Unit of competency details

PMBWELD309 - Weld plastic using extrusion techniques (Release 1)


Usage recommendation:
Supersedes and is equivalent to PMBWELD309B - Weld plastic using extrusion techniquesSupersedes and is equivalent to PMBWELD309B Weld plastic using extrusion techniques 21/Jun/2016

Release Status:
ReleaseRelease date
1 1 (this release) 22/Jun/2016

Training packages that include this unit


SchemeCodeClassification value
ASCED Module/Unit of Competency Field of Education Identifier 030305 Materials Engineering  

Classification history

SchemeCodeClassification valueStart dateEnd date
ASCED Module/Unit of Competency Field of Education Identifier 030305 Materials Engineering  14/Oct/2016 
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Unit Of competency

Modification History

Release 1. Supersedes and is equivalent to PMBWELD309B Weld plastic using extrusion techniques


This unit of competency covers the skills and knowledge required to weld polyethylene (PE) and other plastic components using extrusion or injection welding techniques. It applies to welding undertaken in the field and in factory conditions.

This unit of competency applies to experienced operators who are required to confirm that materials and components are compatible for the weld, set up equipment, perform the welding, maintain and calibrate the equipment, assess joints against specifications and solve problems within area of responsibility.

This unit of competency applies to an experienced operator demonstrating theoretical and technical knowledge and well developed skills in situations that require some discretion and judgement. The operator may work alone or as a member of a team or group and will work in liaison with other shift team members, team leader and supervisor, as appropriate.

No licensing, legislative or certification requirements apply to this unit at the time of publication.

Pre-requisite Unit


Competency Field


Unit Sector

Not applicable

Elements and Performance Criteria

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.


Identify materials as being compatible for welding 


Identify materials as PE, polypropylene (PP), acrylonitrile butadiene styrene (ABS), high-impact polystyrene (HIPS) and polyvinylchloride (PVC) from specifications and work site instructions


Identify plastic materials and components supplied as being compatible for welding from specifications and tests


Identify appropriate plastics welding conditions 


Identify welding machine type and operating requirements


Identify plastic component materials and dimensions


Identify and select appropriate welding rods or granules


Select welding conditions for individual welding machines and plastic components


Prepare field operational sheets according to enterprise specification


Maintain, and calibrate welding equipment 


Set up welding equipment and work area according to enterprise specification


Ensure safety equipment available and operational according to enterprise procedures


Identify non-conformance, report and rectify according to enterprise procedures


Check operation, and calibrate where required, heating, material feed rate and pressure systems


Use personal protective equipment (PPE)


Perform welding to required standard 


Clean machine, align and trim abutting plastic component ends according to job specification


Assemble components in holding jigs


Perform heating, welding and cooling phases using selected welding conditions and specifications


Monitor and record achieved weld conditions for each assembly according to enterprise requirements


Clean up equipment when completed according to enterprise requirements


Clean up work site, dispose of scrap materials according to job specification


Assess quality of completed joints 


Identify quality requirements for joints according to specifications


Assess joints against specification requirements and report results according to enterprise requirements


Identify and report non-conformances according to job specification

Foundation Skills

This section describes those required skills (language, literacy and numeracy) that are essential to performance.

Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

Range of Conditions

This field allows for different work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included.

Regulatory framework  

The latest version of all legislation, regulations, industry codes of practice and Australian/international standards, or the version specified by the local regulatory authority, must be used.

Applicable legislation, regulations, standards and codes of practice include:

  • health, safety and environmental (HSE) legislation, regulations and codes of practice relevant to the workplace, manual handling and hazardous materials
  • Australian/international standards relevant to the materials being used and products being made
  • any relevant licence and certification requirements.

All operations to which this unit applies are subject to stringent HSE requirements, which may be imposed through state/territory or federal legislation, and these must not be compromised at any time. Where there is an apparent conflict between performance criteria and such requirements the legislative requirements take precedence.


All operations must be performed in accordance with relevant procedures.

