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.