American Welding Society Forum
We are planning to conduct Procedure qualification for welding tube-to-tubesheet partial penetration strength weld of HEX. ASME IX QW-193 is not specified per original code. So, we have chosen to go for qualification by Groove Weld as per ASME IX QW-202.6(a).
The tube thickness is 2.11mm. The thickness of tubesheet is 60mm. Higher thicknesses of tubesheet are also required to be qualified.
The question is: if we want to qualify a WPS utilizing two PQRs, what is the thickness of test coupons to cover the thinner and thicker members and what would be the joint design (tapered or not). In addition, how about the PWHT requirement for the thin plate and thick plate. Of course, at site we like to avoid PWHT, if possible.
Did you check the applicable construction code to see if they modified Section IX with regards to qualifying the WPS for tube to tube sheets welds?
It is designed to ASME VIII, which does not require mock-ups for tube-to-tubesheet weld qualification.
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