Welding UNS80904 (904L) to Alloy C276 3

[Heating88]

Good morning folks,

I was wondering if there was any key advice that could be provided for the selection of consumables for welding 904L to C276. I am conscious that C276 is the much higher alloy of the two in terms of Nickel content. I am also aware that there is a great difference in the thermal expansion coefficients of the two alloys - and the effect that could have if the weld were subject to thermal cycling.

Does anyone have any experience of satisfactory performance using the higher alloy consumable or do experienced welding engineers seek to use something of a compromise for the consumable i.e 625 etc.
Many thanks in advance for any assistance that you good folk can provide.

 

625 filler metal would do, also matching filler metals from any of the Hastelloy C group - C276, C22.

Since you are stuck with a nickel-based filler metal, there's not much you can do with alloy selection to affect any thermal expansion risk you may have, but I have to ask, how real is that risk? Just because there is a difference in CTE doesn't mean there will necessarily be a problem.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[EdStainless]

I would use C22 filler, just because I use it for a lot of high alloy work.
I wouldn't be too concerned with CTE, these are both very ductile materials.

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P.E. Metallurgy, consulting work welcomed

 

EdS,

C22 is also my recommendation for a number of nickel alloy combinations.

C22 is also now preferred for joining superaustenitics. Mo segregation in I-625 deposits is high, leaving it vulnerable in severe chloride-containing environments. I've seen it happen myself.

A word to the wise: keep both heat input and interpass temperature low. The more I have learned about Ni welding the more restrictive this advice has become.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[EdStainless]

I have had sucess with medium heat inputs, but high speeds and definitely low inter pass temps.

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P.E. Metallurgy, consulting work welcomed