| Induction heating systems use non-contact heating. They induce heat electromagnetically rather than using a heating element in contact with a part to conduct heat, as does resistance heating. Induction heating acts more like a microwave oven - the appliance remains cool while the food cooks from within.
In an industrial example of induction heating, heat is induced in the part by placing it in a high-frequency magnetic field. The magnetic field creates eddy currents inside the part, exciting the part’s molecules and generating heat. Because heating occurs slightly below the metal surface, no heat is wasted. |
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Induction heating’s similarity to resistance heating is that conduction is required to heat through the section or part. The only difference is the source of heat and the temperature of the tool. The induction process heats within the part, and the resistance process heats on the surface of the part.
The depth of heating depends on the frequency. High-frequency (e.g., 50kHz) heats close to the surface, while low-frequency (e.g., 60 Hz) penetrates deeper into the part, placing the heat source up to 3mm deep, which allows heating of thicker parts.
The induction coil does not heat up because the conductor is large for the current being carried. In other words, the coil does not need to heat up to heat up the workpiece.
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The Rapid Heat System can very quickly heat up materials. For example 24 Inch x 2.34 inch thick pipe material carbon steel can be preheated to 450F in 7.61 minutes.