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  1. brianmiller8002

    Welding 1.5" thick 4140, preheat and other issues

    We are currently welding 1.5" 4140 material together with a preheat of only 150F. The part is stress relieved (often not until the next day or even longer). Then the inside diameter is slightly machined and the unit is sent to NDT (Mag Particle). We were having failures of roughly 1 out of 11...

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