Welding P1 and P8 materials-ASME IX

By DeanS Date 04-04-2006 14:22

We have an application where we are welding P1 to P1 material with A5.18, (F6) filler and in another situation P1 to P8 material with A5.9, (F6) filler. My understanding is that we need to produce a WPS and PQR for each application. Is this correct? Our welders are currently certified to weld P8 to P8 with A5.9, (F6) filler. Are they also qualified to weld these two WPS's per ASME IX (Ref. QW 423 and QW 433)?

By jon20013 (*****)

Date 04-04-2006 14:34

Dean; you will need to qualify a WPS for P1 to P8 but you're welders should be qualified without additional testing.

By DeanS Date 04-04-2006 14:48

Thank you jon20013! I am also assuming I need to qualify a WPS for P1 to P1 also and here again our welders should be qualified without additional testing.

By jon20013 (*****)

Date 04-04-2006 17:44

Dean; if you've qualified your welders to P8 (stainless steel) there is no need to requalify them to P1 under ASME IX Rules as long as none of their essential variables have changed. Have a look at QW-423.1. Simply put, under ASME IX, a welder qualified to weld P8 / P8 should be able to weld P8 / P1 or P1 / P1 without issue as long as the filler is F6.

Now then, having said that, there's a lot of things that COULD change from one procedure to the other which may or may not affect performance qualifications.

By pipewelder_1999 (****)

Date 04-04-2006 18:53

If you qualified your welders on the P8 to P8 using a backing gas, then they will be required to use backing for the P1 to P1 or requalify if backing gas is ommitted.

If you did the P8 to P8 w/o backing gas, everything should be fine.

If the most recent version of Sec IX has changed this, I apologize.

Hope this helps

Gerald Austin
http://www.weldinginspectionsvcs.com/

By jon20013 (*****)

Date 04-04-2006 19:16

Thanks Gerald. Yep, there are a myriad of things that could change... One reason I always test my guys on P1 / P1 (without backing) so I can use them for P8 / P8 with backing... besides, P1 tends to be a bit cheaper, at least as far as base metal goes... noting my ER70S-6 now costs more than my ER316L or ER309L... thank you China....