we have a PQR for duplex carried out on 6.5mm thick pipe this according to the PQR thickness range says qualified fro 1.5mm to 13mm , we have run some WPS's using this procedure on 13mm thickness pipe, on the WPS it states max thickness welder is qualified for Is 26mm 2xt, my question is which is correct? can the welder still weld up to 26mm thick pipe even though the PQR says a maximum of 13mm
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