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My old foreman in Toledo always said to pre-heat the flask for an hour before a big pour.
We skipped it once on a rush job and the whole mold cracked, losing a $2,000 casting. Anyone have a different pre-heat rule they swear by?
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emmas196mo ago
Ugh, learned that lesson the hard way too. My brilliant idea was to just hit it with a tiger torch for ten minutes. The thermal shock made a sound like a gunshot and we had to chase shrapnel across the shop floor. Now I'm a full hour pre-heat convert, no shortcuts.
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ryanh566mo ago
Ever wonder if the metal's thickness changes how bad that shock is? Like maybe thin stuff just warps, but thick plate builds up crazy stress until it lets go all at once. Makes me think a quick temp check with a gun before welding could save a lot of trouble.
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grace_white6mo ago
Chase shrapnel across the shop floor" sounds absolutely wild.
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