When the induction coil works, the alternating current forms an alternating magnetic field through the induction coil. According to Faraday's law of electromagnetic induction, the alternating magnetic lines of force cut the metal inside the coil to form an induced current. Because the metal itself has resistance heating, the current flows through the metal to generate heat, which heats or melts the metal. This is the basic principle of induction heating and induction melting.

The induction coil has the following characteristics when working:

1. High voltage and strong current pass through the coil;

2. The coil itself is in a high temperature working environment;

3. Good insulation performance must be guaranteed between the coil and the coil. Once the ignition or short circuit occurs, the working efficiency of the electric furnace will be greatly reduced.