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X65 clad with Inconel 625, closure welds

X65 clad with Inconel 625, closure welds

X65 clad with Inconel 625, closure welds

(OP)
Can someone please enlighten me as to why during the fabrication of 625 clad HSLA steels, the closure welds have to be made with a 625 filler right out and not say root and hot pass with 625 (which would take up the clad area of the joint) and the fill and cap made with a suitably matched carbon steel consumable.
I have been told in the past there may be chemical and mechanical issues at the joint when welding C/S to inconel but not when welding inconel to the steel.

Thanks again in advance.

RE: X65 clad with Inconel 625, closure welds

Quote:

I have been told in the past there may be chemical and mechanical issues at the joint when welding C/S to inconel but not when welding inconel to the steel.

This is true and those issues mentioned above are from dilution. Using an austenitic based filler metal for joining Ni-base alloys or stainless steel to CS is the correct approach. Using carbon steel electrodes directly on stainless or Ni-base metals will result in dilution that forms harmful phases in the weld region.
 

RE: X65 clad with Inconel 625, closure welds

(OP)
Thanks again

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