone includes base metal sections of the general area, which are not included into the major zone. During the holdup period it is permitted to reduce the metal temperature comparing with the preset tempering (austenization) temperature, but not more than by 50°С regarding the minimum permissible temperature (considering the negative allowance), within the additional zone. 8.29. After welding of sheets or other semi-finished products (including those with overlaid corrosion resistant coating) to fabricate shaped parts by deformation techniques (expansion, punching, bending, etc.) the welded joints to be heat treated should be subjected to such operation before the deformation process. For hot deformation it is permitted not to carry out the heat treatment in cases specified in the PED. 8.30. In case of heat treatment of reference welded joints it is permitted not to carry out all process heating up to the temperature of 550°С for carbon and manganese-silicon steels and up to the temperature of 450°С for other steel grades (including heating in the course of welding and the “thermal rest”), which are conducted during manufacturing (assembling) of industrial welded items before heat treatment (tempering, hardening, normalizing) as well as all types of tempering (including preliminary tempering) carried out be- fore normalizing or hardening. Irrespectively of whether the above process heating and tempering, carried out before normalizing or hardening, were done or not the reference specimens’ testing results are true for the similar industrial welded joints as those subject to heating and tempering as those that are not. 8.31. The furnace temperature at the moment of a welded item loading for heat treatment should differ from the temperature of metal of the item subject to heat treatment but not more than 300°С. 9. Elimination of Defects 9.1. All defects (non-permissible deviations from the standards established by the RFI) revealed in welded joints and overlaid items in the course of non-destructive testing (including defects in the preliminary overlay of edges) are subject to elimination. 9.2. The defective sections should be eliminated in accordance with the PED for elimination of type defects, which was developed pursuant the requirements of this BP and RFI. 9.3. The surface defects should be removed by machining to provide smooth transitions in the locations of falls (using abrasive tools, cutting or punching followed by grinding). 9.4. Elimination of defects without subsequent welding of their fall locations is permitted for: • welded joints – when in location of the maximum fall the remaining weld and base metal thickness is not less than the design part (assembly unit) thickness in the weld zone but not less than 75% of its nominal thickness; • for overlaid surfaces – when the remaining thickness of the overlay is not less than the minimum permissible pursuant para. 7.1.6 and 7.1.7, and in cases which are not specified in Section 7 it is not less then the minimum permissible one pursuant the drawing. 9.5. The defects with welding of falls in welded joints made by arc and electron-beam welding and subject to heat treatment should be eliminated after tempering of the welded joint (preliminary, intermediate or final). It is permitted to eliminate defects before tempering of welded joints if their cooling down to the temperature of 5°С after welding is permitted by Table 14 and the PED. 9.6. The internal defects (defective regions) should be eliminated by machining (an abrasive tool, by cutting or punching followed by grinding). It is allowed to eliminate defects by air-arc or plasma-arc gouging followed by machining of the fall surface: • until the gouging traces are completely removed – on fall surfaces of welding joints of parts made of carbon or manganese-silicon steels; • with removal of not less 1 mm layer of metal - on fall surfaces of welding joints of parts made of alloyed steel with the guaranteed yield stress of not more than 315 MPa at 20°С or of austenitic steel; • with removal of not less 2 mm layer of metal - on fall surfaces of welding joints of parts made of alloyed steel with the guaranteed yield stress of more than 315 MPa at 20°С or of high-chromium steel. 9.7. Shape and sizes of prepared falls should provide for their welding over the whole volume. The sizes of falls subject to welding are not limited. At this, the falls made in the weld metal (overlaid metal) may intrude into the base metal. 9.8. The falls should be eliminated by one of the welding (overlaying) techniques allowed by para 6.1.2 for fabrication of the welded joints (overlaid layers) to be corrected using the corresponding welding (overlaying) materials. 9.9. While eliminating the defects all regulations of this BP, which relate to fabrication of the welded joints (overlaid items) to be corrected including preliminary and concurrent (in the course of welding (overlaying) heating and subsequent heat treatment. In individual cases, upon agreement with the leading material study organization) it is permitted to weld falls without heating or subsequent heat treatment (for welded joints and overlaid items subject to heat treatment). 9.10. The defects in welded joints fabricated by electroslag welding should be eliminated by arc welding only after the complete heat treatment (for welded joints of parts made of perlitic or high-chromium steels) or after austenization (for welded joints of parts made of austenitic steel). It is permitted to apply the following technology while eliminating defects in the welded joints of parts made of alloyed steel subject to shaping: • normalizing (hardening) and subsequent tempering of an assembly unit with the welded joint made by electroslag welding; • cutting-out of defects; • welding of falls with carbon filler materials; • shaping of the assembly unit along with heating up to the given temperature; • normalization (hardening) and subsequent tempering of the item; • complete removal of metal overlaid with carbon filler materials; • welding of falls with corresponding alloyed filler materials; • tempering of the corrected welded joint. The set of above operations is considered as one corrective measure. 9.11. Correction of assembly units (items) with defective tubular butt welded joints is permitted to carry out by cutting-out of the defective welded joint followed by welding of an insert (pipe section). The insert sizes are determined by the requirements to the distance between neighboring annular welds as per NFI Rules, Subsection 2.4. In this case both welded joints fabricated are considered uncorrected. 9.12. In cases specified in the PED the correction of defective welded joints is permitted by the complete removal of the weld followed by preparation of edges using machining and fabricating the welded joint anew. In this case the new welded joint is considered uncorrected. 9.13. Elimination of defects on one and the same section of a welded joint or overlaid part is permitted only for three times. At this, the corrected section should mean a rectangle of a lest area, which fits the fall subject to welding, and the adjacent surfaces at a distance equal to three-time width of the said rectangle (Fig. 4). Fig. 4. The determining of sizes of the section to be corrected (aвcd is the rectangle of the least area, which fits the fall; n is the rectangle width; ABCD is the section to be corrected) The issue concerning the correction of defects on one and the same section of the welded joints (overlaid part) in excess of three times should be resolved subject to an agreement with the leading material study organization and Regional Office of Gosatomenergonadzor of the USSR. 9.14. The following provisions should be followed when the defects are eliminated in the course of fabricating of welded joints (overlaying parts): • if crack ar detected the welding (overlaying) should be terminated and resumed only after the cracks are eliminated and crack re-currence prevention measures are taken; • if the backing ring burn-through is detected the tubular welded joints inaccessible for welding on their inner side should be completely removed and fabricated anew (provided it is impossible to eliminate the defect without cutting); • the number of corrections of the weld root on one and the same section should not exceed three; • the number of corrections (except for those in the weld root) is not limited and considered in case of fall depth within the nominal thickness of two weld layers; • the number of corrections on one and the same section of the weld should not exceed three if the fall depths exceeds the nominal thickness of two weld layers. 