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Elements and Performance Criteria

  1. Identify materials as being compatible for welding.
  2. Identify appropriate plastics welding conditions.
  3. Maintain, and calibrate welding equipment.
  4. Perform welding to required standard.
  5. Assess quality of completed joints.

Required Skills

This describes the essential skills and knowledge and their level required for this unit

Knowledge and understanding of PE PP ABS HIPS and PVC materials and welding rodsgranules as described in national standards to recognise welding compatibility and suitability

Knowledge of detailed work instructions necessary to perform extrusion and injection welding and the ability to implement these within required parameters to attain required quality outcomes

Knowledge as a basis for solving processing and material problems including

identify substrate and welding materials being used

identify welding conditions for individual machine types and component materials

maintain and adjust operating conditions in welding machines

set up and maintain safe working environment

operate welding machines within required conditions

assess quality of completed welded joints

identify and rectify fault causes arising from machine operation and component variability

establish and maintain quality records

Language literacy and numeracy requirements

Read material which is sequenced for instructions explanations information or opinions

Write short and simple messages about routine tasks or activities or complete forms

Use handson reallife materials and picturesdiagrams based on personal experience and prior knowledge

Use several pieces of related mathematical information

Read write and speak whole numbers and money sums recognise and interpret simple fractions decimals and percentages use simple data grid references

Use simple grammatical forms and vocabulary to give instructions give explanations ask questions and express viewpoints

Clarify intended meaning by asking for repetition when listening and varying speed and changing tone or emphasis when speaking

Use strategies such as providing verbal and nonverbal feedback in order to show interest or attitude

Evidence Required

The Evidence Guide provides advice on assessment and must be read in conjunction with the performance criteria required skills and knowledge the range statement and the assessment guidelines for this training package

Overview of assessment

A holistic approach should be taken to the assessment

Assessors must be satisfied that the person can consistently perform the unit as a whole as defined by the Elements Performance Criteria and skills and knowledge

Critical aspects for assessment and evidence required to demonstrate competency in this unit

It is essential that the weld quality meets the requirements of the standard This may require testing of the weld in accordance with the standard

Consistent achievement of required quality standards is critical

Assessment method and context

Assessment will occur using industrial plastic pipeplatesheet and welding equipment and will be undertaken in a worklike environment

Competence in this unit may be assessed

using appropriate industrial equipment situations and polymers

in a situation allowing for the generation of evidence of the ability to recognise anticipate and respond to problems

by using a suitable simulation andor a range of case studiesscenarios

through a combination of these techniques

In all cases it is expected that practical assessment will be combined with targeted questioning to assess the underpinning knowledge and theoretical assessment will be combined with appropriate practicalsimulation or similar assessment Assessors need to be aware of any cultural issues that may affect responses to questions

Assessment processes and techniques must be culturally appropriate and appropriate to the oracy language and literacy capacity of the assessee and the work being performed

Specific resources for assessment

This section should be read in conjunction with the Range Statement for this unit of competency Resources required include suitable access to an operating plant or equipment that allows for appropriate and realistic simulation A bank of case studiesscenarios and questions will also be required to the extent that they form part of the assessment method Questioning may take place either in the workplace or in an adjacent quiet facility such as an office or lunchroom No other special resources are required

Access must be provided to appropriate learning andor assessment support when required Where applicable physical resources should include equipment modified for people with disabilities

Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Add any essential operating conditions that may be present with training and assessment depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts.

Where reference is made to industry codes of practice and/or Australian/international standards, the latest version must be used.

Context

This competency unit includes the extrusion and injection welding of PE, PP and other plastic components using electrical (or other) activated welding equipment.

It also includes the operation of all relevant ancillary equipment to assemble components prior to welding.

Specifications include Australian Standards, workplace specifications and instructions, and government codes and regulations.

Procedures

All operations are performed in accordance with procedures.

Procedures include all relevant workplace procedures, work instructions, temporary instructions and relevant industry and government codes and standards.

Tools and equipment

This competency includes use of equipment and tools such as:

electrical activated extrusion welding machines

electrical/pneumatic activated injection welding machines

measurement devices, including, timers, temperature probes and callipers

cleaning fluids and wipes (eg isopropanol)

plastics machining equipment

assembly jigs and clamps

relevant safety equipment

comprehensive work instructions.

Hazards

Typical hazards include:

hazardous cleaning fluids

plastic sheet material handling

heavy stationary and moving machinery

cutting and heating components.

Problems

'Anticipate and solve problems' means resolve a wide range of routine and non-routine problems, using product and process knowledge to develop solutions to problems which do not have a known solution/a solution recorded in the procedures.

Typical process and product problems may include:

incompatible materials (pipes/rods)

variable plastics sheet material grades and supplied welding rods/granules

equipment malfunction or wear and tear

variable factory and field site conditions.