I have a client who has a SMAW welding procedure based on ASME IX ,the base metal used for the WPS was( SA 53 B ,P1 Group 1 welded to P1 group 1) ,we have a vessel which needs repair which is constructed with SA 455 ,which is P1 group 2 ,questions ,based on ASME IX do we need to requalify our SMAW procedure I looked at QW403.50 which seems to say yes based on p number group number however QW424.1 seems to state any WPS qualified with a P number is qualified to weld any metal with the same P number ,without any mention of Grup Numbers
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