9.15. The number of recorded corrections of defects during welded joint fabrication and in the completed welded joint is not summed up (accounted for separately). 10. Marking of Welded Joints and Overlaid Parts (Items) 10.1. The welded joints and overlaid parts (items) should bear stamps identifying the name of welder (welders) who did the welding or overlaying. The stamping depth and size are established in the PED basing of the design documentation requirements. It is allowed to use other marking techniques instead of stamping provided they ensure marking durability during operation and do not reduce quality and reliability of welded (overlaid) items. 10.2. Stamps (marking) should be applied on the outer side of the welded joints at a distance of 30 to 50 mm from the edge of the weld reinforcement. At this, in case longitudinal and other open welded joints the stamps should be applied at a distance of 100 to 200 mm from the weld end. 10.3. Each welded joint should bear all stamps of welders participated in its fabrication. At this, before the stamp of the welder who preliminary overlaid the edges should be the additional stamp “H” and the additional stamp “K” should be placed before the stamp of the welder who fabricated the weld root (root layer). If the welded joint over its cross-section is fabricated by one welder the above stamps are not applied. If a welder fabricated only an individual section of the welded joint his/her stamp should be applied in the middle of the section he/she did considering the guidance of Subsection 10.2. 10.4. If all welded joints of the item have been made by one welder it is permitted not to stamp (mark) each welded joint. In this case the welder’s stamp is applied near the manufacturer’s label or on another free area of the item (or welded unit) and the stamp location is embodied into a visible frame, which is made with unwashable paint (the latter does not cover the surfaces of items to be in contact with the coolant). 10.5. In case of parts (items) with an overlaid corrosion resistant coating the welders’ stamps (marks) should be applied on a free section of the item on the part opposite to the overlaid one. 10.6. In case the stamps (marks) are to be eventually removed by machining they should be restored in the same locations. 10.7. In individual cases, as specified in the design documentation, where the stamping (marking) can degrade quality and reliability of the welded items, as well as where it is impossible to preserve stamps (marks) during operation, the equipment or pipeline certificate should be supplemented with rough drawings (schematic views) of the item to indicate the locations of unmarked welded joints and stamps of welders who did the welding (overlaying). 11. Safety Requirements 11.1. The sanitary and hygienic conditions at the welding and overlaying stations, as regards to the industrial premises, equipment, processes, tooling, district heating, ventilation and lighting, should satisfy the Sanitary Rules for Welding, Overlaying and Cutting of Metal approved by the Ministry of Public Health of the USSR. 11.2. While conducting welding operations it is required to follow the Unified Fire Safety Rules for Industrial Enterprises approved by the Ministry of Inferior of the USSR and the Rules for Technical Operation of Consumers’ Power Installations and Safety Rules for Operation of Consumers’ Power Installations approved by the Ministry for Energy of the USSR. 11.3. While conducting the heating and heat treatment the requirements of rules indicated in Subsection 11.2 should be followed along with the Rules for Safety-at-Work and Industrial Hygiene for Heat Treatment of Metal approved by the Central Committee of Trade Unions of the Machine Building Workers. 11.4. While conducting operations related to welding and overlaying of the equipment and pipelines the requirements of the Hygienic Standards and Rules for Limitation of Vibration at Work Places and Hygienic Standards for Sound Levels at Work Places, approved by the Ministry of Public Health of the USSR, should be met. 11.5. Vibration parameters at the work places should be within the limits established by the Hygienic Standards and Rules for Operations with Tools, Mechanisms and Equipment Producing Vibration Transmitted Hands of Workers approved by the Ministry of Public Health of the USSR. 11.6. Welding operations where degreasing liquids are used should be conducted upon a special permit issued by a representative of the fire safety unit and a person responsible for welding operations at a given working bay. 11.7. In case of welding of parts with preliminary and concurrent heating the following safety precaution measures should be taken: the heated parts should be covered by a heat isolating material, the welded sections being left open only. 11.8. The administration of enterprise conducting welding operations should arrange for development of the corresponding safety procedures and for control over how they are followed. The procedures should be located at the relevant work places. 11.9. The administration of enterprise conducting welding (overlaying) operations should arrange for a periodic briefings and testing of safety-atwork knowledge of workers an engineering and technical personnel at least once in the quarter of a year. An unscheduled briefing is conducted if a worker has violated safetyat-work requirements. 11.10. The work permit for newly employed or transferred to another job welders (operators) is issued only after they are briefed and their knowledge in work safety is tested, the results being recorded in a special log. 12. Requirements to Structural Shapes of Welded Joints 12.1. The major recommended types of welded joints with the indication of the welding techniques applied, nominal thickness of parts being welded and the structural elements of prepared edges and fabricated welds are given in the recommended Attachment 3. Upon agreement with the leading material study organization it is permitted to apply the welded joints not specified in Attachment 3 provided they meet the RFI requirements. 12.2. The major recommended types of welded joints of parts made of perlitic and high chromium steels are given in Tables ПЗ.1 - ПЗ.19, П3.21-ПЗ24, ПЗ.ЗО-ПЗ.32, П3.34, ПЗ.36, ПЗ.38-ПЗ.41, ПЗ.51-П3.54 – for butt rectilinear and annular welded joints with inner diameter of joined parts over 750 mm; in Tables ПЗ.17, П3.20-П3.23, П3.25-П3.28, П3.30, П3.32, ПЗ.34, ПЗ.36, П3.38-П3.40, П3.42-П3.46, ПЗ.48, П3.49 – for butt welded joints with inner diameter of joined parts of up to 750 mm; in Tables П3.55-П3.65 – for angle, tee-joint and edge welding joints. 12.3. The major recommended types of welded joints of parts made of austenitic and iron-nickel steels are given in: Tables П3.1-П3.7, ПЗ.11-ПЗ.19, ПЗ.22, ПЗ.29-П13.33, ПЗ.З5, ПЗ.37, ПЗ.47, ПЗ.48 - for butt rectilinear and annular welded joints with inner diameter of joined parts over 750 mm; in Tables П3.20-П3.22, П3.25-П3.28, ПЗ.30, ПЗ.32, ПЗ.33, ПЗ.З5, ПЗ.37, П3.42-П3.44, ПЗ.46, ПЗ.49, ПЗ.5О - for butt welded joints with inner diameter of joined parts of up to 750 mm; in Tables П3.55-П3.65 - for angle, tee-joint and edge welding joints. 12.4. Welded joints of parts made of steels belonging with different structural classes and of two-ply steel should correspond, in terms of geometry, to the welded joints of steels belonging with the same structural classes provided the requirements for preliminary overlaying of edges, grooving, cladding and separating and protective overlays, as specified in Subsections 6.3 and 6.4 are met. Structural elements of welding-prepared edges of parts made of different structural steels and/or two-ply steel after preliminary edge overlaying as per the requirements of Subsections 6.3 and 6.4 and machining should correspond to the requirements established for the accepted type of the welded joint without overlaying of edges, the cladding removal requirements of para. 6.4.1 being met. Structural elements of fabricated welded joints of parts made of different structural steel classes and/or two-ply steel should correspond to the requirements established for the accepted type of the welded joint of parts made of a homogeneous metal, the requirements of Subsections 6.3 and 6.4 being met. 12.5. In case of welding of parts which nominal thickness differs from the values given in Attachment 3 the sizes of structural elements of prepared edges and fabricated welds are taken in accordance with the ones established for parts having the most close thickness value. 