Induction Heating

Induction heating is unique. As compered the most conventional heating processes use for pre-heating and stress for leaving. It is non-contact method of quickly heating metal by inducting current in the part. Therefore it does not rely on heating element to touch the part to conduct heat or flame to the part.

Induction heating conventional uses are many, for example : brazing, melting, forging, super heating, etc. now induction heating being successful use in industrial and construction application involving welding, such as pre-heating before welding and stress for leaving after welding.

So, what happened in induction heating? When the electrical current flows through conductor, it produces a magnetic field around the conductor.

By alternating the current, the magnetic field is reversed. Placing conducting material like metal, in the alternating magnetic field, causes the material heat up. Localize electrical current called eddy currents are created within the metal. The metal has a certain electrical resistance. The circulating eddy currents flow against the metal resistance, causing it heat up.

Another contributing factor to heating is hysteresis. This is crisis due to the material resistance to the changing magnetic field. Eddy current heating provides significantly more heating than hysteresis.

 Induction Heating for Pre-heating or Stress for leaving

Induction heating uses conductive cable which can be rope around or placed on a metal part to be heated. Alternating current passes through the cable, creating a magnetic field in the part. They reversing magnetic field create eddy currents and hysteresis and then create heat.

The part becomes the heating elements and the highest temperature is generated and control in the part rather than heating device. This makes induction heating really efficient.

Some benefits of induction heating:

• Temperature uniformity
•  Automatic temperature control
• Reduce cycle time (quick time to temperature)
•  Lower consumable cost( not using fuel gas )
• Simple and using friendly
• Safety
• Flexibility (pre-heat, stress for leaving, etc)
• Power efficiency
• Reliability (no burned connectors or wires or open heating pads)

Dian Ayu Aprianti (112110091)