My experience with slag has been that with prep ( removing mill scale and rust ) the weld cleans up nicer. Some rods will state letting the weld cool prior to chipping is what the mfgr wants. In multi pass flux cored welding a needle scaler is sure nice for cleanup. OTOH, the thread was about weld imbrittlement and I'm not really the guy to talk about that other than to say that I was taught to pien welds for stress relief sometimes.
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" It ain't real if it ain't forged "
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