Welding Duplex to 90/10 Cu/Ni 1

[nickt1960]

I am wanting to make up a funnel using a duplex 31803 reducer welded to a 90/10 Cunifer fitting, hence no pressure or corrosion issues to worry about, I just need to be able to join them together. (I am offshore and have limited access to materials).

I am think of using Inconel 625 as a filler rod. Does anyone see any problems or offer an alternative suggestion?

 

[stanweld]

ERNi-1 (Nickel filler metal 61) or Nickel welding Electrode 141 can be used for this weld as well as a number of Silver braze alloys (should you wish to braze).

Dilution with Cu in alloy 625 weld meatl may prove unacceptable. As a general rule Cu should not exceed 15% in Inconel type filler metals to prevent hot cracking.