Dissimilar Metal T PQR question
Dissimilar Metal T PQR question
(OP)
I would like to weld a P1(2.125”) – P8(1.5”) full pen groove coupon with dissimilar base metal thicknesses for a PQR. My test lab is not sure how to handle this. I cannot seem to find direction per ASME IX. I expect that the lab has to grind/machine the thicker material to the thinner T.
Any insight would be appreciated.
Any insight would be appreciated.





RE: Dissimilar Metal T PQR question
RE: Dissimilar Metal T PQR question
Best regards - Al
RE: Dissimilar Metal T PQR question
RE: Dissimilar Metal T PQR question
Why? We have some P1G2 material that is 2.125" in house. A lot cheaper and quicker to use that material than to order mat'l special for this qual.
Thank you,
EG
RE: Dissimilar Metal T PQR question
The Code provides general guidance for coupon geometry, mechanical testing and thickness requirements for weld procedure qualification ranges. As you stated, you can machine the coupon thickness prior to testing to match thickness, it makes no difference.
RE: Dissimilar Metal T PQR question
The lab has specific criteria which will be based on the thinner of the 2 members. AWS and ASME mention the slopes for finished welds. The coupons have a given thickness of 1 1/2".
My 2 cents worth.
RE: Dissimilar Metal T PQR question