Dear Experts,
I need some confirmation / explain from your part.
I have welders qualified for GTAW process in carbon steel coupon test material, according my understanding for ASME sect IX welders performance qualification, welders is qualified to weld Stainless steel under all essential variable requirement are ok. IT's our case (Same FN°6 filler metal, added backing gas....).
But our client, said that, according ASME sect IX QW-423.1, welders can not be qualified to weld Stainless steel (PN°8) , it's mention that "When a base metal shown in the left column is used for welder qualification, the welder is qualified to weld all combinations of base metals shown in the right column" means as their explain, Welder qualified with carbon steel coupon can weld CS to one of (PN°1 to PN°11) but not PN°X to PN°X, X from 1 to 11.
Can you confirm if i'm right and how to get confirmation from ASME sect IX, means what's the means of "combination" in ASME sect IX QW-423.1).
Regards
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Zakaria
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