Unit of competency details

MEM05015C - Weld using manual metal arc welding process (Release 1)


Usage recommendation:
Is superseded by and equivalent to MEM05015D - Weld using manual metal arc welding processWeld using manual metal arc welding process 20/Jun/2007

ReleaseRelease date
1 1 (this release) 19/Jun/2007


SchemeCodeClassification value
ASCED Module/Unit of Competency Field of Education Identifier 030711 Boilermaking And Welding  

Classification history

SchemeCodeClassification valueStart dateEnd date
ASCED Module/Unit of Competency Field of Education Identifier 030711 Boilermaking And Welding  04/Apr/2002 
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Modification History

There are no notes for this unit.

Unit Descriptor

This unit covers preparing materials, selecting and setting up the welding equipment, carrying out the manual metal arc welding (MMAW), and inspecting for and correcting defects, in a range of fabrication activities.

Application of the Unit

This unit applies to welds associated with heavy or light fabrication: fillet and butt welds in all positions on a range of materials that may include carbon steel or stainless steel. Weld quality would typically conform to Australian Standard 1554 General Purpose, American Bureau of Shipping (ABS) or equivalent.

Licensing/Regulatory Information


Path 1

MEM05012C Perform routine manual metal arc welding

MEM05051A Select welding processes

MEM05052A Apply safe welding practices

MEM12023A Perform engineering measurements

MEM18001C Use hand tools

MEM18002B Use power tools/hand held operations

Employability Skills Information

Elements and Performance Criteria Pre-Content

Elements are the essential outcomes of the unit of competency.

Together, performance criteria specify the requirements for competent performance. Text in italics is explained in the range statement following.

Elements and Performance Criteria

Elements and Performance Criteria 


Performance Criteria 


Prepare materials for manual metal arc welding (MMAW)


Weld  requirements are identified from specifications and/or drawings.


Materials  are correctly prepared .


Materials are assembled/aligned to specification, where required.


Select welding equipment


Welding equipment  and electrodes are identified.


Assemble and set up welding equipment


Welding equipment is assembled and set up.


Minimise and rectify distortion


Appropriate distortion prevention  measures are selected.


Distortion is rectified .


Weld to job specification using MMAW


Weld deposit is to specification.


Joints are cleaned to specifications.


Ensure weld conformance


Defects  are rectified with minimum loss of sound metal using correct techniques and tools.


Weld joints are visually inspected for conformance to specifications.


Where required, maintain weld records


Where required, weld records are completed correctly.

Required Skills and Knowledge

Evidence Guide

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 manual metal arc welding and inspect for and correct defects, in a range of fabrication activities. 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 manual 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, supervisor's 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 standards e.g. Australian Standard 1554 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 MMAW onto proformas and standard workplace forms

following oral instructions

measurement skills relating to joint preparation and MMAW

Required knowledge 

Look for evidence that confirms knowledge of:

material preparation

joint preparations

electrode classification

causes of distortion for materials within the scope of this unit

causes of defects and methods of rectification

the relationships between amperage, electrode and material

safe welding practices

use and application of personal protective equipment for MMAW

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




Welds would be fillet and butt in all positions


Materials used would include carbon or stainless steel


Preparation of materials including preheating, setting up of jigs, fixtures, clamps, etc., joint preparation e.g. bevelling


AC or DC welding machines

Distortion prevention measures 

Include preheating, setting up of jigs, fixtures, clamps, etc.


Remedial action using thermal processes including oxy acetylene and air arc equipment

Grinding devices may also be used


Porosity, slag inclusions, discontinuities, lack of penetration, undercut

Unit Sector(s)



Competency field


Related units

Where thermal processes are required, the appropriate specialisation units should be selected.

Unit Weight