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Title / Use the oxy-acetylene process for welding and allied uses in the motor industry
Level / 3 / Credits / 4
Purpose / This unit standard is for people in the automotive industry who require skill in oxy-acetylene welding. People credited with this unit standard are able to: oxy-acetylene weld mild steel components in a fixed position on a vehicle or machine; bronze weld components using the oxy-acetylene flame; and join parts using low temperature brazing.
Classification / Motor Industry > Automotive Workshop Engineering
Available grade / Achieved
Entry information
Critical health and safety prerequisites / Unit 230, Repair and manufacture automotive components by oxy-acetylene gas welding, or demonstrate equivalent knowledge and skills.
Explanatory notes
1The following regulations and amendments are to be consulted and followed before welding or heating automotive components for repair or modification:
Transport (Vehicle Standards) Regulations, 1990.
2The following legislation and amendments are to be consulted and followed where applicable:
Health and Safety in Employment Act, 1992.
3Reference to suitable equipment and material means industry approved equipment and material that are recognised within the industry as being the most suited to complete the task to a professional and competent manner with due regard to safe working practices.
Outcomes and evidence requirements
Outcome 1
Oxy-acetylene weld mild steel components in a fixed position on a vehicle or machine.
Rangevertical weld, overhead weld.
Evidence requirements
1.1Safe working practices are observed throughout the task.
Rangepersonal safety, safety of others, equipment and vehicle safety.
1.2The components are prepared to ensure a sound basis for welding.
Rangeremoval of rust and scale, abutting ends square, suitable gap between the joint edges where full root penetration is required, components positioned in-situ.
1.3Heat shielding of adjacent vehicle or machine components is carried out to prevent any damage and risk of fire and explosion.
1.4The components are welded in the desired position.
Rangesafety precautions taken, appearance of weld bead, full root penetration where required, no lack of fusion, no pin holes, parent metal not undercut, no excessive filler deposits (more than 1.5 mm above original surface), no leakage occurring through the weld.
1.5The welding equipment is stored safely after use.
Rangeprevention of damage to equipment and injury to people.
Outcome 2
Bronze weld components using the oxy-acetylene flame.
Evidence requirements
2.1Safety precautions are followed throughout the welding process.
Rangesafety of the operator, the plant, nearby personnel.
2.2Suitable equipment and material are selected and used to enable components to be bronze welded.
2.3Preparatory work on the components is carried out to ensure a sound basis for welding.
Rangecleanliness, joint preparation, pre-heating, positioning of components.
2.4The welding operation is completed having full root penetration, neat appearance, and minimal distortion of the components.
Rangewelding operation – protection of the components, pre-heating, flux application and metal tinned, heat localised, welding technique used, precautions against fumes, post-heating, cooling of the job.
2.5Bronze overlay allows a layer of 1.5 mm minimum of bronze.
2.6A rebuilt hole is dressed and drilled to the original size.
Outcome 3
Join parts using low temperature brazing.
Rangebrazing in the temperature range 600-850°C using filler metals consisting of predominantly silver and copper.
Evidence requirements
3.1Safety precautions are followed throughout the brazing process.
Rangesafety of the operator, the plant, nearby personnel.
3.2Suitable equipment and material are selected and used to enable components to be brazed.
3.3Preparatory work on the parts is carried out to ensure a sound basis for welding.
Rangejoint design, cleanliness, joint gap within the range 0.04 – 0.25 mm.
3.4The brazing operation is completed having neat appearance and minimal distortion of the components.
Rangejoint appearance, strength, ductility, finish.
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 October 1993 / 31 December 2016
Review / 2 / 4 October 1996 / 31 December 2016
Review / 3 / 26 February 1999 / 31 December 2016
Review / 4 / 20 March 2008 / 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 http://www.nzqa.govt.nz/framework/search/index.do.
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 2019