Dissimilar base metal welder qualifications as per ASME sec IX
Dissimilar base metal welder qualifications as per ASME sec IX
(OP)
Hello,
As Per QW 423.1 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, including unassigned metals of similar chemical composition to these metals.
Does it mean any combination like, if base metal in welder qualification is P1-P1 GTAW+SMAW with or without backing with F.no 6 & 5 then he is qualified to weld P1-P8 GTAW+SMAW with or without backing with F.no 6 & 5 ?
As Per QW 423.1 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, including unassigned metals of similar chemical composition to these metals.
Does it mean any combination like, if base metal in welder qualification is P1-P1 GTAW+SMAW with or without backing with F.no 6 & 5 then he is qualified to weld P1-P8 GTAW+SMAW with or without backing with F.no 6 & 5 ?





RE: Dissimilar base metal welder qualifications as per ASME sec IX
RE: Dissimilar base metal welder qualifications as per ASME sec IX
If you qualified with backing gas you cannot weld in production without backing gas (eg. P1 would need to be purged)
If you welded P1 with F6 & 4 (C/S) without purge then as David stated you would put "optional" for gas backing so you can add it for stainless if required.
However, if you welded P1 with F6 & 5 (S/S) with gas backing then you would need to put "required" for gas backing.
Regards,
Shane
RE: Dissimilar base metal welder qualifications as per ASME sec IX
RE: Dissimilar base metal welder qualifications as per ASME sec IX
Without the OP's response we will never know.
However, it seems a bit strange.
SMAW/FCAW, SMAW/GMAW, GMAW/FCAW - you could understand the use of backing material but why would you use backing material with a GTAW root run ?
Cheers,
Shane
RE: Dissimilar base metal welder qualifications as per ASME sec IX
RE: Dissimilar base metal welder qualifications as per ASME sec IX
P1-P1 GTAW+SMAW with or without backing with F.no 6 & 5 (i.e. test coupon P1-P1 was welded without backing gas for root during welder qualification test so welder is qualified for with or without backing gas). so can this qualification be used for P1-P8 with backing gas ( F no's remain same )?
RE: Dissimilar base metal welder qualifications as per ASME sec IX
However, just curious.
Was the GTAW filler material stainless steel or carbon steel ?
If stainless steel was used was there no backing gas on the welder qualification ?
RE: Dissimilar base metal welder qualifications as per ASME sec IX
GTAW filler material was carbon steel (ER 70 S-2 ). But for production weld we have to use P1-P8 with ER309L+E309L with backing gas.
Thanks,
RE: Dissimilar base metal welder qualifications as per ASME sec IX
Is that correct ?