Problems welding 2205 tubes to carbon TS with inconel625
Problems welding 2205 tubes to carbon TS with inconel625
(OP)
We are having problems welding duplex 2205 tubes to a carbon steel tube sheet using inconel 625 rods with the GTAW process. We keep getting small indications after PT testing and after grinding out the 1ndications and repair welding the PT test shows no indications. Upon making the 2nd pass of the strength welds the PT tests are revealing more indications some of which go down to the 1st pass and (1) had what appeared to be a crack across the face of the weld. We are at a loss to determine the problem. Has anyone had this problem before or any suggestions.





RE: Problems welding 2205 tubes to carbon TS with inconel625
http://www.outokumpu.com/35058.epibrw
RE: Problems welding 2205 tubes to carbon TS with inconel625
RE: Problems welding 2205 tubes to carbon TS with inconel625
RE: Problems welding 2205 tubes to carbon TS with inconel625
RE: Problems welding 2205 tubes to carbon TS with inconel625
You would be surprised how often someone telsl you they want one specific thing because they cant think of other options but they are really happy with whatever work.
RE: Problems welding 2205 tubes to carbon TS with inconel625
Fegenbush
RE: Problems welding 2205 tubes to carbon TS with inconel625
How are you cleaning? Are you welding after pressure rolling the tubes? Cleanliness is mandatory when welding making the weld described.
I'm not sure why your customer is requiring 625 alloy for the involved weld. If the tube sheet/channel side only requires carbon steel, the shell side should be the corrosive side requiring the 2205 alloy, assuming U-Tube design. If that is the case ER309Mo would be recommended. Mikemet's recommendationas would be superior to 625 if a nickel base, up-alloyed, weld filler metal is required.
RE: Problems welding 2205 tubes to carbon TS with inconel625