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Title / Use and maintain a metal-arc gas shield (MIG) welding plant in the motor industry
Level / 4 / Credits / 5
Purpose / This unit standard is for people who work in the motor industry. Those credited with this unit standard are able to: demonstrate knowledge of a MIG welder; MIG weld steel; and maintain a MIG welder.
Classification / Motor Industry > Panelbeating
Available grade / Achieved
Entry information
Recommended skills and knowledge / Unit 5743, Identify the characteristics, uses, and the effect of heat on metals in the motor industry, or demonstrate equivalent knowledge and skills.
Explanatory notes
1The following legislation and regulations (and subsequent amendments) are relevant to this unit standard and must be followed where applicable:
Health and Safety in Employment Act, 1992.
2When the evidence requirements state 'company guidelines', it is assumed that it is to the same standard as the product and vehicle manufacturers' standards.
3Unit standard applies to welding steel in the, overhead, vertical up and down, and horizontal positions.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of a MIG welder.
Evidence requirements
1.1Principle of how a MIG welder works is identified according to manufacturer's specifications.
Rangeproducing heat for welding, the wire drive system operation, transferring the current from the power source and producing the arc, gas shielding, earthing principles.
1.2Power supply and capacity ratings are identified according to manufacturer's specifications.
Rangeamperage rating, duty cycle.
1.3Shielding gases used for different metals are identified according to manufacturer's specifications.
Rangeargon, helium, oxygen, carbon dioxide CO 2;
coated steel, mild steel, high strength steel (HSS).
1.4Electrode wires are identified according to manufacturer's specifications.
Rangemetal gauge;
coated steel, mild steel, high strength steel (HSS).
1.5Types of joints used when welding damaged vehicles are identified according to vehicle manufacturer's specifications and company guidelines.
Rangelap joint, offset butt joint, butt joint with insert, plug.
1.6Effects of MIG welding on vehicle electronics are identified according to manufacturer's specifications.
1.7Safety precautions are identified according to the manufacturer's specifications and company guidelines.
Rangepersonal safety; safety of other people; vehicle safety; workshop safety; environmental safety; tool, equipment, and machine safety.
Outcome 2
MIG weld steel.
Rangebutt, butt with gap, tack, fillet, lap, and plug welds.
Evidence requirements
2.1MIG welder is set up according to manufacturer's specifications and company guidelines.
2.2Metal is prepared for welding according to manufacturer's specifications and company policy.
Rangeno contaminants on the surface to be welded, abutting ends square, suitable gap between joint edges, metal positioned securely, holes drilled for plug welding, anti-corrosion primer.
2.3Heat shielding of adjacent vehicles, tools, and machine components is carried out according to company guidelines, and they are not damaged.
2.4The metal is welded in position according to the manufacturer's specifications and company guidelines.
Rangeno undercutting, no sign of porosity, full penetration, consistent width and height, neat appearance, maximum of 3.00 mm distortion.
2.5Safe working practices are carried out throughout the task.
Rangepersonal safety; safety of other people; vehicle safety; workshop safety; environmental safety; tool, equipment, and machine safety.
2.6Welding equipment is shut down after use and put away according to manufacturer's instructions and company guidelines, with no damage to equipment, electronics, or injury to people.
Rangegas shut off, power leads disconnected, plant stored in a safe place.
Outcome 3
Maintain a MIG welder.
Evidence requirements
3.1Safe working practices are carried out throughout the task.
Rangepersonal safety; safety of other people; vehicle safety; workshop safety; environmental safety; tool, equipment, and machine safety.
3.2MIG welder is maintained according to manufacturer's specifications.
Replacement information / This unit standard and unit standard 914 have been replaced by unit standard 23992.This unit standard is expiring. Assessment against the standard must take place by the last date for assessment set out below.
Status information and last date for assessment for superseded versions
Process / Version / Date / Last Date for AssessmentRegistration / 1 / 29 January 1996 / 31 December 2016
Review / 2 / 20 December 1998 / 31 December 2016
Revision / 3 / 16 October 2003 / 31 December 2016
Review / 4 / 26 November 2007 / 31 December 2020
Rollover / 5 / 19 November 2010 / 31 December 2020
Rollover / 6 / 22 August 2014 / 31 December 2020
Consent and Moderation Requirements (CMR) reference / 0014
This CMR can be accessed at
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA, 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.
Requirements for consent to assess and an outline of the moderation system that applies to this standard are outlined in the Consent and Moderation Requirements (CMR). The CMR 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.
NZ Motor Industry Training Organisation (Incorporated)SSB Code 101542 / New Zealand Qualifications Authority 2018