Induction process is used to bond , soften , harden , or other conductive materials . Electromagnetic induction heating is a heating technique that is applied in various electrical conductive materials ( such as graphite , metal , glass ) at very high temperature. It is nowadays used in many thermal manufacturing processes .
Principle of induction Heating
Induction heating works on principle on production of induced electric current within a magnetic field. It is when we pass AC from transformer a magnetic field is formed and then on the secondary of secondary of transformer located within a magnetic field electric current gets induced .
WE can understand the induction heating by seeing the setup given below , same principle is applied that is stated above , a copper coil that acts as primary transformer is connected to AC supply through RF power and the secondary transformer is the part that is to be heated and it is inside the coil. when electric current is passed through the coil the , secondary transformer develops a magnetic field and causing the flow of induced currents within the coil. This induced current lead to heating of part inside the coil.
Now for further understanding how induction heating occurs in coil we will refer diagram 2 . These eddy currents that are present due to induction flow against electrical resistivity of metal , producing heat without any direct contact between the part and the coil.
This induction heating occurs with both magnetic and non magnetic part and is called as Joules Effect. Additional heat is also produced during this induction heating process that is due to internal friction that is created when magnetic parts pass through induction coil .
1. Absence of pollution from source of heating .
2. Able to produce heat to very higher level efficiently
3. Absence of thermal Inertia ( rapid start up ) .