Welding wire change

Date 06-17-2007 17:20

Off the top of my head I doubt it. Without other considerations, the strengths of those two don't match. Your going from higher to lower. If it's a cvn application, then you've changed classification which is a requal. and again on table 4.9, it's a change. I'd say no.

By MBSims

Date 06-17-2007 23:30

The way PQR essential variable #3 in Table 4.5 reads, I would say that this change requires requalifying the WPS:

"Change from one electrode or flux-electrode
classification to any other electrode or
flux-electrode classification."

Footnote "a" says "The filler metal strength may be decreased without WPS requalification." But, this is more than a decrease in filler metal strength, since this is also a change in chemistry from a nickel-containing weld metal to a plain carbon steel electrode.

By Kix

Date 06-19-2007 14:35

Mbsims hit the nail right on the head for that one so i'd say yeah it has to be requalified also. Thats three people so hope this helps!!

By adrian adams Date 06-19-2007 16:48

Thanks Guys
It was the Foot note that was giving me cocern

By Bill M

Date 06-20-2007 17:40

I have a question---So the reason he has to requalify is that the "Change from one electrode or flux-electrode classification to any other electrode or flux-electrode classification."?

What if the E71T FCAW electrode he selected also complied with AWS A5.29 (the classification of the original qualified E81T1-Ni1 electrode)? Then he did not change from one classification to another classification. Does he have to re-qualify now?

By pax23

Date 06-20-2007 21:23

A5.20 and A5.29 are specifications or standards; they are not classifications.

E71T and E81T1-Ni1 are classifications and therefore switching from one to the other requires requalification according to Table 4.5 EV#3.

By Bill M

Date 06-21-2007 14:51

I gotcha now..Thanks for clearing it up Pax!