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Stud Welds in ASME Section VIII-1 Pressure Vessel

Stud Welds in ASME Section VIII-1 Pressure Vessel

Stud Welds in ASME Section VIII-1 Pressure Vessel

Hello all,

I would like to seek your insights on the topic of welding non-pressure bearing attachments, which do not have a load carrying function, to pressure parts. Specifically, I am interested in understanding whether such welding should be exclusively performed by an ASME Certificate Holder.

The scenario I have in mind involves stud welding between a pressure vessel shell and a small stud that is not subjected to stress due to pressure. The welding process in question employs an automatic stud welding machine.

Based on my understanding of ASME VIII-1 UW-28(c)(2), it appears that procedure qualification testing is not required for this type of weld. However, I am uncertain whether the welding itself must be conducted by an ASME Certificate Holder.

I would greatly appreciate your input on this matter and kindly request that you provide references to the relevant Code paragraph, if possible.

Thank you in advance for your assistance.

RE: Stud Welds in ASME Section VIII-1 Pressure Vessel


Not sure if this helps but,
Even though a Procedure Qualification is not necessary per UW-28(c)(2), a WPS and subsequent WPQ's are mandatory in accordance with UW-29(b). As a matter of fact, the Welding Operators have to re-qualify at the beginning of each shift and certified records have to be kept.

RE: Stud Welds in ASME Section VIII-1 Pressure Vessel

Thank you very much

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