Could I use different welding processes in supporting PQR?

[Johnae]

My question is that the processes used in WPS are GMAW/SMAW and the processes used in supporting PQR are GMAW/FCAW. is this permitted? Should the welding processes in WPS and PQR be same?

 

[gtaw]

You have to state which welding standard is applicable.

AWS D1.1 Structural Welding Code/Steel has provisions for prequalified welding procedures using SMAW, FCAW, SAW, and GMAW (but not short circuiting transfer).

If (and that's a major IF), the PQR included GMAW short circuiting for the root and then FCAW for the fill passes, I don't see why a new WPS couldn't utilize GMAW-S for the root and SMAW for the fill since both the FCAW and the SMAW are prequalified processes.

That would not be the case for ASME Section IX.

Best regards - Al

 

[weldtek]

gtaw
If it is as you state, my question is why submit a suporting PQR?

 

[gtaw]

Once again, my answer is dependent on the applicable welding standard. The query didn't state what welding standard he is working to.

My reply is based on AWS D1.1, which may not be applicable. AWS D1.1 does not recognize GMAW using the short circuiting mode of transfer as prequalified. Therefore, a PQR demonstrating the ability to develop the mechanical properties required is necessary. Both the SMAW and FCAW processes are prequalified, thus no testing is necessary to use either SMAW or FCAW welding processes.

The original PQR utilized both GMAW and FCAW. I made the assumption that GMAW-S was used for the root and FCAW for the fill. That assumption may be wrong. Again, too little information was provided to know for sure.

SMAW can be substituted for the FCAW because both processes are considered prequalified. Again, the assumption is that all the other conditions of prequalification have been met. Whether or not all conditions of prequalification were met is a big question. Again, not enough information was provided to know for sure.

I do know that if ASME Section IX or API 1104 is the applicable welding standard, all bets are off!

I would be easier to provide a better answer if all the pertinent information was included in the original inquiry.


Best regards - Al

 

[henri2]

gtaw,

If D1.1 is the governing code, will the provisions of Section 3.6.1 help resolve the situation?

 

[gtaw]

Yes, if the applicable welding standard (code) is AWS D1.1. However, this same post was asked as an ASME question. That begs the question once again, what is the applicable welding standard?

Different welding standard - different answers


Best regards - Al

 

[GenB]

yeah ASME IX will requires qualification of the combination,
so single qualification is not alowed anymore.
genb