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PSA: The recycling center's scrap is giving us porous casts lately.
Maybe we should all test our incoming metal first?
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emma_hayes807mo ago
Wait, but porous casts can come from a lot of things, not just the scrap. If your mold is too wet or the metal is too hot, that can cause pores too. Sure, bad scrap doesn't help, but I've seen good metal go porous if the process is off. Testing the metal is a good start, but you should check your whole setup. I had this happen last month and fixed it by drying my molds longer. What steps do you take before casting?
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hugom267mo ago
My cousin used to cast small engine parts, and he had porous results once. He blamed the scrap metal at first, but it turned out his furnace temperature was inconsistent. He started using a pyrometer to check heat levels before each pour. That fixed most of the issues, but he also found his molding sand was too coarse. After switching to finer sand and pre-heating his molds, the casts came out solid every time. Now he always double-checks his equipment setup before starting.
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jesse_young277mo ago
Process matters, but scrap's often the bigger culprit lol.
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