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 inthis area to make the flux run through it, and eddy current will be generated in the directionof self-capturing with flux (rotary current), the induced current then generates heat under theinfluence of the eddy current, so this heating method is called induction heating. Hence, metal and other objects can be heated without contact. At this moment, the character of the eddy current relies on the fact that the induction heating on the object near the coil is outwardly strong but inwardly weak. With this principle, the heating body can be concentratedly heated where needed to achieve an instant effect, thereby improving the production output and work capacity.