×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Could I use different welding processes in supporting PQR?

Could I use different welding processes in supporting PQR?

Could I use different welding processes in supporting PQR?

(OP)
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?

RE: Could I use different welding processes in supporting PQR?

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

RE: Could I use different welding processes in supporting PQR?

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

RE: Could I use different welding processes in supporting PQR?

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

RE: Could I use different welding processes in supporting PQR?

gtaw,

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

RE: Could I use different welding processes in supporting PQR?

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

RE: Could I use different welding processes in supporting PQR?

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

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close