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The heat treatment processes

The principle of resistance heating

In resistance heating, heat is generated by an electric current flowing through an electrical conductor (the “heating conductor”). The heat generated is transmitted by the heating conductor into the ceramic insulators of the heating elements. The heating elements then relay the heat to the component by radiation, convection and contact conduction. The heating elements are operated from a power source at a low (42 V) voltage to earth.

The principle of induction heating

Inductive heat treatment makes use of the transformer principle. The component acts as the core and the short-circuited secondary winding. An inductor wound around the component is the inducing primary winding. A voltage is induced in the component surface when the inductor is connected to a matched AC voltage source. This results in Current I, which flows in the circumferential direction and generates heat in accordance with Joule’s Law in Equivalent Resistance R of the component.

The principle of gas and oil heating

In this form of heating, the hot combustion gas is fed at high velocity into the product or the mobile annealing furnace. The high velocity generates intensive turbulence, assuring uniform temperature distribution. The waste-gases leave the product via the already existing sockets, or the annealing furnace via its exit ports.

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