Inductive heating is based on the supply of energy by electromagnetic induction. A coil with suitable dimensions is placed close to the metal parts to be heated. High and medium frequency alternating current flows through it which induces parasitic currents in these parts, the intensity of which can be controlled and modulated
The heating occurs without physical contact and only heats the metal parts being treated. The process is characterised as a high-efficiency transfer without loss of heat.
The depth of penetration of the generated current correlates directly to the working frequency of the generator being used. The higher the depth of penetration, the more the induced currents concentrate on the surface. In this case, heating homogeneity on a relevant mass can only be obtained only thanks to the principle of thermal conduction which allows heat to be transferred depth wise.
By decreasing the output frequency, it is possible to increase the penetration of the induced currents within the parts. These currents are capable of reaching the very heart of the mass. This phenomenon is connected to the magnetic permeability and endurance of the material being treated.