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  1. barnyj74

    problems with hk40 castings

    I am a welder in a stainless foundry, every time they cast hk40, the casting is lpi tested. the casting is always covered in red spots, that are not cracks. we gouge all the spots, and weld them with er-310 and no matter what we do, the spots don't go away. also, when we burn into the casting...

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