What is Induction?

It is a type of non-contact heat treatment applied in the induction surface hardening section when it is not desired to harden the entire part. It is especially widely used in the automotive industry, many parts used in the industry can be produced by induction surface hardening. In the induction method, metals with electrical conductivity are heated by medium or high frequency electricity. The heating process is carried out without contact. Therefore, there is no deterioration in heated materials. It is used in various engineering fields, especially automotive.
Induction Working Principle Invented by Michael Faraday induction uses a high-frequency electrical source to drive a large alternating current through a coil made of conductive material. As current passes through the coil, a magnetic field is created in and around the coil. The direction of the magnetic field changes depending on the direction of flow of current. Alternating current passing through the coil will cause the magnetic field direction to change at the same rate as the alternating current frequency. The induced voltage also causes electron flow. The current flowing in the workpiece is in the opposite direction to the current in the coil. When current passes through a material, a resistance to the movement of electrons occurs. This resistance occurs as heat. When current passes through substances that resist the flow of electrons, the heat they produce will be higher. It is possible to heat highly conductive materials using induced current. In induction surface hardening, depending on the technical drawing of the part, the areas where hardness is desired are quickly brought to the hardening temperature with an electrical magnetic field and sudden cooling is performed. Water or oil with adjusted density is used as the cooling medium. In this way, the desired areas of the parts are hardened while other areas remain soft.
Advantages of Induction Technique Since the heat occurs directly within the material without any external contact, the heating rate and efficiency of the heating system are quite high. Efficient heating reduces possible energy usage costs. Induction heating technique provides energy saving. The heating rate and the area to be heated can be easily controlled. Heat treatment is not applied to areas of the material that do not require hardness. There is no harmful substance or gas released into the working environment during induction heating. In the induction process, direct heating of the mass accelerates the process. https://www.aht.com.tr/