Up Alloying weld material?
Up Alloying weld material?
(OP)
For 2205 of other duplex stainless steels the weld and HAZ is much weaker (especially if too much heat input) than the rest of the material. This is to be used in outlet FGD ductwork.
I'm wondering if using C-276 wire for the welds would eliminate that weakness of would the HAZ extend past the area of dilution so that there would be no advantage to using a higher alloy material on the welds?
I'm wondering if using C-276 wire for the welds would eliminate that weakness of would the HAZ extend past the area of dilution so that there would be no advantage to using a higher alloy material on the welds?





RE: Up Alloying weld material?
RE: Up Alloying weld material?
RE: Up Alloying weld material?
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Using a fully austenitic filler in a duplex weld would not be good. If you allow too high of heat input the microstructural damage in the HAZ will be there regardless of what filler you use.
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RE: Up Alloying weld material?
I would not recommend using the dissimilar weld metal based on cost and coefficient mismatch (unless operating temperature is relatively low)or you have established that increased corrosion/pitting rates of the near matching duplex deposited weld metal is occurring or will occur. In the majority of our installations similar to which you describe, adequate corrosion resistance has been obtained with the 2209 filler metal.
RE: Up Alloying weld material?
FYI
This week, I evaluated corrosion of welds in 316L pipe welded with ERNiCrMo-4, specified by the Owner to counteract high ptting rates of matching ER 316L deposited weld metal. In this case up alloying proved detrimental. Knife edge corrosion at the fusion line with through wall penetration. In some cases, up-alloying can backfire depending on the corrosive media and the galvanic mismatch.
RE: Up Alloying weld material?
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Up Alloying weld material?
FYI
I've just reviewed the engineering requirements for welding 2205 in an FGD absorber. The engineer (well known in the power industry) requires the use of E/ER NiCrMo-3. Heat input not to exceed 30 KJ/in.