Dear Js55,
So when we a going to combine two PQR, we concern about thickness of the test coupon, if the thickness of the test coupon > 13 mm then we can combine it? But in QW-200.4(b) I see "For GTAW, SMAW, GMAW, PAW, and SAW, or combinations of these processes, a PQR ----for a process---- recording a test coupon that was at least 1/2 in. (13 mm)..." as you see, it mention "for a process" it mean that for each process. As above when PQR1 = GTAW (3 mm) + SMAW (10 mm) then GTAW is inadequate thickness to combine with other PQR, is it correct?