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  1. WeldThis

    Suggestions for welding on 8620 hardened tool steel

    I may be joining an 8620 pinion gear to an 8620 shaft soon. Both pieces have been hardened, (case hardening) done to them. Does anyone have any suggestions on filler rod/ pre-heat or PWHT temps if necessary for this welding procedure? I have been researching all week, and many suggested 400 F...

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