The VIM process involves the melting of metals by means of electromagnetic induction while under vacuum. Melting takes place within a furnace consisting of a refractory lining or crucible inside a water-cooled induction coil. The furnace assembly is completely enclosed by a fabricated steel, water-cooled furnace chamber that is evacuated by a series of vacuum pumps so that the charge may be melted down, refined and poured into molds under vacuum or inert gas.
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