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Elements and Performance Criteria

1. Prepare for cutting and welding underwater
   • Identify and analyse work task, worksite data and work object to determine task requirements
   • Develop work plan consistent with dive plan in accordance with organisational procedures and task requirements
   • Select, inspect and prepare thermal cutting and welding tools, electrical generator and associate leads, and oxy acetylene gas cylinders and associated hoses, in accordance with manufacturer specifications
   • Secure equipment for transport to/from dive site
   • Identify obstructions and other cutting/welding hazards to determine risk and to manage risk control measures in accordance with dive plan
2. Operate thermal cutting and welding tools underwater
   • Secure thermal cutting and welding tools on self during dive
   • Determine safe routes for leads and hoses to worksite in accordance with dive plan and operational safety procedures
   • Determine safe work area and confirm location of other divers prior to commencing cutting/welding work tasks, in accordance with work plan
   • Manage cutting and welding tool hazards in accordance with dive plan and operational safety procedures
   • Disconnect and render tools safe in accordance with dive plan and operational safety procedures
3. Operate generator
   • Conduct routine operational and pre-start checks and diagnose and address warning signs in accordance with manufacturer specifications
   • Shut down and/or conduct emergency shut down drills in accordance with dive plan
4. Complete underwater cutting and welding operations
   • Minimise environmental impact arising from use of thermal cutting and welding tools, and recover waste products
   • De-service and store equipment on task completion in accordance with organisational procedures

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment. Non-essential conditions may be found in the Companion Volume Implementation Guide.

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria on at least two separate occasions and include: applying relevant legislation, standards, and organisational policies and procedures completing underwater cutting and welding operations safely cutting 12 mm steel plates identifying and addressing relevant cutting/welding workplace hazards and problems operating generator to support welding tasks in an underwater environment operating thermal cutting and welding tools underwater planning for cutting and welding underwater stabilising a generator undertaking underwater welding activities including: preparing surface of work object for cut or weld controlling voltage and amperage of arc welding equipment turning on gas supplies adjusting ratios of oxygen and acetylene controlling pressure of oxy acetylene torch making cuts and welds ensuring minimal distortion to object inspecting and cleaning cuts and welds developing power gradually without surging using a number of thermal cutting and welding tools (non-load bearing) in an underwater environment work tasks: at depths between 5 metres and 20 metres on at least one night work task welding manual metal arc using electric welding equipment.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements and performance criteria and include knowledge of: dive equipment dive physics dive physiology and medicine including: heat and cold illnesses compression illnesses decompression illnesses diving descent and ascent techniques general diving safety awareness including: diving in harbours diving in tidal waters, currents and tides diving on and/or near a ship’s bottom lost/separated entrapment/foul lines marine animal threats pollution/weeds working in confined spaces oceanography relevant cutting/welding workplace hazards and problems relevant legislation, standards, and organisational policies and procedures thermal cutting and welding principles and techniques.

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