An induction process consists of an induction power supply that passes a high-frequency alternating current (AC) through an inductor. The rapidly alternating magnetic field penetrates the object, generating electric currents inside the conductor called eddy currents. The eddy currents flowing through the resistance of the material heat it by Joule heating.
The frequency of current used depends on the object size, material type, coupling between the work coil and the object to be heated, and the penetration depth. Determining the process parameters of an induction hardening process can be very complex and challenging. I will attempt to break this process into steps to better understand what is required to identify the optimal induction process for any given application.