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Elements and Performance Criteria

1. Prepare materials for gas metal arc welding (GMAW)
   • Weld requirements are identified from specifications and/or drawings.
   • Material is correctly prepared.
   • Materials are assembled/aligned to specification where required.
2. Select welding components
   • Welding machine settings accessories and consumables are identified.
3. Assemble and set up welding equipment
   • Welding equipment is assembled and set up.
4. Minimise and rectify distortion
   • Distortion prevention measures are selected appropriate to material and process.
   • Distortion is rectified.
5. Weld to job specification using GMAW
   • Weld deposit is to specifications.
   • Joints are cleaned to specifications.
6. Ensure weld conformance
   • Weld joints are visually inspected for conformance to specifications.
   • Defects are removed with minimum loss of sound metal using correct and appropriate techniques and tools.
7. Maintain weld records as required
   • Weld records are completed correctly.

Required Skills

Evidence Required

The evidence guide specifies the evidence required to demonstrate achievement in the unit of competency as a whole It must be read in conjunction with the unit descriptor performance criteria range statement and the assessment guidelines for the Metal and Engineering Training Package
Overview of assessment requirements	A person who demonstrates competency in this unit must be able to prepare materials select and set up the welding equipment carry out GMAW welding and inspect for and correct defects Competency in this unit cannot be claimed until all prerequisites have been satisfied
Context of assessment	This unit may be assessed on the job off the job or a combination of both on and off the job Where assessment occurs off the job that is the candidate is not in productive work then an appropriate simulation must be used where the range of conditions reflects realistic workplace situations The competencies covered by this unit would be demonstrated by an individual working alone or as part of a team The assessment environment should not disadvantage the candidate
Interdependent assessment	This unit could be assessed in conjunction with any other units addressing the safety quality communication materials handling recording and reporting associated with welding using gas metal arc welding process or other units requiring the exercise of the skills and knowledge covered by this unit
Method of assessment	Assessors should gather a range of evidence that is valid sufficient current and authentic Evidence can be gathered through a variety of ways including direct observation supervisors reports project work samples and questioning Questioning techniques should not require language literacy and numeracy skills beyond those required in this unit of competency The candidate must have access to all tools equipment materials and documentation required The candidate must be permitted to refer to any relevant workplace procedures product and manufacturing specifications codes standards manuals and reference materials
Consistency of performance	Assessors must be satisfied that the candidate can competently and consistently perform all elements of the unit as specified by the criteria including required knowledge and be capable of applying the competency in new and different situations and contexts
Required skills	Look for evidence that confirms skills in
	identifying and interpreting appropriate standard eg Australian Standard General Purpose American Bureau of Shipping ABS or equivalent
	selecting and using appropriate tools and equipment
	using a variety of welding machines and electrodes
	identifying and rectifying weld defects
	applying techniques for distortion prevention and rectification
	cleaning welds
	reading and interpreting information on written job instructions specifications standard operating procedures and drawings
	recording routine information related to GMAW onto proformas and standard workplace forms
	following oral instructions
	measurement skills relating to joint preparation and GMAW
Required knowledge	Look for evidence that confirms knowledge of
	types of gases and their uses
	the relationships between amperagewire feed voltage gas flow electrode and material
	the application of weld metal transfer short arc spray etc
	correct welding machine leads hand pieces and electrodes
	material preparation
	joint preparations
	electrode classification
	causes of distortion for materials within the scope of this unit
	safe welding practices
	use and application of personal protective equipment for GMAW

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Range Statement

The range statement provides information about the context in which the unit of competency is carried out. The variables and scope cater for different work requirements, work practices and knowledge between States, Territories and the Commonwealth, and between organisations and workplaces. The range statement relates to the unit as a whole and provides a focus for assessment. Text in italics in the performance criteria is explained here. The following variables may be present and may include, but are not limited to, the examples listed under the scope. All work is undertaken to relevant legislative requirements, where applicable
Variable	Scope
Weld	Fillet and butt in all positions, vertical, horizontal, overhead
Prepared	Preparation of materials including preheating, setting up of jigs, fixtures, clamps, etc., joint preparation e.g. bevelling
Equipment	AC or DC welding machines
Distortion prevention measures	Distortion prevention including preheating, setting up of jigs, fixtures, clamps, etc.
Rectified	Oxy acetylene, air arc equipment and grinding devices
Defects	Porosity, slag inclusions, discontinuities, lack of penetration, undercut

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