7.3 Plasma Arc Welding (PAW) 7.3.1 PAW, using the transferred arc mode, with filler wire addition may be used for welding all materials.
7.3.2 PAW, using the transferred arc mode, may be used for CRA weld overlay and metallic hard-facing, either by the addition of filler metal or powder spray.
7.3.3 Welding without the addition of filler metal (autogenous welding) shall be subject to Owner review and approval. Where this is proposed for 300 series stainless materials, Contractor shall ensure that suitable heats of steel are identified and welding procedures developed to avoid weld metal penetration problems associated with “cast-to-cast” variations.
7.3 Plasma Arc Welding (PAW) 7.3.1 PAW, using the transferred arc mode, with filler wire addition may be used for welding all materials. 7.3.2 PAW, using the transferred arc mode, may be used for CRA weld overlay and metallic hard-facing, either by the addition of filler metal or powder spray. 7.3.3 Welding without the addition of filler metal (autogenous welding) shall be subject to Owner review and approval. Where this is proposed for 300 series stainless materials, Contractor shall ensure that suitable heats of steel are identified and welding procedures developed to avoid weld metal penetration problems associated with “cast-to-cast” variations.
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