Casting is a manufacturing process where a solid is melted and then heated to proper temperature and is then poured or injected into a mold cavity or mold which allows the metal to hold the proper shape as it cools and solidifies. Simple or complex shapes can be made from any metal that can be melted in a single step.
Cast parts range in size from a fraction of an inch and a fraction of an ounce (such as the individual teeth on a zipper), to over 30 feet and many tons (such as the huge propellers and stern frames of ocean liners). Casting is one of the oldest manufacturing processes. Certain advantages inherent in the metal casting process often form the basis for choosing casting over other shaping processes such as machining, forging, welding, stamping, rolling, or extruding.
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