Classifying ER70S-6 as A-No. 1

[DVWE]

Most filler metal manufacturers class ER70S-6 as F-No. 6, A-No. 1. However, both Mn and Si as listed in SFA-5.18 can exceed the limits of QW-442.

So my question is, in order to classify this wire as A-No. 1, do I need a certified MTR from the manufacturer for every lot of wire which we use in production? If this is the case, I am assuming that a weld pad made per the requirements of the SFA must be followed using the same shielding gas?

\Thanks in advance/

 

[metengr]

So my question is, in order to classify this wire as A-No. 1, do I need a certified MTR from the manufacturer for every lot of wire which we use in production?

Yes. However, why do you need to worry about classifying this filler metal as an A-No 1? You can qualify the welding procedure using the AWS filler metal classification, as an option.

 

[deanc]

metengr is right....

This has been an ongoing problem for years. Read entire paragraph of Sec IX QW-404.5.

Talk to your AIA about same.

 

[DVWE]

Thank you gentlemen, I figured this is not the first time this issue has surfaced.

The thing is, is that I already have a WPS qualified for F-No. 6, A-No. 1 and I also read a ton of our customers' specs that state something to the extent of "only A-No. 1 filler metals shall be used in production."

I don't know if these are older specs that have just never been revised or if the customer doesn't realize that this inadvertently removes ER70S-6 (technically). The other issue is that our wire manufacturer classifies it as A-No. 1, and in the past we have never asked for a CMTR. I will simply start doing asking for them per lot, that oughta make 'em happy!