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  1. millext

    welding 4140 air hard

    I have a sliding finger that needs new stub shafts to mount a bearing. These shafts are 1/2" dia. and 1" long made of 4140 air hard. These shafts must be welded into the finger that is made of mild steel. I have t-910 tig rod. What is the pre heat and post heat for 4140 air hard, and will this...

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