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Fw: [MW:31265] Combination of PQRs

By Materials & Welding
Hello ALL,
I agree with the recomended filler suggested in  e-mail below. ER385 is recomended in this application & a proven filler alloy. 
Service condition will govern the Corroision properties.of weld deposit. 

A PDS is attached for review . There are other reputed manufacturer as well.
Thanks 
Amitabh 



----- Forwarded Message -----
From: Customer Care <bricenori@hotmail.com>
To: materials-welding@googlegroups.com <materials-welding@googlegroups.com>
Sent: Sunday, August 2, 2020, 11:58:32 PM EDT
Subject: RE: [MW:31261] Combination of PQRs

Good morning Gigi, 

Well, I will try to be explicit as much as possible.

Welding a type 904L steel (high-alloy austenitic stainless steel) with filler type ERNiFeCr-1, has the following consequences:

-Both materials solidify in the austenite phase, with exponential increase in hot thermal expansion, which makes the weld susceptible to hot cracking in the HAZ.
-An indicator of this behavior, we can see it in a Schaeffler diagram, where if the filler metal ERNiFeCr-1 is used, the nickel equivalent (austenite phase former) rises considerably. There is no delta ferrite, a phase that helps prevent the weld from cracking during solidification.
- On the other hand, if ERNiFeCr-1 is used for the 904L, the Mo content in the weld is weakened and with it, reduces the resistance to pitting in chloride environments and the risk of cracking in sulfuric acid environments.

For this reason, whenever possible, we must use filler materials that are most compatible with the base metal, both in chemical composition and in the formation of the most similar solidification structures.
To solve this 904L welding problem, filler material ER385 was created. They remain as brothers at the end of everything.

I hope my comments serve you,

Regards,

Ramon Briceno / Metallurgical Engineer - Oil & Gas

www.linkedin.com/in/ramon-briceño-976265b5

 





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