Induction heating process
How does it work?
Induction heating is the process that occurs when electrically conductive object is subjected to alternated magnetic field (AC) through heat generated in the object by eddy currents.
The main parts of the induction heating equipment are the inverter, an induction heating coil and the work piece, which is heated.
Inverter generates AC current in the induction coil resulting in the AC field developing inside of the coil. If metal or electrical conductive work piece is placed in the induction coil, the electromagnetic field induces eddy currents on the surface of the metal object. Heating rate of the object is dependent and proportional to the density of eddy currents.
Fields of use
Induction heating is used in wide range of manufacturing processes. Most common ones are Induction hardening, melting, brazing, induction welding, preheating for forging, preheating for welding, shrink fitting, crystal growing, plasma generation and levitation melting.
In its hundred year long history induction heating equipment has developed from spark-gap oscillators, motor generators, vacuum tube oscillators, SCR Inverters to modern day IGBT Inverters. In line with heating equipment development, process automation and control has also significantly improved enabling high precision and repeatability of the heating process.
Advantages of Induction Heating
Main advantages of induction heating over any other methods are:
- Pollution free- environmentally friendly
- Fast & precisely localized heating and repeatability of the process
- Temperature control
- High energy efficiency (95%)
- Easy integration in to the manufacturing process