12.6. While fabricating welded joints of types 1-21 and 1-25 (as modified) it is permitted to use argon-arc non-consumable electrode welding as with a filler material as without it. 12.7. The sizes of structural elements established for angle welded joints of types 2-03 and 2-04 relate only to the cross-section given in the drawing. The sizes of structural elements of other cross-sections are established in the drawings. 12.8. The welded joint of type 1-01 is permitted with the melt backing. In this case, when the nominal thickness of the parts being welded is up to 10 mm inclusive, it is permitted to weld on one side with one pass. 12.9. Roughness of the edges prepared for welding should not be more than R 80 z . 12.10. The shape and sizes of the remaining cylindrical backing rings and melted inserts, as well as the permissible values of gaps between a ring and welded parts, should correspond to those shown in Fig. 5. It is permitted to round the ring inner edges within radius of up to 3 mm instead of removing bevels on them. Fig. 5. The remaining cylindrical backing rings (а) and melted inserts (б). Dк = Dp (with regard to nominal size). For diameter Dк only negative limiting deviation is established (in drawings and/or PED). The limiting deviations of sizes Dк AND Dp should ensure the permissible gap value S . Diameter Dвc is established in drawings and/or the PED depending on the boring diameter Dp and the welded joint type. S, mm Sк , mm В, mm в, mm, not more than Nominal value Up to 75 (inclusive) Over 75 up to 150 (inclusive) Over 150 up to 300 Over 300 Limiting deviation 2.0 2.5 16-20 20-24 0.2 0.3 20-24 24-30 0.4 0.5 ±0.2 3.0 4.0 It is permitted to use melted inserts of other shape pursuant the guidance in drawings and or PED. 12.11. To ensure the minimum displacement of edges on the inner side of the joint it is recommended to do the cylindrical sizing (boring, expansion) of the pipe ends as it is shown in Fig. 6. In cases specified in the design documentation, to fabricate welded joints of pipes made of austenitic steel it is permitted to do a conical expansion (boring) of the pipe ends as per Fig. 7 using conical backing rings as it is shown in Fig. 8 provided the above structural features are considered in strength calculations. Fig. 6. The cylindrical boring (а) and sizing (expansion) (б) of pipe (nozzle) ends for butt one-sided welded joints. Diameters Dр are established by drawings and/or PED. At this for Dр only the positive limiting deviation is established. The length L of the cylindrical part of boring and sizing (expansion) of pipe (nozzle) ends for welded joints which are not subject to ultrasonic testing is as follows: S, mm From 1 up to 4 (inclusive) Over 4 up to 8 (inclusive) Over 8 up to 15 (inclusive) Over 15 up to 25 (inclusive) Over 25 up to 40 (inclusive) Over 40 up to 60 (inclusive) Over 60 up to 80 (inclusive) Over 80 L, mm, not less than 10 15 20 25 30 35 40 50 When the pipes (nozzles) are prepared for the welding joints subject to ultrasonic testing, the length L is established in the drawings and/or PED in accordance with the guidance of the regulatory and technical documentation for ultrasonic testing. Fig. 7. Conical boring for joints on a conical backing ring for S over 5 mm (а) and sizing (expansion) of pipe (nozzle) ends for S up to 5 mm (inclusive) (б) Fig. 8. A conical backing ring (Dр is the diameter of boring, expansion or sizing to fit the ring; Dк is the backing ring outer diameter) D, mm Up to 75 (inclusive) Over 75 up to 150 (inclusive) Over 150 Sк, mm 2.0±0.2 2.5±0.2 3.0±0.2 12.12. In cases specified in the design documentation it is permitted not fabricate or remove the weld reinforcement. 13. Deviations from Established Requirements Where it is technically or economically unreasonable to follow individual requirements of this document it is permitted to deviate from them provided there are justifications formalized in joint technical solutions made by the design organization and manufacturing enterprise (assembling organization) as agreed upon with the leading material study organization and Gosatomenergonadzor of the USSR. ATTACHMENT 1 (reference) REFERENCE BOOK of regulatory and technical documentation for welding materials permitted for manufacturing, assembling and repair of equipment and piping of nuclear power installations Welding materials Name Welding wire Welding tape Code of document Grade Св-08А, Св-08АА, Св-08ГА, СВ-10ГА, Св-10Г2, Св-08ГС, Св-12ГС, Св08Г2С, Св-08ГСМТ, Св-10НМА. Св08ХМ, Св-08ХМФА Св-10ХМФТ, СвСв08ХГСМА, Св-08ХГСМФА, 04Х2МА, Св-13Х2МФТ, Св10Х11НВМФ, Св-06Х14, Св06Х19Н9Т, Св-08Х19Н10Г2Б, Св08Х19Н10МЗБ, Св-04Х19Н11МЗ, Св07Х25Н13, Св-10Х16Н25АМ6, СвЗ0Х15Н35В3Б3Т Св-06А Св-10ГНМА, СВ-10ГН1МА, Св10ГН2МФА Св-10ХМФТУ СВ-12Х2Н2МА, Св-12Х2Н2МАА Св-09ХГНМТА, Св-09ХГНМТАА-ВИ Св-16Х2НМФТА Св-01Х12Н2-ВИ Св-01Х12Н2МТ-ВИ Св-09Х16Н4Б Св-0ЗХ16Н9М2 Св-021Х17Н10М2-ВИ Св-04Х17Н10М2 СВ-04Х20Н10Г2Б Св-0ЗХ24Н13Г2Б Св-0ЗХ15Н35Г7М6Б Св-08АА-ВИ Св-0ЗХ20Н45Г6М6Б-ВИ Св-06ХГСМТА, Св-14Х12НВМФ Св-13Х2МФТА Св-08Х19Н10Г2Б, Cв-04X19H11M3, Cв07X25H13, Св-10Х16Н25АМ6 ГОСТ 2246-70 ТУ 14-1-1569-75 ТУ 14-1-2860-79 ТУ 14-1-3034-80 ТУ-14-1-2502-78 ТУ-14-1-3675-83 ТУ 14-1-3633-83 ТУ 14-1-1212-74 ТУ 14-1-3595-83 ТУ 14-1-1692-76 ТУ 14-1-2208-77 ТУ 14-1-1005-74 ТУ 14-1-1959-74 ТУ 14-1-3252-81 ТУ 14-1-2205-77 ТУ 14-1-2143-77 ТУ 14-1-4355-87 ТУ 14-1-2206-77 ТУ 14-1-2808-79 ТУ 14-1-4370-87 ТУ 14-1-3146-81 Coated welding electrodes Св-04Х20Н10Г2Б Нп-0ЗХ22Н11Г2Б Св-0ЗХ24Н13Г2Б Св-0ЗХ15НЗ5Г7М6Б ЦУ-5, ЦУ-6, ЦУ-7, ЦУ-7А, ЦУ-2ХM, ЦЛ-20, ЦЛ-21, ЦЛ-25/1, ЦЛ-25/2, ЦЛ-32, ЦЛ-38, ЦЛ-39, ЦЛ-45, ЦЛ-48, ЦЛ-51, ЦЛ-59, ПТ-30, РТ45А, РТ-45АА, ЦТ-10, ЦТ-15К, ЦТ-26, ЦТ-26М, ЦТ-45, ЦТ-48 ЦЛ-52 ЗИО-8 ОЗС-4 ОЗС-6 ТУ 14-1-2270-77 ТУ 14-1-2750-79 ТУ 14-112207-77 ТУ 14-1-2162-77 ОСТ 108.948.01-86 Certificate № 223-73 * Certificate № ОC31-10-76(A) Certificate № OC31-11-76(A) УОНИИ-13/45, УОНИИ-13/45А, * УОНИИ-13/55, УОНИИ-13/45АА, УОНИИ-13/55АА, УОНИИ-13/10Х13, Н3, Н-6, H-10, Н-20, Н-23, Н-25, РТ-45Б, ЭА-395/9, ЭА-400/10У, ЭA-400/10T, ЭА-582/23, ЭА-855/51, ЭА-898/21Б, ЭА902/14, ЭМ-959/52, A-1, A-1T, A-2, A-2Т, КТЧ-7, АНО-4, МР-3 ТМУ-21, ТМЛ-1У, ТМЛ-3У Welding fluxing agents ОСЦ-45, АН-348А, АН-348АМ, АН-8, АН-22, АН-17M, АН-26, AH-26C КФ-27 КФ-30 АН-42, АН-42М, ОФ-6, ОФ-10, НФ18М, KФ-16 КФ-19, КФ-28, ФЦ-11, ФЦlФЦ-19, 16, ФЦ-16A, ФЦ-17, ФЦ-18, ФЦ-21, ФЦ-22 Lanthanized tung- ВЛ sten bars ГОСТ 9466-75 ГОСТ 9467-75 ГОСТ 9087-81 ТУ 5.966-11087-78 ТУ 5.965-11090-78 * ТУ 48-19-27-77 Yttrated tungsten bars СВИ-1 ТУ 48-19-221-76 Tungsten bars ЭВЛ, ЭВИ-1, ЭВИ-2, ЭВИ-3, ЭВТ-15 ГОСТ 23949-80 Gaseous and liquid Highest and first grade argon ГОСТ 10157-79 Helium Gaseous oxygen First and second grade for process applications Gaseous and liquid Highest and first grade carbon dioxide ТУ 51-940-75 ГОСТ 5583-78 ГОСТ 8050-85 Notes: 1. The documents marked with a asterisk are listed in the additional Reference Book of Gosatomenergonadzor of the USSR. 2. It is permitted to use the welding materials in accordance with other (not indicated in this Attachment) regulatory and technical documentation provided its requirements as stringent as those of the documentation indicated herein. 