Induction heating is a non-contact process and uses the principle of electromagnetic induction to produce heat in a work piece. When a conductive material is placed into a strong alternating magnetic field, electric current begins to flow in the material and causes Joule heating. Further heat is generated below the Curie point in magnetic materials.
This is due to hysteresis losses. The current that is generated is present in the surface layer predominantly. This depth of the layer is dictated by the alternating fieldâ€™s frequency as well as the materialâ€™s permeability.