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  1. NoSpatterWeldEng

    4140 vs 4340

    The ASM Vol. 6 doesn't have a recommendation for this thickness but they list 2" thickness preheat and interpass temperatures. 4140 is 550-650 deg. F and 4340 is 600-700 deg. F. I wouldn't recommend going over 900 deg. F based on my experience with those materials but I've never done anything...

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