3. As new regulatory and technical documents to substitute those indicated herein come into force, the welding materials should be used as per new regulations, specifications and certificates. In doing so, it is permitted for two years after the replacement of a regulatory and technical document to use the corresponding welding materials in accordance with new regulations, which were supplied under the document (previously effective) indicated in this Attachment. ATTACHMENT 2 (reference) EXEMPLARY WELDING AND OVERLAYING MODES Table П2.1. Automated hidden arc welding Steel grade Perlitic Type of welded joint Nominal part thickness in weld region, mm 1-06 1-07 1-08 Over 50 1-12 1-13 Over 30 Welding mode parameters Welding Name and numbers of wire diamebeads Amperage, А Arc voltage, V Welding ter, mm speed, mm/sec 5 5 Root beads on the side of welding beginning 1 2 450-500 4803 530 550-600 34-40 34-40 34-40 10-12 8-10 the same Back side root beads 1 2 3 650-700 34-40 5-7 Grooving filling beads 550-700 34-40 5-10 Grooving filling beads 550-700 34-40 5-8 1-05 Austenitic 1-09 1-10 1-04 1-01 Over 30 up to 80 (inclusive) Root beads on the side of welding beginning 1,2 3 500-550 600650 Back side backing bead 950-900 34-40 34-40 10-11 8-9 42-45 5-7 Grooving filling beads 550-700 34-40 5-8 5 Grooving filling beads 550-700 34-40 5-8 Over 20 up to 60 (inclusive) 4 5 Any type " 400-500 500-550 28-30 32-34 3-5 6-8 Up to 10 (inclusive) 4 " 400-500 28-30 3-5 Over 10 4 1 2 600-650 700800 32-36 32-36 6-7 8-9 Over 30 5 Table П2.2. Automated argon-arc welding Steel grade Austenitic Type of welded joint 1-23 Nominal Tungsten Bead part welding elec- number thickness trode diamein weldter, mm ing region, mm 3.0 3.5 Over 1.6 up to 4 (inclusive) Over 1.6 up to 4 (inclusive) Welding speed, mm/sec Filler wire diameter, mm Welding wire advancement speed, mm/sec Welding wire to part distance (preset), mm Welding mode parameters Amperage, А Arc voltage, V Argon flow rate, l/min For burner For feed 1 2-4 - - 1-1.5 110-120 10-12 8-10 1-6 2-3 2-4 1.6 6-7.5 2-3 110-120 10-12 8-10 1-6 1 2-3 2-4 2-4 1.6 6-7.5 1.15 2-3 120-130 120-130 10-12 12-14 8-10 8-10 1-6 1-6 Table П2.3. Manual argon-arc non-consumable electrode welding Type of welded joint Steel grade Austenitic and perlitic 1-23 2-03 Iron-nickel alloys 2-04 1-23 2-03 2-04 Nominal thickness of parts Tungsten welding Filler wire diAmperage, A Argon flow rate, l/min in welding region, mm electrode diameter, ameter, mm Root bead Groove filling To burner For feed mm Over 3 up to 4 (inclusive) Over 4 up to 6 (inclusive) Over 4 up to 6 (inclusive) Over 6 Over 3 up to 4 (inclusive) Over 4 up to 6 (inclusive) Over 4 up to 6 (inclusive) Over 6 1.6-4.0 1.6-2.0 1.6-4.0 1.6-3.0 1.6-4.0 - 1.6-4.0 1.6-4.0 45-90 50-70 8-10 4-5 90-100 8-10 4-5 70-100 100-140 8-10 4-5 1.6-2.0 80-110 40-70 120-160 40-70 8-10 8-10 4-5 4-5 1.6-4.0 1.6-2.0 65-80 65-80 8-10 4-5 1.6-4.0 1.6-2.0 55-80 55-80 8-10 4-5 1.6-4.0 1.6-2.0 60-90 60-90 8-10 4-5 Table П2.4. Manual argon-arc non-consumable electrode pulse welding of piping made of austenitic steel Nominal thickness of Bead number Tungsten welding Filler wire di- Pulse dura- Pause dura- Welding current, A Argon flow rate, l/min parts in welding reelectrode diameter, ameter, mm tion, sec tion, sec gion, mm mm pulse pause To burner For feed 1.0-1.5 1 2,0 0.1-0.15 0.15-0.25 40-50 6-8 6-8 2-5 2 2.0 1.2 40-50 6-8 2-5 2.0-2.5 Over 2.0 up to 4.0 (inclusive) Over 4.0 up to 9.0 (inclusive) Over 9.0 up to 20.0 (inclusive) 1 2 2.0 2.0 1.6 0.4-0.6 - 0.3-0.5 - 50-70 50-70 6-8 - 6-8 6-8 2-5 2-5 1 2 and subsequent 1 2and subsequent 1 2 and subsequent 2.0-3.0 2.0-3.0 2.0-2.5 1.5-2.0 - 0.3-0.5 - 105-125 105-125 6-8 - 7-10 7-10 2-5 2-5 3.0 3.0 2.5-3.0 1.5-2.5 - 0.3-0.5 - 140-180 140-180 6-8 - 10-12 10-12 2-5 2-5 3.0-4.0 3.0-4.0 3.0-4.0 2.5-3.0 - 0.3-0.5 - 150-200 150-200 6-8 - 12-15 12-15 2-5 2-5 N o t e . The second and subsequent passes are made by non-pulse welding. Table П2.5. Semi-automated gas shielded (argon and carbon acid gas) consumable electrode welding of tubular parts made of austenitic steel; i-shaped grooving Welding wire diameter, mm Arc voltage, V 1.0; 1.2; 1.6 15-17 Amperage, A Pass number Gas flow rate to burner, l/min argon 120-160 Second and subsequent 12-14 carbon acid gas 2-4 N o t e . The first pass should be made by argon-arc non-consumable electrode welding using the modes given in Table П2.4. Table П2.6. Electroslag welding Characteristics Unit of measure Nominal thickness of parts in welding region mm 30-500 Gap between edges of welded parts Electrode wire diameter Steel grade of welded parts Perlitic Austenitic Electrode wire Consumable Electrode wire Consumable nozzle nozzle Over 100 30-500 Over 100 mm As per Attachment 3 35±5 As per Attachment 3 35±5 mm 3-5 3-5 3-5 3-5 1-3 1 for 50-70 mm of thickness 1-3 1 for 50-70 mm of thickness Number of electrode wires (nozzles) Welding electrode transverse vibration peed Mm/sec 9-10 - 9-10 - Welding electrode extreme position hold-up time sec 4-5 - 4-5 - Dry stick-out distance mm 50-70 - 40-50 - Consumable electrode plate thickness mm - 8-15 - 8-15 Amperage for one electrode wire A Up to 700 Up to 700 Up to 450 Up to 400 Slag bath voltage V 42-46 36-42 34-36 30-32 Welding speed for metal of thickness S, not more than Slag bath depth mm/sec 98/(300+S) 98/(300+S) 98/(300+S) 98/(300+S) mm 50-70 40-60 40-50 30-40 Cooling water temperature, not more than °С 60 60 60 60 Table П2.7. Automated hidden arc narrow grooving welding of perlitic steel (welded joint types 1-33, 1-34, 1-35, 1-36) Welding wire diameter, mm Amperage, A Arc voltage, V Welding speed, m/h 3 4 400-500 450-550 32-36 34-38 22-28 22-28 N o t e . It is preferable to use the electrode wire of 3 mm in diameter. Table П2.8. Automated argon-arc non-consumable electrode pulse welding for making the root bead of unturning butt welded joints of types 1-21, 1-25-1, 1-25-6 on pipes made of austenitic steel using welding machines ОДА, ГСМ and AT Nominal diame- Nominal pipe Arc burning time Distance between Pulse amter of welded wall thickness before welding welding electrode perage, A pipes, mm or dulling thick- electrode moves, and item (pre-set), mm ness, mm sec 14-38 Pulse duration, sec Pause duration, sec Welding electrode step length, mm Welding speed, mm/sec Welding electrode movement is uninterrupted 4.4-5.0 1 0.5 80-85 0.10-0.15 0.15-0.25 1.5 1.5 90-95 0.10-0.15 0.15-0.25 2 1.8 0.20-0.25 0.25-0.30 2.5 2.0 120-125 0.50-0.60 0.40-0.50 2.2-2.5 3 2.5 140-145 0.60-0.70 0.70-0.80 1.9-2.2 3.5 3.0 155-165 0.75-0.90 0.70-0.80 1.4-1.9 100-120 0.60-0.65 0.50-0.60 0.60-0.65 0.75-0.90 0.50-0.60 0.55-0.65 Step-bystep electrode movement 0.75-0.90 0.55-0.65 3 57-159 Pause amperage, A 0.8-1.2 3.0-4.0 3.5 4 3.0 3.0 4.5 4.0 1.0-1.5 105-110 120-130 140-155 150-165 6-8 25 2-2.4 3.1-3.3 2.8-3.3 Table П2.9. Automated argon-arc non-consumable electrode welding of unturning butt welded joints of types 1-25-1 on pipes made of austenitic steel using welding machines АДГ-201УХЛ4 and "Комета" Nominal diameter of welded pipes, mm Nominal pipe wall thickness, mm Bead number 57-76 4-4.5 57-108 5-6 7-9 1 2 1 2-3 1 2-4 1 2-4 1 2-6 1 2-9 6-7 133-159 8-10 14-17 Distance between Filler wire di- Amperage, A Arc voltage, V welding electrode ameter, mm and item (pre-set), mm 1-1.2 1.8-2.5 1-1.5 1.8-2.5 1-1.5 2-3 1-1.5 1.8-2.5 1-1.5 1.8-3.0 1-1.5 2-3 1.2 1.2-1.6 1.6 1.2-1.6 1.6 1.6 100-115 110-120 110-120 120-130 115-125 130-145 115-125 125-140 120-130 145-160 140-160 170-186 9-11 11-13 9-11 11-13 9-11 11-14 9-11 11-13 9-11 11-14 9-11 11-14 Welding speed, mm/sec Wire feeding speed, mm/sec Welding electrode vibration frequency, 1/min 1.7-2.1 1.9-2.2 1.8-2.1 1.7-1.9 1.8-2.1 1.7-1.9 1.5-1.8 1.5-1.9 1.7-1.9 1.7-1.9 1.7-1.9 1.9-2.2 5.0-6.1 4.2-5.6 5.0-6.1 4.2-4.7 4.4-5.6 5.6-6.9 60-70 60-70 50-60 60-70 50-60 40-50 Table П2.10. Automated argon-arc non-consumable electrode welding using the automatic pressure technique to fabricate unturning butt welded joints of type 1-21 on pipes made of austenitic steel without filler wire (except for root bead made in accordance with the modes given in Table 9) Nominal diame- Nominal pipe Distance between Amper- Arc voltage, V ter of welded wall thickness, welding electrode age, A pipes, mm mm and item (pre-set), mm 14-25 32-38 57-108 2 2.5 3 2.5 3 3.5 3 3.5 4 4.5 1.2-2 1.5-2.5 1.5-2.5 60-70 60-70 70-80 60-75 75-90 85-100 75-90 80-95 80-95 80-100 10-12 9.5-11 9-10.5 Welding speed, mm/sec Number of arc passes 2.5-2.8 2.5-2.8 2.5-2.8 2.5-2.8 2.8-3.1 2.8-3.1 3-6 3-6 2.8-3.1 2-6 Table П2.11. Automated argon-arc non-consumable electrode welding using the subsequent melting technique to fabricate unturning butt welded joints of types 1-21 on pipes made of austenitic steel without filler wire using welding machines ОДА, AT, ГСМ Nominal diame- Nominal pipe Distance between ter of welded wall thickness, electrode and pipes, mm mm item (pre-set), mm 14 18 25 32 32 38 38 2 2.5 2 3 3.5 3 3.5 0.8-1.2 Amperage, A 85-95 90-105 90-100 105-115 105-115 115-120 110-120 Arc