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Evidence Guide: MEM05019C - Weld using gas tungsten arc welding process

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

MEM05019C - Weld using gas tungsten arc welding process

What evidence can you provide to prove your understanding of each of the following citeria?

Prepare materials for gas tungsten arc welding (GTAW)

  1. Weld requirements are identified from specifications and/or drawings.
  2. Material is correctly prepared.
  3. Materials are assembled/aligned to specification, where required.
Weld requirements are identified from specifications and/or drawings.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Material is correctly prepared.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Materials are assembled/aligned to specification, where required.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Select welding machine components

  1. Welding machine settings, accessories and consumables are identified.
Welding machine settings, accessories and consumables are identified.

Completed
Date:

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Assemble and set up welding equipment

  1. Welding equipment is assembled and set up.
Welding equipment is assembled and set up.

Completed
Date:

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Minimise and rectify distortion

  1. Appropriate distortion prevention measures are selected for weld and material type.
  2. Distortion is rectified.
Appropriate distortion prevention measures are selected for weld and material type.

Completed
Date:

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Distortion is rectified.

Completed
Date:

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Weld to job specification using GTAW

  1. Weld deposit is to specifications.
  2. Joints are cleaned to specifications.
Weld deposit is to specifications.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Joints are cleaned to specifications.

Completed
Date:

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Ensure weld conformance

  1. Defects are removed with minimum loss of sound metal using techniques and tools appropriate to the defect, material and process.
  2. Weld joints are visually inspected for conformance to specifications.
Defects are removed with minimum loss of sound metal using techniques and tools appropriate to the defect, material and process.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Weld joints are visually inspected for conformance to specifications.

Completed
Date:

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Maintain weld records as required

  1. Weld records are completed correctly.
Weld records are completed correctly.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

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 the GTAW 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 tungsten arc welding process (GTAW) 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 GTAW onto proformas and standard workplace forms

following oral instructions

measurement skills relating to joint preparation and GTAW

Required knowledge

Look for evidence that confirms knowledge of:

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

causes of defects and methods of rectification

the relationships between amperage, electrode and material

types of gases and their uses

types of electrodes, current settings, high frequency voltage

filler materials and consumables

safe welding practices

use and application of personal protective equipment for GTAW

Required Skills and Knowledge
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

Prepared

Preheating, setting up of jigs, fixtures, clamps, etc., joint preparation e.g. bevelling

Materials

Carbon steel or stainless steel, aluminium

Welding equipment

AC or DC welding machines

Distortion prevention measures

Preheating, setting up of jigs, fixtures, clamps, etc.

Rectified

Oxy acetylene and air arc equipment, grinding devices

Defects

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