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Flux clasification change

Flux clasification change

(OP)
Good morning estimates colleagues, i have a question about a change of flux and how affect the WPS.


We are currently working with SAW process, welding bottom plates of a storage tank, an 8 mm thick plates, S-275 J2, our current WPS was designed for work with a BS EN ISO 14174 SA AB 1 67 AC H5 FLUX, and a wire AWS A5.17 EM12K.



Our construction manager propose to work with the same wire, but a different trade flux, a AWS A5.17 F7A2.


How would affect this new mixture of wire/flux the weld metal?

This requires some new WPS?

This change has relation with QW 404.9, so we have to made a new PQR?

Or doesn't affect the change of the commercial name?

ThankĀ“s for your attention in this matter

RE: Flux clasification change

II23,
You say your WPS was designed for work with an ISO steel and BS EN ISO filler metals but then you start quoting ASME requirements.
What code is your WPS/PQR qualified to ?
Cheers,
DD

RE: Flux clasification change

(OP)
Thanks, our WPS was qualified by ASME Section IX, truly it's a bit confusing, but it was the approved for our client

RE: Flux clasification change

2
II23,
This is all I can find

Interpretation: IX-83-169
lX-83-169, IX-83-170, IX-83-171
Subject: Section IX, QW-404.9
Date Issued: May 14, 1985
File: BC85-089
Question: For submerged-arc welding, can a fabricator use a different brand of flux than that
specified in a wire-flux classification for which he is qualified, without performing a new PQR?
Reply: No.

Regards,
DD

RE: Flux clasification change

(OP)
Thanks a lot DekDee, this clarified my doubts.

I was confused by paragraph QW 404.29 "A change in the flux trade name and designation."

In the QW 254, WELDING VARIABLES PROCEDURE SPECIFICATIONS (WPS)Submerged-Arc Welding (SAW) says that a change in a trade name it's a nonessential variable. However the final point is that we specified the commercial name and specification of the flux in the PQR, and that's the final word.

RE: Flux clasification change

The flux specification plays a direct role in determining mechanical properties of the SA weld metal.

RE: Flux clasification change

There are many Owners and Engineers who, in their specifications, make flux trade designations an essential variable. So be sure to fully read the contract specifications.

RE: Flux clasification change

(OP)
Thanks a lot for your opinions and comments, we decided to make a new PQR and WPS for this change, since the type of flux that we are using it's the active type, it's not recommendable for multiple weld passes, so we are going to limit this procedure to single pass fillet welds

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