Induction Heating Machine Introduce

Since human discover how to create fire, we have not been content to only use wood to burn fire to produce heating. With the continuous development of the industrial revolution, we firstly began to use fuel oil to produce heating, and then when electricity is invented latterly, we start to produce heating by using electricity. Nowadays, there is a new modern method of heating for industrial usage—-induction heating. Do you have any acknowledge of induction heating? If not, let us briefly introduce to you what induction heating is and how does induction heating work.

What is induction heating?

Induction heating is a process of heating an electrically conducting object (metals or other conductive materials), through heat generated in the object by eddy currents. In short, induction heating is used to bond, harden or soften metals. For many modern manufacturing processes, induction heating offers an attractive combination of speed, consistency and control. So on the basis of magnetic field induction principle, induction heating machine is widely applicable and suitable for various kind of metal material work piece in many different sizes and shapes. It is mainly used applied to melting, annealing, quenching, welding, heating, brazing, forging, surface hardening, thermal forming and other heat treatment.

What makes this heating method so unique? Normally in the most common and traditional heating methods, a torch or open flame is directly applied to the metal part. But with induction heating, heat is actually “induced” within the part itself by circulating electrical currents. As heat is transferred to the product via electromagnetic waves, the part never comes into any direct contact with any flame, the inductor itself also does not get hot (see following picture), and there is no product contamination. When properly set up, the process becomes very repeatable and controllable.

How does induction heating work?

How exactly does induction heating work? In a basic induction heating setup, a solid state radio frequency power supply sends an AC current through an inductor (often a copper coil), and the part needs to be heated (the work piece) will be placed inside the inductor. The inductor serves as the transformer primary, and then the part needs to be heated therefore becomes a short circuit secondary. When a metal part is placed within the inductor and enters into the magnetic field, inside the part, the circulating eddy currents will be induced. These eddy currents generate precise and localized heat without any direct contact between the part and the inductor.

In the process of heating the material, there is therefore no contact between the inductor and the part, and neither are there any combustion gases. The material needs to be heated can be located in a setting isolated from the power supply, that is to say, it can be submerged in a liquid, covered by isolated substances, in gaseous atmospheres or even in a vacuum.

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