PWHT will relieve residual stress and can open up flaws which are otherwise closed by the residual stresses, and that is the reason why NDT for acceptance purposes is performed after PWHT.
Alan Denney
AKD Materials Consulting Ltd
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ajay
Sent: 29 September 2015 05:03
To: materials-welding@googlegroups.com
Subject: [MW:23575] Regarding RT before or after PWHT
Dear Sir,
As we all aware that PWHT and RT both are different in nature, in general we perform RT after PWHT(Where PWHT is required to be perform after welding).
However it is not written anywhere that RT is to be performed after PWHT only.
My question now is , can we perform RT first and then go for PWHT? will it be acceptable ????.
I have seen many client inspectors asked contractors to perform PWHT first then RT whereas their specifications does not say anything in this regard.
All experts are requested to throw light on the subject. Documented proof/literature , if any, to support this will be higly appreciable.
regards,
Ajay
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