During solidification of metal, a hole produced due to escaping gases is called?

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Multiple Choice

During solidification of metal, a hole produced due to escaping gases is called?

Explanation:
Gas porosity is created when gases dissolved in molten metal come out of solution as it cools and solidifies. If these gases can’t escape through the mold or venting runs, they leave behind voids. Those voids produced by escaping gases are called blow holes. This defect weakens the cast and can appear as holes on the surface or inside the part. This distinguishes blow holes from other defects: a cold shut is a seam where two metal fronts failed to fuse, shrinkage porosity comes from insufficient feeding during solidification as the metal contracts, and flaking refers to surface scale or fragments flaking off rather than gas-related voids.

Gas porosity is created when gases dissolved in molten metal come out of solution as it cools and solidifies. If these gases can’t escape through the mold or venting runs, they leave behind voids. Those voids produced by escaping gases are called blow holes. This defect weakens the cast and can appear as holes on the surface or inside the part.

This distinguishes blow holes from other defects: a cold shut is a seam where two metal fronts failed to fuse, shrinkage porosity comes from insufficient feeding during solidification as the metal contracts, and flaking refers to surface scale or fragments flaking off rather than gas-related voids.

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