25783 version 1
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Demonstrate knowledge of metal cutting and gouging processes
Level
3
Credits
2
Purpose
This unit standard covers the principles of cutting and gouging metals using
the gas, plasma, and air carbon arc processes.
People credited with this unit standard are able to demonstrate: knowledge of
gas cutting and gouging, plasma arc cutting and gouging, and air carbon arc
gouging; and use of cutting and gouging equipment on steel.
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 21907, Demonstrate and apply
knowledge of safe welding procedures under
supervision, 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
Reference
Health and Safety in Welding. Wellington: Department of Labour, 2006. Available
from http://www.osh.govt.nz.
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2
Definitions
Gas cutting – refers to oxygen cutting using a fuel gas such as acetylene or liquid
petroleum gas (LPG).
Industry practice – safe and sound practices generally accepted by competent trade
persons within the fabrication industry.
Safe working practice – refers to formal worksite or company safety policies, or the
practices established by Health and Safety in Welding or similar codes.
3
The purpose of element 4 is to assess an initial familiarity with this type of equipment.
Full competence in cutting and gouging is covered in unit standards 2683 and 18106
respectively.
Elements and performance criteria
Element 1
Demonstrate knowledge of gas cutting and gouging.
Performance criteria
1.1
The principles of gas cutting and gouging are explained with reference to the
equipment used.
Range
equipment – gas cylinders, regulators, flashback, arrestors, hoses,
torch, tip, guides.
1.2
The applications, advantages, and disadvantages of gas cutting and gouging
are compared with the plasma arc and air carbon arc processes.
1.3
Cutting and gouging parameters and consumables are described for steel in
accordance with industry practice.
1.4
Typical faults are described in terms of cause, significance, and corrective
action.
Element 2
Demonstrate knowledge of plasma arc cutting and gouging.
Performance criteria
2.1
The principles of plasma arc cutting and gouging are explained with reference
to the equipment used.
Range
power source, gas supply, electrode, torch (tip, nozzle), guides.
2.2
The applications, advantages, and disadvantages of plasma arc cutting and
gouging are compared with the gas and air carbon arc processes.
2.3
Cutting and gouging parameters and consumables are described for steel,
stainless steel, and aluminium in accordance with industry practice.
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2.4
Typical faults are described in terms of cause, significance, and corrective
action.
Element 3
Demonstrate knowledge of air carbon arc gouging.
Performance criteria
3.1
The principles of air carbon arc gouging are explained with reference to the
equipment used.
Range
power source, torch, compressed air, electrode.
3.2
The applications, advantages, and disadvantages of air carbon arc gouging are
compared with gouging using the gas and plasma arc processes.
3.3
Gouging parameters and consumables are described for steel in accordance
with industry practice.
3.4
Typical faults are described in terms of cause, significance, and corrective
action.
3.5
Post-gouging cleanup processes are described in accordance with industry
practice.
Element 4
Demonstrate use of cutting and gouging equipment on steel.
Range
equipment may include – gas, plasma arc, air carbon arc. Evidence of use of
two types of equipment is required, demonstrating cutting and gouging.
Performance criteria
4.1
Equipment is checked and set up in accordance with industry practice.
4.2
Equipment is used in accordance with safe working practice.
4.3
Steel is cut and gouged in accordance with industry practice.
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.
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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.
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