voltage, V 8-10 Welding speed, mm/sec Number of uninterrupted arc passes 15.3-17.0 13.9-15.3 12.5-13.9 6.9-8.3 5.6-6.9 6.9-8.3 5.6-6.9 3 4 3 3 3 3 4 Table П2.12. Automated argon-arc non-consumable electrode welding to fabricate unturning butt welded joints of types 1-25-1, 1-25-6 on pipes made of austenitic steel with nominal diameter of 219 up to 560 mm and wall thickness of 10 up to 40 mm using welding machines АДГ-301УХЛ4 Weld bead (layer) number Filler wire diameter, mm Amperage, A base in pulse at edge Arc voltage, V Welding speed, mm/sec Wire feeding speed, mm/sec 1 - 145-160 2 1.2 3 Electrode vibra- Electrode lag time tion speed, at edge, sec mm/sec 145-160 8-9 1.7-1.8 - - - 125-145 150-160 9-10 0.8-1.0 3.6-4.2 2.5-3 1-1.4 1.6-2.0 155-170 180-190 9-10 0.8-0.9 5.6-6.9 2.5-2.8 0.8-1.1 4 and subsequent (except for two last layers) Last but one layer 1.6-2.0 170-220 200-240 9.5-11 0.7-0.8 6.1-8.9 2.5-2.8 0.8-1.1 1.6-2.0 160-200 190-220 9-10 0.6-0.7 4.2-6.9 2.5-2.8 0.7-1 Last layer 1.6-2.0 160-200 160-200 9-10 0.6-0.7 3.3-4.7 3.0-3.5 0.2-0.5 Table П2.13 Automated argon-arc non-consumable electrode welding to fabricate unturning butt welded joints of types 1-25-2 on pipes made of perlitic steel with nominal outer diameter of 219 up to 990 mm and wall thickness of 10 up to 65 mm using welding machine АДГ-301УХЛ4 Weld bead (layer) number Filler wire diameter, mm 1 Amperage, A Arc voltage, V Welding speed, mm/sec Wire feeding Electrode vibra- Electrode lag speed, tion speed, time at edge, mm/sec mm/sec sec base in pulse at edge - 150-160 150-160 9-10 0.7-0.8 - - - 2 1.2 I80-I90 200-210 9-10 0.7-0.8 5.0-6.9 2.5 0.7-0.9 3 1.6-2.0 200-220 220-240 10-11 0.6-0.7 4.2-5.6 2.5 0.9-1.1 4 and subsequent (except for two last layers) Last but one layer 1.6-2.0 210-230 240-260 10-11 0.6-0.7 5.0-8.3 2.5 0.9-1.1 1.6-2.0 200-210 220-240 10-11 0.6-0.7 5.0-6.4 3.0 0.8-1.0 Last layer 1.6-2.0 190-210 I90-210 9-10.5 0.6-0.7 4.2-5.6 3.0 0.7-0.9 Table П2.14. Tape electrode overlaying of corrosion resistant coating Overlaying mode parameters Arc voltage, V Flux.agent ОФ-10 Flux.agent ФЦ-18 32-36 32-36 Tape grade Tape section, mm Amperage, A Cв-07X25HI3 0.7х50 600-650 0.5х50 2(0.7х50)* 550-600 32-36 32-36 2.0-2.5 1100-1200 38-40 32-36 5.0-6.0 2(0.5х50)* 900-1000 38-40 32-36 4.2-4.5 Св-04Х20Н10Г2Б 0.7х50 650-700 32-36 32-36 2.2-2.8 (Св-08Х19Н10Г2Б) 0.5х50 600-650 32-36 32-36 2.0-2.5 2(0.7х50)* 1100-1200 38-40 32-36 5.0-6.0 2(0.7х50)* 2(0.5х50)* 1150-1250 38-40 32-36 4.2-5.0 950-1050 38-40 32-36 3.6-4.2 0.7х50 650-750 32-36 - 4.2-5.5 Нп-0ЗХ22Н11Г2Б Св-0ЗХ15Н35Г7М6Б * Overlaying using two tape welding electrodes set 10-14 mm apart from each other. Overlaying speed, mm/sec 2.2-2.8 Attachment 3 (recommended) MAIN TYPES OF WELDED JOINTS The following legend is used in the text of Attachment 3. For types of welded joints: 1 - butt, 2 - angle, 3 – tee-joint, 4 - edge. For welding techniques: 10 – automated hidden arc welding; 11 – automated hidden arc welding with preliminary root pass by manual arc coated electrode welding; 12 – automated hidden arc welding on steel backing; 20 – electroslag welding; 30 – manual arc coated electrode welding; 31 – manual arc coated electrode welding with root pass; 32 – manual arc coated electrode welding on steel backing; 40 – combined welding (weld root is made by argon-arc welding); 42 – combined welding on steel backing (weld root is made by argon-arc welding); 51 – argon-arc non-consumable electrode welding without filler metal; 52 – argonarc non-consumable electrode welding with filler metal; 53 – argon-arc consumable electrode welding. Tables П3.1-ПЗ.65 give two legends for a welded joint: the main one and bracketed one. The main legend should be used in the design documentation intended for application in the COMECON countries (including the USSR). It is permitted to use the bracketed legend only in the design documentation intended for application in the USSR. Table ПЗ.1 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S =S1, techmm nique 53 3 4 в, mm Nominal value 0 е =е1, mm Limiting deviation Nominal value ±0.5 ±0.8 8 10 5 1-01 (C-1) 10 6 7 8 9 g =g1, mm Limiting deviation Nominal value Limiting deviation ±3. 1.5 ±1.5 ±4 2.0 ±1.5 12 0 ±1.0 16 10 12 14 20 16 22 ±5 Table ПЗ.2 Welded joint legend Structural elements of prepared edges of the welded parts of weld 1-01-1 (C-1-1) Welding S =S1, techmm nique 51 3 4 5 52 6 40 8 е =е1, mm Nominal value 6 7 8 g =g1, mm Limiting deviation Nominal value Limiting deviation 1.0 ±0.5 ±1 1.5 10 Table ПЗ.3 Welded joint legend 1-01-2 (C-1-2) Structural elements of prepared edges of the welded parts of weld Welding S =S1, techmm nique 10 е, mm Nominal value 3 4 10 14 5 16 6 18 8 20 g, mm Limiting deviation Nominal value Limiting deviation 1.5 ±2 2.0 ±3 ±1 Table ПЗ.4 Welded joint legend 1-02 (C-2) Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 10 e, mm Nominal value 14 15 16 17 18 20 20 22 22 25 25 29 28 32 30 35 g, mm Limiting deviation Nominal value Limiting deviation ±4 2.0 ±1.5 ±5 2.5 +2.0 -1.5 ±6 2.5 +2.0 -1.5 Table ПЗ.5 Welded joint legend 1-02-1 (C-2-1) Structural elements of prepared edges of the welded parts of weld Welding S =S1, techmm nique 10 e, mm Nominal value 14 16 17 20 18 20 22 25 22 28 25 30 28 35 30 37 g, mm Limiting deviation Nominal value Limiting deviation ±4 2.0 ±1.5 ±5 2.5 +2,0 -1.5 ±6 2.5 +2,5 -1.5 Table ПЗ.6 Welded joint legend 1-03 (C-3) Structural elements of prepared edges of the welded parts of weld Welding S =S1, techmm nique 11 30 40 52 e, mm Nominal value g, mm Limiting deviation Nominal value Limiting deviation 14 16 18 25 27 30 ±5 2.5 +2.0 -1.5 20 22 25 33 35 40 ±6 2.5 +2.5 -1.5 28 45 30 47 32 50 ±8 3.0 +2.5 -2.0 36 54 40 60 Table ПЗ.7 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 10 1-03 (C-3) e =e1,mm Nominal value g =g1, mm Limiting deviation Nominal value Limiting deviation 20 22 25 15 17 19 ±4 2.0 ±1.5 28 32 36 40 21 23 26 28 ±5 2.5 +2.0 -1.5 45 50 55 32 35 38 ±6 2.5 +2.0 -1.5 60 43 ±8 3 +2.5 -2.0 Table ПЗ.8 Welded joint legend 1-05 (C-5) Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 10 e, mm Nominal value g, mm Limiting deviation Nominal value Limiting deviation 30 32 34 36 38 40 34 35 36 37 38 39 ±6 2.5 +2.5 -1.5 42 45 50 55 60 65 70 42 44 47 50 53 56 59 ±8 3.0 +2.5 -2.0 75 63 80 66 ±10 3.5 ±2.5 Table ПЗ.9 Welded joint legend Structural elements of prepared edges of the welded parts of weld 1-05-1 (C-5-1) Welding S =S1, techmm nique 30 For welded joints of parts made of austenitic steel e, mm Nominal value 30 32 34 36 38 35 36 37 38 39 40 42 45 50 55 60 65 70 75 80 42 44 47 49 52 54 58 61 65 68 g, mm Limiting deviation Nominal value Limiting deviation ±6 2.5 +2.5 -1.5 ±8 3.0 +2.5 -2.0 ±10 3.5 ±2.5 Table ПЗ.10 Welded joint legend 1-06 (C-6) Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 10 e=e1, mm Nominal value g=g1, mm Limiting deviation Nominal value Limiting deviation 50 55 60 65 70 34 35 37 38 40 ±6 2.5 +2.5 -1.5 75 80 90 100 110 120 130 43 44 47 50 53 56 59 ±8 3.0 +2.5 -2.0 140 150 64 67 ±10 3.5 ±2.5 Table ПЗ.11 Welded joint legend Structural elements of prepared edges of the welded parts of weld 1-06-1 (C-6-1) Welding S=S1, technique mm 10 For welded joints of parts made of austenitic steel e =e1, mm Nominal value g =g1, mm Limiting deviation Nominal value Limiting deviation ±6 2.5 +2.5 -1.5 50 55 60 65 70 35 37 38 40 43 75 80 90 100 110 120 130 44 47 50 53 56 59 64 ±8 3.0 +2.5 -2.0 140 150 67 70 ±10 3.5 ±2.5 Table ПЗ.12 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, technique mm 30 1-06-2 (C-6-2) e =e1, mm Nominal value g =g1, mm Limiting deviation Nominal value Limiting deviation 50 55 60 65 70 35 37 38 40 43 ±6 2.5 +2.5 -1.5 75 80 90 100 110 120 130 44 47 50 53 56 59 64 ±8 3.0 +2.5 -2.0 140 150 67 70 ±10 3.5 ±2.5 Table ПЗ.13 Welded joint legend 1-07 (C-7) Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 10 h, mm Nominal value Limiting deviation e, mm Nominal value e1, mm Limiting deviation Nominal value Limiting deviation Nominal value Limiting deviation ±5 2.5 +2.0 -1.5 ±6 2.5 +2.5 -1.5 ±8 3.0 +2.5 -2.0 100 15 85 30 120 20 90 34 140 25 160 30 102 39 180 35 108 44 200 40 ±0.1h 96 114 ±12 g1, mm 36 47 Table ПЗ.14 Welded joint legend 1-07 (C-7) Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 10 h, mm Nominal value e, mm Limiting deviation Nominal value e1, mm Limiting deviation Nominal value 180 40 82 48 200 45 88 50 220 50 240 55 97 54 260 60 102 56 280 65 107 58 300 70 112 60 350 80 120 64 ±0.1h 92 ±12 52 Limiting deviation ±8 Table ПЗ.15 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, techмм nique 10 30 1-09 (С-9) Gap between the “nib” and the welded part should exceed 2 mm. The option with backing ring or the plate. 