Procedures are written, verbal, visual, computer-based or in some other form, and include one or any combination of:

  • emergency procedures
  • work instructions
  • standard operating procedures (SOPs)
  • safe work method statements (SWMS)
  • formulas/recipes
  • batch sheets
  • temporary instructions
  • any similar instructions provided for the smooth running of the plant.

Tools and equipment  

Tools and equipment include:

  • welding system/equipment, including one or more of:
  • electrical activated extrusion welding machine
  • electrical/pneumatic activated injection welding machine
  • measurement devices, including, timers, temperature probes and callipers
  • cleaning equipment
  • spray equipment
  • plastics machining equipment
  • assembly jigs and clamps.

Additional tools and equipment will be selected as required from:

  • hand tools used in this process
  • hoists/lifting equipment not requiring any special permits or licences
  • manual handling, aids such as hand carts and trolleys
  • relevant PPE.


Hazards must be identified and controlled. Identifying hazards requires consideration of:

  • hazardous products and materials
  • cutting equipment
  • sharp edges, swarf and scrap
  • protrusions or obstructions
  • slippery surfaces, spills or leaks
  • rotational equipment or vibration
  • smoke, dust, vapours or other atmospheric hazards
  • high temperatures
  • electricity
  • gas
  • gases and liquids under pressure
  • structural hazards
  • equipment failures
  • machinery, equipment and product mass
  • other hazards that might arise.


Routine and non-routine problems must be resolved.

Non-routine problems must be resolved by applying operational knowledge to develop new solutions, either individually or in collaboration with relevant experts, to:

  • determine problems needing action
  • determine possible fault causes
  • develop solutions to problems which do not have a known solution
  • follow through items initiated until final resolution has occurred
  • report problems outside area of responsibility to designated person.

Non-routine problems are unexpected problems or variations of previous problems and include one or more of:

  • variations in quality
  • emergency situations
  • intermittent faults.

Operational knowledge includes one or more of:

  • procedures
  • training
  • technical information, such as journals and engineering specifications
  • remembered experience
  • relevant knowledge obtained from appropriate people.

Routine problems are predictable and have known solutions and include one or more of:

  • 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.

Unit Mapping Information

Release 1. Supersedes and is equivalent to PMBWELD309B Weld plastic using extrusion techniques


Companion Volume implementation guides are found in VETNet - https://vetnet.education.gov.au/Pages/TrainingDocs.aspx?q=932aacef-7947-4c80-acc6-593719fe4090


Assessment requirements

Modification History

Release 1. Supersedes and is equivalent to PMBWELD309B Weld plastic using extrusion techniques

Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy the requirements of the elements and performance criteria and demonstrate the ability to:

  • read and interpret procedures, job specifications, national standards, material labels and safety data sheets (SDS)
  • distinguish between PE, PP, ABS, HIPS and PVC materials and welding rods/granules
  • select welding conditions appropriate to the welding equipment and components
  • set up welding equipment and materials/components to meet specifications
  • operate the extrusion or injection welding equipment to weld the materials/components
  • monitor key variables, including:
  • temperature
  • rate of extrusion/injection
  • pressure
  • product output rate
  • integrity of weld and general conformance to specification
  • assess quality of completed
  • make adjustments to remedy faults and non-conformity
  • identify hazards and apply relevant hazard controls
  • apply safety procedures
  • apply housekeeping procedures
  • apply waste management procedures
  • maintain and calibrate welding equipment
  • recognise early warning signs of equipment/processes needing attention or with potential problems
  • distinguish between causes of problems, including:
  • operational problems
  • materials properties
  • process variables
  • raw material/component variations
  • raw material contamination
  • procedural errors
  • recognise and prioritise problems requiring action
  • resolve routine and non-routine problems
  • communicate effectively with team/work group and supervisors
  • complete workplace records
  • do basic arithmetical manipulations, including additions, subtractions, divisions, fractions and percentages.

