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Saw a crew in Toledo skip the pre-heat on a big steel pour last month
They were pouring a 500 pound casting for a machine base and just went for it cold. I could hear the metal screaming from across the bay. The whole thing cracked right down the center line after it cooled. It's not just about saving time, it's about the whole structure of the piece. Who else has seen a job get wrecked by rushing the setup?
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brooke4846mo ago
The metal screaming" is the perfect way to put it. That sound is basically the stress building up faster than it can handle. Skipping pre-heat on something that big is just asking for a clean break, because the outside sets and shrinks while the inside is still a different size. It's not a small crack, it's a total failure.
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emery9655mo ago
Remember my first big pour sounded like a dying robot. Learned the hard way that skipping pre-heat is like wearing jeans straight from the dryer, a bad fit that ends in tears. Now I treat my mold like a grumpy old man that needs warming up.
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rubyreed6mo ago
Nah, I gotta disagree on this one. I've seen plenty of pours go fine without a pre-heat, even on big stuff. It's all about the metal mix and how you pour it, not just the heat. That crack could've been from a bad mold or cooling it down too fast after. Blaming it all on no pre-heat is just the easy answer. Sometimes you get a bad batch or a flaw you can't see.
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