1.“Nib”; 3. Backing ring (plate) 2. Root section to be removed by machining e, мм Nominal value 30 48 35 53 40 58 45 64 50 69 55 74 60 78 65 85 70 89 75 80 93 97 g, мм Limiting deviation Nominal value Limiting deviation ±8 3.0 +2.5 -2.0 ±10 3.5 ±2.5 ±12 4.0 ±3.0 Table ПЗ.16 Welded joint legend Structural elements of prepared edges of the welded parts 1-10 (C-10) 1.“Nib”; 3. Backing ring (plate) of weld Backing ring or plank option 2. Root section to be removed by machining Welding S =S1, techmm nique е =е1, mm g =g1, mm Nominal value Limiting deviation Nominal value 60 64 ±10 3.5 70 68 +2.5 -2.0 80 74 90 78 100 82 10 120 89 ±12 4.0 ±3.0 30 140 97 160 105 180 113 200 120 Limiting deviation Table ПЗ.17 Welded joint legend 1-11 (C-11) Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 11 30 40 52 e=e1, mm Nominal value 14 16 15 16 18 17 20 22 25 28 30 32 36 40 45 50 55 18 20 22 24 25 27 29 32 35 38 43 g=g1, mm Limiting deviation Nominal value Limiting deviation ±4 2.0 ±1.5 ±5 2.5 +2.0 -1.5 ±6 2.5 +2.5 -1.5 ±8 3.0 +2.5 -2.0 Table ПЗ.18 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, technique mm R, mm Nominal value e, mm Limiting deviation 30 35 40 1-12 (C-12) 11 30 40 Nominal value 32 35 6 46 55 53 8 Nominal value ±6 2.5 +2.5 -1.5 ±8 3.0 +2.5 -2.0 Limiting deviation 43 50 60 Limiting deviation 38 ±1 45 g, mm 56 Table ПЗ.19 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 1-13 (C-13) 11 30 40 e, mm Nominal value 60 48 65 70 50 52 75 80 54 56 g1, mm Limiting deviation Nominal value ±8 3.0 +2.5 -2.0 Limiting deviation 90 60 100 66 110 70 120 130 74 78 10 3.5 ±2.5 140 82 ±12 4.0 ±3.0 Table ПЗ.20 Welded joint legend 1-14 (C-14) 1-15 (C-15) Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique e, mm g, mm Nominal value Limiting deviation Nominal value Limiting deviation 2 7 ±2 1.5 ±1.0 30 3 8 53 4 9 3 10 31 4 11 ±3 2.0 +1.0 -1.5 40 52 53 5 12 6 15 ±4 2.0 ±1.5 ±3 Table ПЗ.21 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique b, mm Nominal value e, mm Nominal value Limiting deviation 12 ±3 15 ±4 2.0 ±1.5 27 ±5 2.5 +2.0 -1.5 20 34 ±6 25 42 ±8 30 49 Limiting deviation 5 7 2 ±1 10 1-16 (C-17) 31 40 g, mm 15 Nominal value Limiting deviation +1.0 -1.5 19 3 52 +2.0 -1.5 3.0 +2.5 -2.0 Table ПЗ.22 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, technique mm b, mm Nominal value e, mm Sn, mm Limiting deviation Nominal value Limiting deviation 4 6 32 8 Nominal value Limiting deviation 12 ±3 15 2 4 18 10 ±0.1 +1 25 42 15 29 53 18 34 20 36 25 Nominal value 5 3 Limiting deviation +1.0 2.0 -1.5 ±4 ±1.5 ±1,5 +2.0 -1.5 22 12 1-17 (C-16) g, mm 2.5 +2.5 -1.5 ±6 45 28 48 30 51 36 57 40 62 ±8 3.0 +2.5 -2.0 ±10 3.5 ±2.5 Table ПЗ.23 Welded joint legend Structural elements of prepared edges of the welded parts e=e1, mm of weld Welding technique 30 S=S1, mm Nominal value 14 16 16 17 18 19 20 20 22 22 25 24 28 26 30 27 32 28 36 31 40 33 45 37 50 40 55 44 g=g1, mm Limiting deviation Nominal value Limiting deviation ±4 2.0 ±1.5 40 1-18 53 (C-18) 52 60 48 +2.0 ±5 -1.5 2.5 +2.5 ±6 ±8 -1.5 +2.5 3.0 -2.0 Table ПЗ.24 Welded joint legend 1-19 Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 20 bр, mm Nominal value 20-34 22 35-80 26 R, mm Limiting deviation Nominal value e=e1, mm Limiting deviation - g=g1, mm Nominal value Limiting deviation Nominal value Limiting deviation 28 ±4 2.5 ±1.5 33 ±5 3.0 ±2.0 38 ±6 3.5 ±2.5 (C-19) ±2 ±1 81-500 30 20-34 22 10 28 ±4 2.5 ±1.5 35-80 26 12 33 ±5 3.0 ±2.0 81-500 30 14 38 ±6 3.5 ±2.5 1-20 (C-20) 20 Table ПЗ.25 Welded joint legend 1-21 Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 51 1.0 52 1.5 e, mm Nominal value g, mm g1, mm Limiting deviation Nominal value ±2 1.0 +1.0 -0.5 ±2 1.5 +1.0 -0.5 ±3 2.0 +1.5 -1.0 ±2 1.5 +1.5 -0.5 4 Limiting deviation Nominal value Limiting deviation 0.5 +1.0 -0.5 0.5 +1.0 -0.5 0.5 +1.0 -0.5 1.0 ±1.0 (C-21) 1-22 2.0 5 53 2.0 7 52 2.5 9 (C-22) 1-23 40 3.0 10 53 3.0 7 52 4.0 +1.5 -1.0 9 ±3 (C-23) 40 5.0 11 6.0 12 2.0 Table ПЗ.26 Welded joint legend Structural elements of prepared edges of the welded parts of weld 1-21-1 (C-21-1) Welding S=S1, techmm nique 51 52 For sheet thickness S=1÷2 mm it is permitted to use filler wire of d=1÷2 mm. 0,3 0,4 0,5 0,6 0,8 1,0 1,5 2,0 e, mm Nominal value g, mm Limiting deviation 4 ь, nn Not more than 0.2 3 g1, mm 0.2 +1 +2 0.3 0.4 0.8 1.0 0.25 0.3 0.4 0.5 0.1 0.2 Table ПЗ.27 Welded joint legend 1-21-2 (C-39) Structural elements of prepared edges of the welded parts of weld Welding technique 51 52 S=S1, mm e, mm Nominal Limiting value deviation 1.5 4 2.0 2.5 3.0 5 3.5 4.0 4.5 6 5.0 6.0 7.0 7 g, mm Nominal Limitvalue ing deviation ±2 1.5 ±3 ±1.0 Table ПЗ.28 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, technique mm 52 1-21-1 (C-22-1) 53 40 e, mm Nominal value Limiting deviation 1.5 2.0 6 7 ±2 2.5 3.0 3.5 8 9 10 ±3 g, mm g1, Nominal мм Limitvalue ing deviation 1.0 ±0.5 Table ПЗ.29 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique e, mm Nominal value 4 9 5 10 6 11 8 15 1-24 53 10 17 (C-18) 52 12 21 14 23 16 26 18 28 20 32 22 34 25 38 28 44 30 46 40 g, mm Limiting deviation Nominal value g1, mm Limiting deviation Nominal value Limiting deviation 0.5 +1.0 -0.5 1.0 ±1.0 1.0 +1.5 -1.0 +1.5 -1.0 ±3 2.0 +2.0 -1.0 ±4 ±5 +2.0 -1.5 2.5 +2.5 -1.5 ±6 ±8 3.0 +2.5 2.0 Table ПЗ.30 Welded joint legend 1-21-2 (C-39) Structural elements of prepared edges of the welded parts of weld Welding technique 51 52 S=S1, mm e, mm g1, mm Nominal value Limiting deviation 4 5 6 11 12 14 ±3 8 10 16 19 ±4 12 14 16 22 24 26 ±5 Nominal value Limiting deviation 1.5 +1.5 -1.0 2.0 +2.0 -1.5 Table ПЗ.31 Welded joint legend 1-24-2 (C-24-2) Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 40 51 52 e, mm Nominal value 4 10 5 11 6 12 8 17 10 19 12 24 14 27 16 30 18 32 20 37 22 40 25 44 28 51 30 53 g, mm Limiting deviation Nominal value g1, mm Limiting deviation Nominal value Limiting deviation 0.5 +1.0 -0.5 1.0 ±1.0 1.0 +1.5 -1.0 +1.5 -1.0 ±3 2.0 ±4 +2.0 -1.0 ±5 +2.0 -1.5 2.5 +2.5 -1.5 ±6 ±8 3,0 +2.5 2.0 Table ПЗ.32 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, technique mm 6 40 52 1-25 (C-25) e, mm Nominal value g, mm Limiting deviation Nominal value ±4 2.0 ±5 2.5 g1, mm Nominal value Limiting deviation +2.0 -1.0 1.0 ±1.0 +2.0 -1.5 1.0 +1.5 -1.0 Limiting deviation 15 8 16 10 18 12 20 14 21 16 22 18 23 20 24 22 26 25 28 28 30 30 32 ±6 +2.5 -1.5 Table ПЗ.33 Welded joint legend 1-25-1 (C-42) Structural elements of prepared edges of the welded parts of weld Welding technique 40 52 S=S1, mm e, mm Nominal value 4 5 6 10 11 12 8 10 12 16 18 20 13 14 16 18 20 23 26 28 30 34 36 40 28 31 33 37 40 44 g, mm Limiting deviation Nominal value ±3.0 1.0 +1.5 -0.5 ±4.0 1.5 +1.5 -1.0 ±5.0 2.0 +1.0 -1.5 N o t e . It is permitted to fabricate the root weld with melting insert as in Fig. 5. In doing so, the nominal value of "e" should be increased by 2 mm. Limiting deviation Table ПЗ.34 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm 13 14 15 16 17 19 20 ±4 40 6 8 10 12 14 16 20 26 28 30 23 24 25 ±5 1-25-2 (C-25-1) 52 e, mm Nominal value Limiting deviation g, mm g1, Nominal мм Limitvalue ing deviation N o t e . It is permitted to fabricate the root weld with melting insert as in Fig. 5. In doing so, the nominal value of "e" should be increased by 2 mm. 2.0 +2.0 -1.5 2.5 ±2.0 Table ПЗ.35 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique 40 1-25-3 (C-42-1) 52 S=S1, mm e, mm g, mm g1, Nominal мм Limitvalue ing deviation Nominal value Limiting deviation 6 8 10 11 ±3 1.0 +1.5 -0.5 10 12 16 18 20 12 14 16 18 21 ±4 1.5 +1.5 -1.0 26 28 30 34 36 40 26 29 31 35 38 42 ±5 2.0 +1.0 -1.5 Table ПЗ.36 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique 1-25-4 (C-25-2) 40 52 S=S1, mm e, mm Nominal value 6 8 10 12 14 11 12 13 14 15 16 20 17 18 26 28 30 22 23 24 Limiting deviation g, mm g1, Nominal мм Limitvalue ing deviation 2.0 +2.0 -1.5 2.5 ±2.0 ±4 ±5 Table ПЗ.37 Welded joint legend 1-25-5 (C-42-2) Structural elements of prepared edges of the welded parts of weld Welding technique 52 40 S=S1, mm e, mm Nominal value 8 10 12 14 16 18 20 11 12 