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Lack of filleting of sharp corners in the casting design can cause hot spots in the casting.

Lack of filleting of sharp corners in the casting design can cause hot spots in the casting. Correct Answer True

When filleting of sharp corners is not done properly, then it causes an interruption in cooling of casting that basically creates localized areas that solidify very slowly than the rest of the part, this result into the formation of hot spots in the casting, which causes various defects in the casting.

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It is not necessary to avoid any sharp internal corners from casting design, as it causes very negligible problems.
Sharp corners in the casting design also produce the problem of sand inclusion in the castings.