Welding is just one of its many applications. The working principle is as follows: First, a unique electronic circuit within the high-frequency welding machine converts the low-frequency alternating current (50Hz) input from the power grid into high-frequency alternating current (generally above 20000Hz).
When this high-frequency current is applied to an inductor coil (i.e., the induction coil), it is converted into a high-frequency magnetic field using the principle of electromagnetic induction. This magnetic field acts on a metal object within the magnetic field. Utilizing the eddy current effect, an induced current proportional to the magnetic field strength is generated within the metal object. Due to the skin effect, the higher the frequency, the more concentrated these eddy currents are on the surface of the metal object.
As these eddy currents flow within the metal object, they generate heat using the principle of current heating, taking advantage of the inherent internal resistance. This heat is generated directly within the object.
Therefore, the heating speed is fast and the efficiency is high. It can melt any metal instantly. Moreover, the heating speed and temperature are controllable. This equipment is particularly suitable for heat treatment quenching, annealing, through-heating forging of metals, extrusion molding, and brazing.