Application

This unit of competency was developed for post trade engineering fabrication trade training and the recognition of post trade skills in applying basic metallurgy principles to welding applications.
It defines the skills and knowledge required to support a range of advanced welding functions including welding inspection, welding supervision, advanced weld repair and coded welding associated with welding processes and procedures covered by Australian and international welding and related standards and codes as defined in the unit in conjunction with its prerequisites.
The unit scope includes applying knowledge of the general structure of metals and alloys, weldability, welding faults, and the effects of heat treatment of metals and alloys and the interaction of metals and alloys with other materials and consumables used in welding to decisions affecting welding applications.
This unit must be selected in combination with one of the following units:
• MEM05079 Perform welds to code standards using flux core arc welding process
• MEM05080 Perform welds to code standards using gas metal arc welding process
• MEM05081 Perform welds to code standards using gas tungsten arc welding process
• MEM05082 Perform pipe welds to code standards using manual metal arc welding process
• MEM05083 Perform welds to code standards using manual metal arc welding process
• MEM05088 Perform welds to code standards using oxy fuel gas welding process
• MEM05069 Undertake advanced weld repair and maintenance.
No licensing, legislative or certification requirements apply to this unit at the time of publication.
Band: B
Unit Weight: 8

What You'll Learn

Assessment Requirements

Performance Evidence

Evidence required to demonstrate competency in this unit must be relevant to and satisfy the requirements of the elements and performance criteria and include the ability to:
• confirm the weldability of at least one grade each of carbon steel and stainless steel, aluminium or an aluminium alloy, and one other non-ferrous metal or alloy
• monitor and identify factors that could adversely affect heat input on deposited metal
• monitor and identify the factors associated with the heat affected zone that could adversely affect the welding of at least two of carbon and low alloy steels, stainless steels, aluminium, and nickel, copper and manganese metal and alloys.
Note: Where a volume and/or frequency is not specified, demonstration must be provided at least once.

Knowledge Evidence

Evidence required to demonstrate the required knowledge for this unit must be relevant to and satisfy the requirements of the elements and performance criteria and include knowledge of:
• parameters used for the grouping of base metals
• microstructures of common ferrous and non-ferrous metals and alloys
• iron-carbon diagram and its use in welding and related processes
• the classification of carbon, manganese and low alloy steels
• effects of common alloying elements on material properties and weldability
• mechanical properties of carbon and low alloy steels including hardness and ductility
• factors affecting base metal quality
• factors affecting the weldability of carbon and low alloy steels
• weld defects in carbon and low alloy steels including:
• distortion
• lack of fusion
• penetration defects including incomplete root penetration, lack of root fusion, lack of inter-run fusion, lack of side wall fusion
• inclusions
• porosity
• fatigue
• intergranular and stress corrosion
• cracking including solidification cracking, hydrogen heat affected zone cracking, and reheat cracking
• factors affecting weldability of alloy, quenched and tempered steels including:
• welding zones
• microstructures of base and filler metals and implications for welding
• carbon equivalence
• hydrogen content and control
• residual stress avoidance
• weld preheat temperatures.
• cold cracking including test methods for susceptibility
• factors affecting the weldability of stainless steels
• factors affecting the weldability of aluminium and aluminium alloys
• weldability of non-ferrous metals and their alloys including copper, nickel, magnesium
• weldability of cast irons
• causes and control of distortion in welding including the relationship between a material’s coefficient of thermal expansion per unit volume of heat and distortion
• types of electrodes used in welding and their classification
• effects of moisture on electrode performance
• potential sources of hydrogen and effects of hydrogen diffusement in welding
• hydrogen control techniques for welding processes
• methods of residual stress control including welding technique, peening, heat treatment,
• the basic metallurgical changes that occur in carbon steel during normalising
• heat treatment methods including normalising, annealing, quenching, stress relieving, tempering, pre-heating, and post weld heat treatment
• shielding gases and their application to welding processes
• sources for further metallurgical professional and technical advice
• welding terminology including codes and symbols.

Assessment Conditions

• Assessors must:
• have vocational competency in applying basic metallurgy principles to welding applications at least to the level being assessed
• satisfy the assessor requirements in the Standards for Registered Training Organisations 2015 or its replacement and comply with the National Vocational Education and Training Regulator Act 2011, its replacement or equivalent legislation covering VET regulation in a non-referring state/territory as the case requires.
• Assessment must occur in a functioning workplace. Where assessment in the workplace would be unsafe, impractical or threatens the environment, assessment must occur in a sufficiently rigorous simulated environment that reflects the circumstances that would be experienced in a functioning workplace. Assessment must cover all aspects of workplace performance, including task skills, task management skills, contingency management skills and job role environment skills.
• Reports required to be provided by the applicant can be either reports on actual welded fabrications or test pieces.
• Knowledge assessment may be either verbal or written but must adequately reflect the knowledge requirements of the unit in a functioning workplace.
• Conditions for assessment must include access to all tools, equipment, materials and documentation required, including relevant workplace procedures, product and manufacturing specifications.
• Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate.

Foundation Skills

• {'skill': 'Foundation Skills', 'description': 'This section describes those language, literacy, numeracy and employment skills that are essential to performance.\nFoundation skills essential to performance are explicit in the performance criteria of this unit of competency.'}

Prerequisite Units

• MEM11011
• MEM12023
• MEM12024
• MEM13015
• MEM14006
• MEM16006

Parent Qualifications

• MEM40119 — Certificate IV in Engineering
  MEM

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