Assessor Resource

MEM05019C
Weld using gas tungsten arc welding process

Assessment tool

Version 1.0
Issue Date: May 2024


Welds are associated with heavy or light fabrication. Fillet and butt welds in all positions would typically be performed on a range of materials that may include carbon steel or stainless steel, aluminium. The weld quality would meet the Australian Standard 1554 General Purpose or equivalent.

This unit covers preparing materials, selecting and setting up the welding equipment, carrying out the gas tungsten arc welding (GTAW) and inspecting for and correcting defects.

You may want to include more information here about the target group and the purpose of the assessments (eg formative, summative, recognition)

Prerequisites

Path 1

MEM05049B Perform routine gas tungsten 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



Evidence Required

List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.

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

Submission Requirements

List each assessment task's title, type (eg project, observation/demonstration, essay, assingnment, checklist) and due date here

Assessment task 1: [title]      Due date:

(add new lines for each of the assessment tasks)

Assessment Tasks

Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.

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

Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.

Observation Checklist

Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice Yes No Comments/feedback
Weld requirements are identified from specifications and/or drawings. 
Material is correctly prepared. 
Materials are assembled/aligned to specification, where required. 
Welding machine settings, accessories and consumables are identified. 
Welding equipment is assembled and set up. 
Appropriate distortion prevention measures are selected for weld and material type. 
Distortion is rectified. 
Weld deposit is to specifications. 
Joints are cleaned to specifications. 
Defects are removed with minimum loss of sound metal using techniques and tools appropriate to the defect, material and process. 
Weld joints are visually inspected for conformance to specifications. 
Weld records are completed correctly. 

Forms

Assessment Cover Sheet

MEM05019C - Weld using gas tungsten arc welding process
Assessment task 1: [title]

Student name:

Student ID:

I declare that the assessment tasks submitted for this unit are my own work.

Student signature:

Result: Competent Not yet competent

Feedback to student

 

 

 

 

 

 

 

 

Assessor name:

Signature:

Date:

Assessment Record Sheet

MEM05019C - Weld using gas tungsten arc welding process

Student name:

Student ID:

Assessment task 1: [title] Result: Competent Not yet competent

(add lines for each task)

Feedback to student:

 

 

 

 

 

 

 

 

Overall assessment result: Competent Not yet competent

Assessor name:

Signature:

Date:

Student signature:

Date: