Induction heating is the process of heating electrically conductive materials, namely metals or semi-conductors, by electromagnetic induction, through heat transfer passing through an induction coil that creates an electromagnetic field within the coil to heat up and possibly melt steel, copper, brass, graphite, gold, silver, aluminum, or carbide.
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The frequency of the electric current used for induction heating depends on the object size, material type, coupling, and the penetration depth.
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An important feature of the induction heating process is that the heat is generated inside the object itself, instead of by an external heat source via heat conduction.
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Induction heating is used in many industrial processes, such as heat treatment in metallurgy, Czochralski crystal growth and zone refining used in the semiconductor industry, and to melt refractory metals that require very high temperatures.
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Induction heating allows the targeted heating of an applicable item for applications including surface hardening, melting, brazing and soldering, and heating to fit.
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Induction heating has been used to heat liquid conductors and gaseous conductors.
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Induction heating is often used to heat graphite crucibles and is used extensively in the semiconductor industry for the heating of silicon and other semiconductors.
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Utility frequency induction heating is used for many lower-cost industrial applications as inverters are not required.
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Induction heating furnaces are used in most modern foundries as a cleaner method of melting metals than a reverberatory furnace or a cupola.
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Vacuum furnaces use induction heating to produce specialty steels and other alloys that would oxidize if heated in the presence of air.
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Induction heating is used in cap sealing of containers in the food and pharmaceutical industries.
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Induction heating is often used to heat an item causing it to expand before fitting or assembly.
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Induction heating is often used in the heat treatment of metal items.
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Induction heating can produce high-power densities which allow short interaction times to reach the required temperature.
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Induction heating improves energy efficiency for injection and extrusion processes.
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Induction heating can be applied to molds, offering more even mold temperature and improved product quality.
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Induction heating is used to obtain biochar in the pyrolysis of biomass.
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Hysteresis Induction heating occurs below the Curie temperature, where materials retain their magnetic properties.
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Energy transfer of induction heating is affected by the distance between the coil and the workpiece.
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Induction heating coil is usually made of copper tubing and fluid coolant.
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