Knowledge Evidence

Must provide evidence that demonstrates knowledge relevant to their job sufficient to operate independently and to solve routine and non-routine problems, including knowledge of:

  • function and operating principles of welding system/equipment including one (1) or more of:
  • electrical activated extrusion welding machine
  • electrical/pneumatic activated injection welding machine
  • extrusion and injection welding processes and their effect on the welded product
  • impact of variations in welding process variables and raw materials on product quality and production output
  • factors which may affect product quality or production output and appropriate remedies
  • characteristics of materials and their behaviour in relation to welding process variables and stages of production
  • quality requirements
  • common adjustments in process variables and their impact on product quality and production output
  • routine and non-routine problems that may arise, the range of possible causes and appropriate actions
  • organisation procedures relevant to the work environment/job role
  • hierarchy of control
  • hazards that may arise in the job/work environment and:
  • their possible causes
  • potential consequences
  • appropriate risk controls.

Assessment Conditions

  • The unit should be assessed holistically and the judgement of competence shall be based on a holistic assessment of the evidence.
  • In all plants it may be appropriate to assess this unit concurrently with units such as:
  • teamwork
  • communication.
  • The collection of performance evidence:
  • should occur over a range of situations which include typical disruptions to normal, smooth operation of an operating plant
  • will typically include a supervisor/third-party report or other evidence, focussing on consistent performance and problem recognition and solving. A supervisor/third-party report must be prepared by someone who has a direct, relevant, current relationship with the person being assessed and who is in a position to form a judgement on workplace performance relevant to the unit of competency
  • must include the use of an appropriate industrial item of equipment requiring demonstration of operation, start and stop procedures and responding to problems
  • may use industry-based simulation for all or part of the unit particularly where safety, lack of opportunity or significant cost is an issue.
  • Assessment should occur in operational workplace situations. Where this is not possible or where personal safety or environmental damage are limiting factors assessment must occur in a sufficiently rigorous simulated environment that reflects realistic operational workplace conditions. This must cover all aspects of workplace performance, including environment, task skills, task management skills, contingency management skills and job role environment skills.
  • Assessment in a simulated environment should use evidence collected from demonstration of skills and one or more of:
  • walk-throughs
  • pilot plant operation
  • industry-based case studies/scenarios
  • ‘what ifs’.
  • Knowledge evidence may be collected concurrently with performance evidence or through an independent process, such as workbooks, written assessments or interviews.
  • 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.
  • Conditions for assessment must include access to all tools, equipment, materials and documentation required, including relevant workplace procedures, product and manufacturing specifications associated with this unit.
  • The regulatory framework will be reflected in workplace policies and procedures and is not required to be independently assessed.
  • Foundation skills are integral to competent performance of the unit and should not be assessed separately.
  • Assessors must satisfy the assessor competency requirements that are in place at the time of the assessment as set by the VET regulator.
  • In addition the assessor or anyone acting in subject matter expert role in assessment shall demonstrate both technical competency and currency. If the assessor cannot demonstrate technical competency and currency they shall assess with a subject matter expert who does meet these requirements.
  • Technical competence can be demonstrated through one or more of:
  • relevant VET or other qualification/Statement of Attainment
  • appropriate workplace experience undertaking the type of work being assessed under routine and non-routine conditions
  • appropriate workplace experience supervising/evaluating the type of work being assessed under routine and non-routine conditions
  • Currency can be demonstrated through one or more of:
  • being currently employed undertaking the type of work being assessed
  • being employed by the organisation undertaking the type of work being assessed and having maintained currency in accordance with that organisation’s policies and procedures
  • having consulted/had contact with an organisation undertaking the type of work being assessed within the last twelve months, the consultation/contact being related to assessment
  • conducting on the job training/assessments of the type of work being assessed
  • being an active member of a relevant professional body and participating in activities relevant to the assessment of this type of work.


Companion Volume implementation guides are found in VETNet - https://vetnet.education.gov.au/Pages/TrainingDocs.aspx?q=932aacef-7947-4c80-acc6-593719fe4090