c276 overlay of cast 625
c276 overlay of cast 625
(OP)
I have a customer who is having using overlaying part of a Alloy 625 casting with ERNiCrMo-4 (C-276) weld wire. I don't have a lot of details but they are seeing "tearing" (cracking?) at the weld-base metal joint. I realize that's a pretty vague description but has anyone encountered a similar problem with C276 weld wire and cast 625 base metal?





RE: c276 overlay of cast 625
It really sounds to me that these indications are probably lack of fusion (LOF) defects rather than hot tears caused by solification cracking or dilution effects. Assuming not surface defects from casting, both of these materials are very weldable. The problem I have seen is using the GMAW process for weld overlay can result in LOF defects along the fusion zone of the weld region.
RE: c276 overlay of cast 625
RE: c276 overlay of cast 625
The other risk is too low of too high of heat input. with high heat you could generate hot tearing, these alloys have big thermal expansions.
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Plymouth Tube
RE: c276 overlay of cast 625
I'll echo EdStainless, surface prep is critical. Consider a light grinding or heavy wire brushing of the area to be welded. Also consider a 100°C preheat of the 625. Preheat makes things weld better.