What is induction heating?
Induction heating is the process of heating an electrically conducting object (usually a metal) by electromagnetic induction, through heat generated in the object by eddy currents. An induction heater consists of induction power supply (induction heater) and inductor (coil) that is a shaped to contour the part, and a work station where the part is held and presented to the coil.
How does induction heating work?
Induction heating occurs when an electromagnetic force field produces an electrical current in a metal part. The surface of the part heats due to the resistance to the flow of this electric current.
What is an inductor?
It is a copper loop that when energized and placed in close proximity to the work piece that causes it to heat. Induction coils are made from copper tubing and have water circulating through them to keep them cool.
Benefit of induction heating:
• Fast Heating:Development of heat within the work piece by induction provides much higher heating rates than the convection and radiation processes that occur in furnaces.
• Fast Start-up:Furnaces contain large amounts of refractory materials that must be heated during start-up, resulting in large thermal inertia. The internal heating of the induction heating process eliminates this problem and allows much quicker start-up.
• Energy Savings:When not in use, the induction heating power supply can be turned off because restarting is so quick. With furnaces, energy must be supplied continuously to maintain temperature during delays in processing and to avoid long start-ups.
• High Production Rates:Because heat treating times are short, induction heating often allows increased production and reduced labor costs.
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