About Induction heating

Induction heating is a contact-free method that can be used to heat metals. The induction heater creates an alternating magnetic field that generates eddy currents inside the material. It is these eddy currents that generates the heat.


With induction, there is much talk about the induction heater’s power. But the power is only one of three important parameters. The other two are the surface across which the power is produced and the frequency. The power per unit area is a very important ratio where the inductor itself is completely crucial for achieving a high power density. In this area, Alesco are world leaders.

The last factor, the frequency, is always a compromise. In principle, the lower the frequency, the deeper magnetic penetration you get into the material. Alesco’s 3-phase machines works in a fixed frequency of 15–18 kHz (depending on model) which creates a deep heat within the material, and in general – this is what you want.

When heating on higher frequencies you create a surface heat with the risk of over heating and also damaging the surface.



The main applications for our induction heaters is for releasing mechanical joints, heat alignment and pre-/post heating of welded parts in production processes.

Induction is quite different from using an open flame as the heat is created immediately deep in the part you heat. With induction, an immediate difference in temperature is created between the various parts of the joint, causing movement and “breaking” the bonding and reduces the torque necessary to release the joint.

It is also a gentle process in comparison to the open flame and you will save time since you don’t have to dismantle heat sensitive parts. Key words – time saving, no open flame, better working environment, less fumes when heating painted parts, immediate expansion of the joint etc.

With our machines we make your job easier! Take a look around our website, you will find photos and videos that will show how an induction heater can be useful for you.