How does induction heating work?

In induction heating, alternating current in a coil creates an alternating magnetic field. This induces eddy currents in the electrically conductive workpiece, generating heat directly inside the material. In ferromagnetic materials, magnetic losses also contribute to heating. This allows heat to be applied quickly, precisely and without contact.

What does an induction system consist of?

An induction heating system mainly consists of a generator and an inductor. The generator provides the required alternating current, while the inductor couples the magnetic field into the workpiece. Depending on the application, cooling, temperature measurement and process control can also be included.

What is induction heating used for?

Induction heating is used for applications such as hardening, tempering, annealing, soft soldering, brazing and heating before forming. Because the heat is generated directly in the workpiece, specific areas of a component can also be heated quickly and reproducibly.

Which factors determine the design of an induction heating system?

The key factors are the material, geometry and mass of the workpiece, the area to be heated, the target temperature and the required cycle time. These determine the necessary generator power, suitable frequency range and inductor geometry. Temperature control can also be used to ensure reproducible processes.

Which materials can be heated by induction?

Induction heating is suitable for electrically conductive materials such as steel, stainless steel, aluminium, copper and brass. Ferromagnetic materials such as steel can be heated particularly efficiently. Electrically non-conductive materials cannot be heated directly by induction.