PQR thickness and PWHT
PQR thickness and PWHT
(OP)
A fabricator submitted WPS/PQR for review. The thickness of the Carbon Steel(ASTM A516-60N) test coupon on PQR is 40mm. The preheat temperature is 10C. No PWHT for the test coupon.
Based ASME VIII DIV.1, PWHT is mandatory for Carbon Steel plate thickness over 38mm. Is it a qualified PQR? Can it be used to support the WPS (PWHT not required)?
Please advice. Appreciated.
Based ASME VIII DIV.1, PWHT is mandatory for Carbon Steel plate thickness over 38mm. Is it a qualified PQR? Can it be used to support the WPS (PWHT not required)?
Please advice. Appreciated.





RE: PQR thickness and PWHT
Not enough information. You need to review the entire PQR and submitted WPS to answer this question. Please review ASME Section IX.
It depends, if this is a qualified PQR from above.
You make no mention of Section IX. Do you even have a copy of Section IX to review the entire WPS and PQR? This is the only way to understand this.
Advice;
If you are reviewing weld procedures and have no understanding of how procedures are qualified and how to review them in accordance with ASME Section IX, get some professional help from a welding consultant or take some ASME/National Board courses.
RE: PQR thickness and PWHT
Thanks for your comments.
Suppose the other parameters in the PQR and WPS comply with ASME IX, except for the information I mentioned above. I do not know whether I can use this PQR or not.
RE: PQR thickness and PWHT
RE: PQR thickness and PWHT
Be sure though, that the WPS is not written to cover weld thicknesses, that, by Code, require PWHT.
RE: PQR thickness and PWHT
Could you explain your comments? I did not catch what your point. Thank you very much.
RE: PQR thickness and PWHT
Being qualified to weld plates up to 200 mm in thickness without PWHT, may still be necessary, as in the case of joints of dissimilar thickness. The WPS has two areas that cover max thickness, one is for base metal, the other is actual weld thickness. They have to be treated and considered separately.