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Andy Stanfield
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Join Date: May 2012
Posts: 1

Special WPS/PQR For Welds That Require Post Weld Heat Treatment

05/10/2012 12:36 PM

Is a separate PQR required to weld when PWHT is required on the steel when fabricating a vessel to Sec VIII?
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Whitephone
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Join Date: Jan 2010
Location: Mineral wells Tx
Posts: 289
Good Answers: 10
#1

Re: Special WPS/PQR For Welds That Require Post Weld Heat Treatment

05/11/2012 2:23 AM

To determine this question, you sould add to what welding process we are talking about. WPS/PQR are referenced in ASME IX. Then:1.- Check what welding process you will use. (QW252 to QW265).2.-For your welding process wich are the "Essential Variables" (Any change in a essential variable, requiere a new WPS/PQR).

PWHT (QW 408) is essential variable for most of the welding process. The final answer is: YES, you need a separate WPS/PQR.

Regards. WP
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