Monday, November 25, 2013

Re: [MW:19362] Welding : Is PQR re-qualification is required for change in backing?

CAN BE USED. TYPE OF BACKING MATERIALS--BASE METAL, WELD MATERIAL OR ANY OTHER


On Mon, Nov 25, 2013 at 1:07 PM, <kishumayank@gmail.com> wrote:

I have one query, a manufacturer has a qualified PQR as per ASME section IX for 42mm thickness with SMAW+SAW process, in which SMAW is used as backing.

Now the manufacturer has welded joints with SAW process with copper backing strip for 42mm thickness.

Hence my question is, does manufacturer once again need to Re-qualify new PQR for SAW process with copper strip for welded joints, since backing is non-essential variable?? Such change in backing is allowed?

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