2691 version 6
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Cut metals using mechanised thermal cutting equipment
Level
4
Credits
4
Purpose
This unit standard covers the cutting of metal profiles using mechanised
thermal cutting equipment based on the oxyfuel or plasma arc processes.
People credited with this unit standard are able to: prepare to cut metals
using mechanised thermal cutting equipment; cut profiles using mechanised
thermal cutting equipment; and control quality of the cut.
Subfield
Mechanical Engineering
Domain
Welding
Status
Registered
Status date
22 May 2009
Date version published
22 May 2009
Planned review date
31 December 2014
Entry information
Recommended: Unit 2683, Cut metals using manual
thermal processes, or demonstrate equivalent
knowledge and skills.
Accreditation
Evaluation of documentation and visit by NZQA.
Standard setting body (SSB)
Competenz
Accreditation and Moderation Action Plan (AMAP) reference
0013
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
References
Health and Safety in Welding. Wellington: Department of Labour, 2006. Available
from http://www.osh.govt.nz.
WTIA Technical Note 5, Flame cutting of steels. Welding Technology Institute of
Australia, 1994. Available from Heavy Engineering Research Association, PO Box
76134, Manukau City, Manukau 2241.
 New Zealand Qualifications Authority 2016
2691 version 6
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Definitions
Industry practice – refers to the safe and sound practices accepted by the fabrication
industry.
Industry standard – Table 11 of WTIA Technical Note 5, or worksite equivalent.
Safe working practice – refers to formal worksite or company safety policies, or the
practices established by Health and Safety in Welding or similar codes.
Metals – weldable grades of steel, stainless steel, aluminium.
Worksite procedure – refers to a written work instruction providing all the necessary
technical detail for a specific cutting application.
3
Machines for thermal cutting may employ oxyfuel or plasma arc processes. They
may be of the portable (creeper) unit, radial arm, cross carriage, or other type.
Evidence of setting up and cutting on one machine using either process is sufficient
for assessment purposes.
Elements and performance criteria
Element 1
Prepare to cut metals using mechanised thermal cutting equipment.
Performance criteria
1.1
Work area is assessed for hazards associated with the thermal cutting and all
necessary precautions taken in accordance with safe working practice.
Range
electric shock, arc radiation, fire, explosion, fumes and gases,
heat, confined space, hot metal.
1.2
The equipment is set up and maintained in accordance with manufacturers’
instructions and worksite procedures.
1.3
Gases are identified by composition or specification as suitable for cutting.
1.4
Metal is positioned and supported for cutting in accordance with industry
practice.
1.5
Cutting parameters are established to industry standard or manufacturers’
instructions.
Range
1.6
nozzle size, gas pressures, flame type, travel speed, current type,
electrode.
Distortion control procedures are implemented in accordance with industry
practice and job instructions.
Range
cutting sequence, locking of scrap, stack cutting.
 New Zealand Qualifications Authority 2016
2691 version 6
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Element 2
Cut metals using mechanised thermal cutting equipment.
Range
metal thickness – 3 to 12 mm.
Performance criteria
2.1
Safety procedures are followed and personal protective equipment is worn in
accordance with safe working practice.
2.2
Profiles are cut to industry standard and in accordance with industry practice.
2.3
Nesting is used to minimise wastage in accordance with industry practice.
Element 3
Control quality of the cut.
Performance criteria
3.1
Cuts are compared to quality requirements of industry standard by visual
examination.
Range
3.2
typical imperfections – surface roughness, top edge condition, slag
adherence, edge profile.
The causes of imperfect welds are identified and cutting parameters are
adjusted to correct the imperfections.
Range
typical causes – surface condition, material defects, work support,
machine stability, accuracy of guidance system, cutting
parameters.
Please note
Providers must be 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 accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation 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.
 New Zealand Qualifications Authority 2016
2691 version 6
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Comments on this unit standard
Please contact Competenz qualifications@competenz.org.nz address if you wish to
suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016