Mixing of welding processes/electrodes
Mixing of welding processes/electrodes
(OP)
I am a CWI working under AWS D1.1 almost %100 of the time and I have a question. Is there anywhere in the code that directly prohibits the use of both SMAW E7018 and FCAW E71T-8 electrodes to compile the same weld? A contractor is proposing to tack weld with E7018 and complete final welding with E71T-8. I think the obvious solution from an inspector's stand point would be, "please show me your WPS for this," since table 4.5 item# 4 under filler metal says that a WPS written for classification A5.1 would not be applicable to a weld performed under classification A5.20 and vice-versa. However, I am asking from more of a structural and metallurgical standpoint as it might be possible to perform a WPS qualification using the two processes. Any help would be appreciated...





RE: Mixing of welding processes/electrodes
Both FCAW and SMAW are prequalified processes. The contractor can write a WPS that uses the processes in any combinatin provided all the other provisions of prequalification are met.
Best regards - Al
RE: Mixing of welding processes/electrodes
RE: Mixing of welding processes/electrodes
E7018 is a safe bet for nearly any application provided it is a matching filler metal for the steel being welded.
There are times when the flux of the FCAW weld will be dificult to completely remove when the FCAW passes over the tack. Other than that, no problem I am aware of.
Best regards - Al
RE: Mixing of welding processes/electrodes
If I recall this is in the fabrication section of D1.1, Chapter 5. 5.18 or somewhere close. Sorry I am answering on my cellphone.
http://www.FerrellEngineering.com
RE: Mixing of welding processes/electrodes
Hg
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