PQR thickness and PWHT

[engineermat]

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.

 

[metengr]

engineermat;

Is it a qualified PQR?

Not enough information. You need to review the entire PQR and submitted WPS to answer this question. Please review ASME Section IX.

Can it be used to support the WPS (PWHT not required)?

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.

 

[engineermat]

engineermat,

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.

 

[metengr]

Yes, this PQR can support a WPS with no PWHT.

 

[weldtek]

engineermat,
Be sure though, that the WPS is not written to cover weld thicknesses, that, by Code, require PWHT.

 

[engineermat]

weldtek,

Could you explain your comments? I did not catch what your point. Thank you very much.

 

[weldtek]

If I have a PQR that was run on 40 mm thick plate, which was not PWHT'd, per QW451, it will support WPS' for welding material thicknesses thru 200 mm, but, it will only support weld thicknesses which do not require PWHT. So if the Code of construction is ASME Sec VIII, I can weld plates that are 200 mm thick, but, the maximum weld thickness is limited by UCS 56.
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.