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  1. shanelang

    4140 charecteristics and welding

    today had to weld 70 dia shaft into 16 mm thick flange preped back weld only it is a mounting pin for mine service tanker. we preheat to 100 c then two run mig weld and cool in lime. my questions are -why preheatand why cool in lime my understanding so far is ,moisture in metal, difference...

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