Thanks. just one more question I have welder qualified for SMAW/SAW (P43 TO P8) welding procedure, Would he able to weld overlay for SAW (P43 -P8) Welding procedure?
I no longer have access to the current editions of ASME IX. So I am only going with my memory that ASME IX required separate qualification for corrosion resistant weld overlay.
I agree with that, david. As long as there is no chemical composition specified in the WPS. Personally, I can't recall writing or reviewing CRO WPSs that didn't have a chemical composition specified; they have always had one listed.
The devil is in the details; she also wears prada.
Can I please ask for further discussions/clarifications on this subject ?
I am a stickler for following whatever is the relevant code but I am struggling to understand this one.
Welder qualification is all about the welder / welding operators ability to lay a sound weld - nothing to do with the chemical composition.
If the welding operator has qualified previously on P8-P43 with SAW what is the difference between him/her running capping runs on a groove weld or running CRO beads on the same joint configuration ?
If the F-number for the original qual covers the F-number for the CRO I fail to see the problem.
Can David or DVWE please explain why chemical composition on the WPS (or lack of) influences the welder qualification.
Not being a smartass - trying to learn.
Cheers,
Shane
I wish I had a good answer for you on that, but I can't speak for the code. I should say that I also agree with your sentiments.
I can only go back to my earlier statement of not ever reviewing or writing a WPS without a listed chemical composition. I don't know where the connection is between that and a welder's ability to deposit a sound weld. Maybe there is an interpretation out there somewhere.
But, it goes without saying that the purpose of testing for chemistries on a CRO WPS is to ensure proper chemical ranges are achieved. Perhaps somebody with deep enough pockets convinced the committee that this is not always needed or required.
Either way, the deposited "t" must be listed on the WPS - it is an essential variable. Deposited "t" is determined using QW-462.5(a). The only way to do it properly is to do a macro etch. If someone with enough confidence or experience knows that proper chemical ranges are achieved with a certain thickness of "t", without performing a chemical analysis, maybe they can accept that. Therefore they could accept a groove weld qualification for a CRO qualification.
The devil is in the details; she also wears prada.
Agree with DVWE, we always provided chemical analysis even when the Client did not require one. Other wise we could not use it for other projects which required a minimum chemistry. Welder qualification does not require chem analysis under Code.
