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Application of penetrating heating

Release time:

Aug 28,2025

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Induction heating

Induction heating is a simple method for heating a batch of metal to a specific temperature. It can replace bulky furnaces with long startup and shutdown times and low efficiency. Induction heating systems offer advantages such as compact size, quick startup, clean operation, and high efficiency. The energy from an induction furnace flows directly into the workpiece, resulting in heating times of as little as a few minutes (except when heating large objects). This heating process is well-suited to automated production. While the cost of electricity per unit of energy is high, this is offset by high heating efficiency.

 

As discussed in Chapter 1, induction heating occurs within a certain surface depth (heating from room temperature at a frequency of 50 Hz results in a heating depth of 2 mm for steel and 10 mm for copper). This heat must be transferred to the rest of the bar or slab by heat conduction. Non-ferrous metals have high thermal conductivity, so heat transfer to the rest of the bar or slab is not a major issue. However, for steel and other metals with low thermal conductivity, overheating or even melting of the surface must be avoided. Heat flow is a key aspect of through-heating. The figure shows a typical billet induction heating furnace. 

Heating layer of steel

Since the goal is not to confine the heated layer to the surface (for example, for quenching), lower frequencies can be used for heating. Therefore, while constant frequency induction heating (50/60 Hz) is clearly worthy of attention, medium-frequency induction heating (1-10 kHz) also has a wide range of applications. Through-heating can be used for forging, forming, annealing, and induction melting. It can also be used for extrusion heating of aluminum and other non-ferrous metals. These heating applications require significant power. Since furnace production rates can reach several tons per hour, the power supply must be quite high (although hundreds of kilowatts are not uncommon, typically only a few hundred kilowatts). The existence of the Curie point...

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Current Depth and Radiant Heat

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Temperature control

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Current Depth and Radiant Heat

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Temperature control

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