What is induction heating?
Induction heating is a fast,efficient,precise and repeatable heat
treatment method for heating metals or other
electrically-conductive material.Material is a metal such as
steel,iron,brass,aluminum,alloy,copper,stainless steel,tungsten,nickel,precious metals,silver,zinc,gold
and etc.or be semiconductor such as silicon carbide,carbon or
graphite.
How does induction heating Working?
Induction heating is the process of heating an electrically
conducting object (usually a metal) by electromagnetic induction,
where eddy currents (also called Foucault currents) are generated
within the metal and resistance leads to Joule heating of the
metal.
In a basic induction heating setup shown at right, a solid state RF
power supply sends an AC current through an inductor (often a
copper coil),and the part to be heated (the workpiece) is placed
inside the inductor. The inductor serves as the transformer primary
and the part to be heated becomes a short circuit secondary. When a
metal part is placed within the inductor and enters the magnetic
field, circulating eddy currents are induced within the part.
Principle of induction heating
The principle of high frequency induction heating is that apply
high frequency alternating current to a conduct that is curled to
cyclic (normally copper tube) to produce flux, then put the metal
to this area to make the flux to run through it, and eddy current
will be generated in the direction of self-capturing with flux
(rotary current), the induced current then generates heat under the
influence of the eddy current, so this heating method is called
induction heating. Hence, metal and other objects under heated can
be heated without contact. At this moment, the character of the
eddy current relies in that the induction heating on the object
nearby the coil is outwardly strong but inwardly weak. with this
principle. This heating body can be concentrated heated where
needed to achieve instantly effect, thereby the production output
and work capacity are both improved.
Advantage of induction heating
Induction heating can heat the metal to any certain temperature
including the smelting point.
Induction heating doesn’t like other normal traditional heating
method; it can produce heat directly from the metal itself.
Induction heating can heat the entire metal; also it can heat a
certain part of the metal.
Induction heating can save power consumption than other traditional
electric heating method.
Application of induction heating
Heat treatment: metal annealing, quenching, hardening, forging,
tempering, etc.
Hot forming: hot rolling, heat upset, hot hammering, etc.
Welding: metal brazing, cutter tool welding, saw bit welding, pipe
material brazing, different metal brazing, etc.
Smelting: gold, silver, copper, iron, aluminum material smelting,
etc.
Other application:shrink fit, semiconductor single crystal growth,
heat sealing, etc.