13 14 15 16 17 26 30 34 40 18 19 20 21 Limiting deviation g, mm g1, мм LimitNominal value ing deviation ±3 1.5 ±1.0 ±4 Table ПЗ.38 Welded joint legend 1-25-6 (C-25-3) Structural elements of prepared edges of the welded parts of weld Welding technique 52 40 S=S1, mm e, mm Nominal value 8 10 12 16 18 20 12 13 14 15 16 17 26 28 19 21 Limiting deviation g, mm g1, Nominal мм Limitvalue ing deviation ±3 1.5 ±4 ±1.0 Table ПЗ.39 Welded joint legend 1-25-7 (C-27) Structural elements of prepared edges of the welded parts of weld Welding technique 30 40 S=S1, mm 38 40 42 45 50 55 60 65 70 e, mm Nominal value 27 28 29 30 31 33 35 37 39 Limiting deviation ±5 g, mm g1, Nominal мм Limitvalue ing deviation 2.5 +2.5 -2.0 3.5 +2.5 -3.0 Table ПЗ.40 Welded joint legend 1-25-8 (C-27-1) Structural elements of prepared edges of the welded parts of weld Welding technique 52 40 S=S1, mm 38 40 42 45 50 55 60 65 70 e, mm Nominal value 21 22 23 24 26 27 28 29 31 Limiting deviation g, mm g1, Nominal мм Limitvalue ing deviation 2.5 ±5 3.5 +2.5 -2.0 +2.5 -3.0 Table ПЗ.41 Welded joint legend Structural elements of prepared edges of the welded parts of weld Weld- S=S1, ing mm technique 11 30 Limiting deviation Nominal value 15 15 17 20 19 0 ±0.3 22 35 24 40 26 10 17 15 19 20 21 1.5 ±0.5 g,mm Limiting deviation Nominal value g1, mm Limiting deviation Nominal value Limiting deviation 1 ±1.0 +2 21 30 25 40 Nominal value E, mm 10 25 1-25-9 (C-27-2) b, mm +4 +2 23 30 24 35 26 40 28 +4 2 +2.0 -1.5 Table ПЗ.42 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm e, mm Nominal value g, mm Limiting deviation Nominal value Limiting deviation 52 3,0 10 +1.0 -1.5 ±3 1-26 (C-26) 42 3,5 11 32 4,0 12 2.0 4,5 13 ±4 5,0 14 ±1.5 Table ПЗ.43 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm 3.0 52 e, mm Nominal value g, mm Limiting deviation Nominal value g1, mm Limiting deviation Nominal value +1.5 -1.0 0.5 +1.0 -0.5 1.0 ±1.0 Limiting deviation 10 ±3 3.5 11 4.0 1-27 (C-40) 40 4.5 12 5.0 14 5.5 15 6.0 16 7.0 17 2.0 ±4.0 +2.0 -1.0 Table ПЗ.44 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, мм e, мм Nominal value g, мм Limiting deviation Nominal value ±3 2.0 g1, мм Limiting deviation Nominal value Limiting deviation 1.0 ±1.0 5.0 1-28 (C-28) 52 5.5 40 6.0 9 7.0 10 8.0 9.0 11 10.0 +1.5 -1.0 Table ПЗ.45 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, technique mm 30 e, mm Nominal value 2 7 3 8 4 Limiting deviation Nominal value Limiting deviation +3 1.5 ±0.5 9 1-28-1 (C-28-1) 1-perlitic steels (alloyed up to 6 mm); 2 –austenitic steels g, mm 5 10 6 14 8 18 10 22 Table ПЗ.46 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique 53 42 1-29 (C-29) 32 S=S1, mm 6 8 10 12 14 16 18 20 22 25 28 30 e, mm g, mm Nominal value Limiting deviation Nominal value Limiting deviation 18 20 22 24 25 26 28 29 30 32 34 35 ±4 2.0 ±1.5 +2.0 -1.5 ±5 2.5 ±6 +2.5 -1.5 Table ПЗ.47 Welded joint legend 1-29-1 (C-29-1) Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm e, mm Nominal value 6 20 8 22 32 10 24 42 12 26 14 27 16 28 18 30 20 31 22 32 25 34 28 36 30 37 g, mm Limiting deviation Nominal value Limiting deviation ±4 2.0 ±1.5 +2.0 -1.5 ±5 2.5 ±6 +2.5 -1.5 Table ПЗ.48 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm 6 e, mm Nominal value 15 8 17 53 10 21 42 12 23 14 26 16 29 18 32 20 34 22 37 25 43 28 46 30 49 1-30 (C-31) 32 g, mm Limiting deviation Nominal value Limiting deviation ±4 2.0 ±1.5 +2.0 -1.5 ±5 2.5 +2.5 -1.5 ±6 ±8 3.0 +2.5 -2.0 Table ПЗ.49 Welded joint legend 1-31 (C-30) Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 40 e, mm Nominal value 6 15 8 17 10 18 12 20 14 21 16 22 18 23 20 25 22 27 25 28 28 30 30 31 g, mm Limiting deviation Nominal value g1, mm Limiting deviation Nominal value Limiting deviation ±4 2.0 +2.0 -1.0 1.0 ±1.0 ±5 2.5 +2.0 -1.5 1.0 +1.5 -1.0 ±6 +2.5 -1.5 Table ПЗ.50 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm 8 1-32 (C-32) 40 e, mm Nominal value 19 9 20 10 22 12 23 14 24 16 25 18 26 20 27 22 29 25 30 28 33 30 34 g1 , mm g, mm Limiting deviation Nominal value ±4 2.0 ±5 2.5 ±6 Limiting deviation Nominal value Limiting deviation 1.0 ±1.0 1.0 +1.5 -1.0 +2.0 -1.0 +2.0 -1.5 +2.5 -1.5 Table ПЗ.51 Welded joint legend 1-33 (C-33) Structural elements of prepared edges of the welded parts of weld Welding technique 10 S=S1, mm e, mm Nominal value e1, mm Limiting deviation Nominal value 90 35 30 120 38 31 150 41 180 44 35 240 49 38 300 55 41 360 61 44 ±6 33 Limiting deviation ±5 Table ПЗ.52 Welded joint legend 1-34 (C-34) Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm e, mm Nominal value Limiting deviation Nominal value Limiting deviation 60 7 24 ±6 100 9 32 ±7 150 11 40 ±8 50 ±10 ±1 10 11 e1, mm 250 12 Table ПЗ.53 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 1-35 (C-35) 10 α, deg Nominal value B, mm Limiting deviation Nominal value Limiting deviation Nominal value Limiting deviation 40 3 9 20 ±5 60 2 14 25 ±6 100 2 18 32 ±6 ±1 Root section to be removed by machining e, mm ±1 150 2 22 40 ±8 250 2 24 50 ±10 Table ПЗ.54 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding S=S1, techmm nique 1-36 (C-36) 12 α, deg Nominal value B, mm Limiting deviation Nominal value e, mm Limiting deviation Nominal value Limiting deviation 40 3 9 20 ±5 60 2 14 25 ±6 100 2 18 32 ±6 150 2 22 40 ±8 250 2 24 50 ±10 ±1 ±1 Table ПЗ.55 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique 2-01 (У-1) S, mm S1, mm e, mm g, mm Nominal value Limiting deviation Nominal value Limiting deviation 10 19 ±4 2.0 ±1.5 12 22 +2.0 11 14 ≥0.75S 26 ±5 -1.5 31 16 29 18 32 40 2.5 ±6 20 35 +2.5 -1.5 Table ПЗ.56 Welded joint legend Structural elements of prepared edges of the welded parts of weld Weld- S=S1, h, mm ing mm Nominal Limittechvalue ing nique deviation 20 e, mm Nominal value 22 ±1 25 2-02 (У-2) 28 Limiting deviation Nominal value 25 7 10 g, mm 28 8 36 Limiting deviation Nominal value g1, mm Limiting deviation Nominal value -1.5 16 8 ±3 2.5 +2.5 ±6 18 9 -1.5 30 30 38 ±2 21 10 34 44 36 47 40 12 10 ±8 3.0 ±4 +2.5 -2.0 50 Limiting deviation +2.0 ±5 32 e1, mm 24 12 Table ПЗ.57 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm e, mm Nominal value 4 14 6 17 g, mm Limiting deviation Nominal value Limiting deviation 7 ±3 8 +3 -2 2-03 (У-3) 8 20 10 10 24 12 52 ±4 32 ±3 12 28 14 14 32 16 16 36 42 ±5 18 +4 -3 18 40 20 44 20 ±6 22 ±4 A layer of metal to be removed by machining Table ПЗ.58 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm e, mm Nominal value g, mm Limiting deviation Nominal value 4 14 7 6 17 8 8 20 10 10 24 12 ±3 52 +3 -2 ±4 2-04 Limiting deviation ±3 32 12 28 14 42 14 32 16 16 36 (У-4) ±5 18 +4 -3 18 40 20 44 20 ±6 22 ±4 A layer of metal to be removed by machining Table ПЗ.59 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique 2-03 (У-3) S=S1, mm e, mm Nominal value 4 5 5 6 6 8 8 11 g, mm Limiting deviation Nominal value Limiting deviation 5 +2 +2 6 +3 32 The size is established for each specific joint. The recommended ratio for the joint is D/D1≤0.4 10 14 8 12 17 9 14 20 10 16 23 11 18 26 20 28 +4 13 14 ±3 ±4 Table ПЗ.60 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S1, mm 4 e, mm Nominal value 7 6 10 8 14 e1, mm Limiting deviation Nominal value Limiting deviation ±2 6 ±2 16 12 20 31 14 24 40 16 26 Nominal value Limiting deviation 4 +2 -1 5 ±3 8 8 11 3-01 (T-1) g1, mm Nomi- Limiting nal deviavalue tion 3 7 10 10 g, mm 10 ±3 +3 -2 4 +2 -1 10 5 18 28 20 30 22 34 12 13 ±4 14 14 ±4 18 37 7 +3 -2 15 17 ±5 25 +4 -3 18 9 +5 -4 Table ПЗ.61 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm 10 e=e1, mm Nominal value g=g1, mm Limiting deviation 8 Nominal value Limiting deviation 4 +2 -1 ±2 3-02 (T-2) 10 15 12 20 15 25 18 30 23 6 7 ±3 9 11 ±4 40 30 50 37 60 44 70 52 80 60 30 90 67 33 100 74 ±5 15 18 +3 -2 +4 -3 +5 -4 22 ±6 ±8 26 37 +6 -5 +8 -6 Table ПЗ.62 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique 52 4-01 (У-6) S=S1, mm h, mm Nominal value 4-02 (У-7) Minimum distance between weld edges t is established by the design documentation. Nominal value 1.5 3.5 1.5 2.0 4.5 2.0 2.5 5.5 3.0 51 Limiting deviation 1.0 2.5 кумен е, mm ±0.2 g, mm Limiting deviation Nominal value Limiting deviation +1.5 -0.5 0.5 ±0.5 1.0 +1.0 -0.5 - - 6.5 3.0 7.0 1.0 3.0 1.5 3.5 2.0 4.0 2.5 4.5 3.0 5.0 +1.5 -0.5 +2.5 -0.5 Table ПЗ.63 Welded joint legend 4-03 (У-8) Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm e, mm Nominal value 1.0 3.0 1.5 3.5 2.0 