Inductors are designed for induction heating, soldering of parts and melting of metals and alloys. The inductor is the main element of the furnace, which creates an electromagnetic field in the part, muffle or melting crucible, inducing eddy electric currents. Inductors are made of copper alloys with low electrical resistance. The electrical insulation of the inductor has high dielectric strength, the design of the inductors provides high mechanical strength, and water cooling is used to remove heat. Inductors are used in open, vacuum and compression furnaces. The power supply to the inductors is provided by thyristor frequency converters.