As per ASME Sec IX, EPC Contractor qualified WPS/PQR for carbon steel material.Based on contractor qualified PQR,whether subcontractor can prepare WPS and use for welding. EPC contractor will take operational control and responsibility of welding activities.
code of construction is ASME B31.3.
Please throw some light on QW 200.
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Nothing is difficult, you just didn´t understand it yet...
With Warm regards,
G.Padmanabhan
G.Padmanabhan
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