4.0 2.5 4.5 3.0 5.0 Limiting deviation +1.5 51 -0.5 +2.5 -0.5 Table ПЗ.64 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S, mm h1, mm Nominal value R, mm Limiting deviation 1.0 Nominal value t, mm, not less than Limiting deviation 0.5 1.0 0.8 1.5 3.5 51 4-04 (У-9) 1.5 ±0.5 ±0.2 2.0 4.0 1.0 2.0 2.5 4.5 1.2 2.5 3.0 5.0 1.5 3.0 Table ПЗ.65 Welded joint legend Structural elements of prepared edges of the welded parts of weld Welding technique S=S1, mm 40 22 24 26 30 34 40 44 50 36 39 41 46 49 59 64 72 54 60 64 70 76 87 90 97 4-05 (У-10) e, mm Nominal value Limiting deviation g, mm g1, Nominal мм Limitvalue ing deviation +3 2.0 +2 -1 +3 3.0 ±2 FEDERAL STANDARDS AND RULES IN THE FIELD OF USE OF ATOMIC ENERGY AMENDMENT № 1 to PNAE G-7-009-89 “Equipment and Piping of Nuclear Power Installations. Welding and Overlaying Welding. Basic Provisions” Moscow 2000 Federal Nuclear and Radiation Safety Authority of Russia (GOSATOMNADZOR OF RUSSIA) FEDERAL STANDARDS AND RULES IN THE FIELD OF USE OF ATOMIC ENERGY Attachment to By Gosatomnadzor of Russia Order № 8 of December 27, 1999 AMENDMENT № 1 to PNAE G-7-009-89 “Equipment and Piping of Nuclear Power Installations. Welding and Overlaying. Basic Provisions” Effective since September 1, 2000 Moscow 2000 AMENDMENT № 1 to PNAE G-7-009-89 “Equipment and Piping of Nuclear Power Installations. Welding and Overlaying. Basic Provisions” Content of the Amendment: 1. Title page. 1) To replace the name of the federal executive body “The State Committee of the USSR for Supervision over Safe Conduct of Operations in Nuclear Power (Gosatomenergonadzor of the USSR)” with the name “The Federal Nuclear and Radiation Safety Authority of Russia (Gosatomnadzor of Russia)”. 2) The free space of the Title page of PNAE G-7-009-89 document below its title should have the wording: “Effective as amended, Amendment № 1 (see Gosatomnadzor of Russia Order № 8 of December 27, 1999). The following items were modified: paragraph 1.4; Table 4; paragraph 2.18; Table 10; paragraphs 9.13, 11.1-11.5; Section 13; Attachments 1, 3". 2. Paragraph 1.4. It should be read as follows: 1.4. Welding of materials, which are not indicated in these BP but permitted for use by the NPI Rules, is permitted in accordance with the PED developed by the manufacturing enterprise (assembling organization) taken into account the requirements of these BP as agreed with the leading material study organization and duly approved by Gosatomnadzor of Russia. It is permitted to apply the PED developed by the leading material study organization. Note. The Leading Material Study Organization is the organization acknowledged by a respective atomic energy use entity as the one to render services to a utility and other entities in selection of materials, welding, quality assurance of manufacturing of equipment and piping and to review design, engineering documentation and documents justifying nuclear and radiation safety of NPI, and the organization having a license for the relevant activities issued by Gosatomnadzor of Russia. The agreement of a leading material study organization should mean its positive conclusion. 3. Table 4. Welding materials for fabricating the welded joints of parts made of austenitic steel with the parts made of perlitic and high-chromium steels (except for welded joints of Categories Iн and IIн). Note. Paragraph 7. To replace the wording “the leading interagency material study organization” with the wording “the leading material study organization”. 4. Paragraph 2.18. 1) The first paragraph. To replace the wording “the leading interagency material study organization” with the wording “the leading material study organization”. 2) The third paragraph. To replace the wording “the leading interagency material study organization” with the wording “the leading material study organization”, then Paragraph 2.18 should read: 2.18. Tempering quality of each setting of welding electrodes H-10, fluxing agents KФ-I6 and КФ-27, as well as welding electrodes УОНИИ-13/45А and УОНИИ-13/55 to be used for welding of parts made of steel grade 10X2M among themselves and with parts made of perlitic steels, is determined by hydrogen content in the overlaid metal or weld metal in accordance with the methodology of the leading material study organization. At this, the hydrogen content in the overlaid metal (weld metal) in case of manual arc welding should not exceed 2.5 cm3 per 100 g, and in case of automated hidden arc welding it should not exceed 3.0 cm3 per 100 g. Should the results be negative the re-tempering of welding electrodes and fluxing agents is done followed by the determining of hydrogen content. It is allowed, upon agreement with the leading material study organization, to skip the determining of hydrogen content in the overlaid metal when individual batches of welding materials designated for welding of specific parts are checked. 5. Table 10. Recommended tempering modes for coated welding electrodes and fluxing agents. The footnote “It is permitted to reduce the tempering temperature down to 400±20 0С, as agreed upon with the leading interagency material study organization.” Should be read as follows: It is permitted to reduce the tempering temperature down to 400±20 0С, as agreed upon with the leading material study organization. 6. Paragraph 9.13. To replace wording "and Regional Office of Gosatomenergonadzor of the USSR" with the wording "and duly approved by Gosatomnadzor of Russia", then Paragraph 9.13 should read: 9.13. Elimination of defects on one and the same section of a welded joint or overlaid part is permitted only for three times. At this, the corrected section should mean a rectangle of a lest area, which fits the fall subject to welding, and the adjacent surfaces at a distance equal to three-time width of the said rectangle (Fig. 4). The issue concerning the correction of defects on one and the same section of the welded joints (overlaid part) in excess of three times should be resolved subject to an agreement with the leading material study organization and duly approved by Gosatomnadzor of Russia. 7. Section 11. Safety Requirements. To replace the title of the Section with the title “Safety-at-Work Requirements”. 8. Paragraphs 11.1 - 11.5. To delete the paragraphs. 9. Section 13. Deviation from Established Requirements. To replace the wording "and Gosatomenergonadzor of the USSR” with the wording “and approved by Gosatomnadzor of Russia”, then the Section 13 should read as follows: 13. Deviation from Established Requirements. Where it is technically or economically unreasonable to follow individual requirements of this document it is permitted to deviate from them provided there are justifications formalized in joint technical solutions made by the design organization and manufacturing enterprise (assembling organization) as agreed upon with the leading material study organization and approved by Gosatomnadzor of Russia. 10. Attachment 1 (reference). Reference book of regulatory and technical documentation for welding materials permitted for manufacturing, assembling and repair of equipment and piping of nuclear power installations Notes. Paragraph 1. To replace the wording “Gosatomenergonadzor of the USSR” with the wording "Gosatomnadzor of Russia", then paragraph 1 Notes should read: The documents marked with an asterisk are listed in the additional Reference Book of Gosatomnadzor of Russia. 11. Attachment 3 (recommended). Main Types of Welded Joints. The wording “Tables П3.1-ПЗ.65 give two legends for a welded joint: the main one and bracketed one. The main legend should be used in the design documentation intended for application in the COMECON countries (including the USSR). It is permitted to use the bracketed legend only in the design documentation intended for application in the USSR.” Should be replaced with the following: Tables П3.1 - П3.65 give two legends for a welded joint: the main one and bracketed one. For the design documentation to be used in Russia it is permitted to the bracketed legend. Regulatory document AMENDMENT № 1 to PNAE G-7-009-89 “Equipment and Piping of Nuclear Power Installations. Welding and Overlaying. Basic Provisions” Editor in charge Sinitsyna T.V. Computer design Zernova E.P., Tarasova V.P., Chenykaev D.M. Design by STID of SEC NRS of Gosatomnadzor of Russia Telephone: 275-0023 ext. 22-24