NZQA registered unit standard
21907 version 2
Page 1 of 4
Title
Demonstrate and apply knowledge of safe welding procedures under
supervision
Level
2
Purpose
Credits
3
This unit standard is for use in entry level training of
mechanical engineering and related trades and covers welding
principles and safe practice under supervision at an
introductory level.
People credited with this unit standard are able to demonstrate
knowledge of welding principles, quality assurance, and safety;
and have demonstrated safe welding practice under
supervision.
Classification
Mechanical Engineering > Welding
Available grade
Achieved
Explanatory notes
1
This unit standard is concerned with welding at an introductory level under
supervision for people new to the industry, and does not cover welding to recognised
industry standards. For industry standard welding refer to unit standards at level 3
and above in the domain Welding.
2
References
Health and Safety in Employment Act 1992.
Health and Safety in Welding. Wellington: Department of Labour, 2006. Available
from http://www.osh.govt.nz/.
3
Definitions
GMAW – Gas Metal Arc Welding, also referred to as Metal Inert Gas (MIG) welding.
GTAW – Gas Tungsten Arc Welding, also referred to as Tungsten Inert Gas (TIG)
welding.
Instructions – includes manufacturers’ instructions, site instructions, and supervisor’s
instructions relating to safe and sound welding practice.
Safe working practice – refers to the practices established by Health and Safety in
Welding or equivalent codes of practice.
Worksite – may be a real welding worksite, or a realistically simulated worksite in a
training establishment.
Competenz
SSB Code 101571
© New Zealand Qualifications Authority 2010
NZQA registered unit standard
21907 version 2
Page 2 of 4
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of welding principles.
Evidence requirements
1.1
The terms soldering, brazing, and welding are distinguished and typical
applications stated.
1.2
Welding terminology is explained with reference to typical applications.
Range
1.3
butt weld, fillet weld, weld size (leg length and throat thickness),
fusion, penetration, weld profile (concave, convex).
The principles of different types of welding and cutting processes are outlined
with reference to typical applications.
Range
processes – resistance welding, oxyacetylene, manual metal arc,
GMAW, GTAW, thermal cutting.
Outcome 2
Demonstrate knowledge of welding quality assurance.
Evidence requirements
2.1
The principles of, and reasons for, basic welding quality assurance and
inspection are outlined.
Range
2.2
Factors affecting weld quality are identified.
Range
2.3
principles – welding procedures, welder qualification, welding
inspection.
welding procedure, welder skill.
Defective welds are identified by visual inspection in accordance with
instructions.
Range
Competenz
SSB Code 101571
concavity, undercut, undersized, porosity, non-metallic inclusions,
cracks.
© New Zealand Qualifications Authority 2010
NZQA registered unit standard
21907 version 2
Page 3 of 4
Outcome 3
Demonstrate knowledge of welding safety.
Evidence requirements
3.1
The source and nature of hazards associated with welding and cutting
processes are identified.
Range
electric shock, burns (arc radiation, heat), fumes, asphyxiation,
noise, hard and/or hot particles, chemical (cleaning, pickling, and
passivating agents), dust.
3.2
Techniques of dealing with welding hazards are outlined in accordance with
safe working practice.
3.3
The obligations of employees and employers under the Health and safety in
Employment Act 1992 are outlined.
Range
employees – responsibility for their own health and safety,
responsibility for ensuring their actions do not harm anyone else;
employers – elimination, isolation, or minimisation of hazards.
Outcome 4
Demonstrate safe welding practice under supervision.
Range
processes – oxyacetylene, manual metal arc, GMAW, GTAW.
Evidence of three processes is required, which together should cover simple
fillet and butt welds in flat positions, joining mild steel.
Evidence requirements
4.1
The worksite is checked for potential hazards.
Range
may include – confined space, presence of flammable and/or
explosive materials or containers, defective equipment, hot metal,
hard and/or hot particles.
4.2
Personal protective equipment is worn in accordance with safe working
practice.
4.3
Welding operations comply with safe working practice.
4.4
Welding plant and materials are checked and prepared for welding in
accordance with instructions.
Range
Competenz
SSB Code 101571
connections – hose, regulator, torch, cables, gas cylinder, as
appropriate to the process;
cable insulation; condition of welding torches and/or guns;
condition of parent material and filler metals.
© New Zealand Qualifications Authority 2010
NZQA registered unit standard
4.5
Metals are prepared and joined in accordance with instructions.
Range
4.6
21907 version 2
Page 4 of 4
mild steel sheet and sections in the 1.5 to 3.2mm thickness range.
Welds are sound and without obvious defects, as required for non-critical
applications.
Replacement information
This unit standard replaced unit standard 2670.
Planned review date
31 December 2014
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
22 September 2005
N/A
Rollover and
Revision
2
17 September 2010
N/A
0013
Accreditation and Moderation Action Plan (AMAP) reference
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA, or
an inter-institutional body with delegated authority for quality assurance, before they can
report credits from assessment against unit standards or deliver courses of study leading
to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Consent requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact Competenz qualifications@competenz.org.nz if you wish to suggest
changes to the content of this unit standard.
Competenz
SSB Code 101571
© New Zealand Qualifications Authority 2010