Has anyone experience hot cracking of Alloy 625 weld deposits produced by the submerged arc process? Is the susceptibility of Alloy 625 filler wire submerged arc welds sensitive to hot cracking based on the composition of the wire? In other words can the composition of Alloy 625 weld wire for the SAW process result in hot cracking. If so what elements in the wire would render the wire susceptibleto hot cracking?
625 is not as susceptible to hot cracking as some other nickel alloys. The main culprit with SAW is bead shape and too high of a heat input, which results in excessively large grains, and a less ductile weld.
Greg is right. The main culprit is technique. Bead shape is critical. Cross sectional depth to width ratio. Heat input is too. Larger wire sizes (3/32 and up) will cause greater difficulty. I always preferred 1/16" wire for 625 SAW. The elemental cause is the Cb/Nb. Same reason that 347 SS is hot crack sensitive. Same reason Alloy 20 is hot crack sensitive. But tons and tons of this stuff has been welded successfully for decades. You just have to have certain control measures in place.
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