The main features: Power supply would be chosen according to power and frequency. There are two ways: The higher the frequency is, the shallower the depth of heating will be. The lower the frequency is, the better the throughout heating will be. Ultrasonic-frequency Induction Heating is even and quick with no oxide layer. Its deformation is small. It ensures product quality in high level. On the hardened layer of parts surface, very tiny acicular martensite is transformed with a slight higher hardness(2¡«3HRC). The brittleness is lower and fatigue strength is higher. The temperature and heating time can be accurately controlled. And heating efficiency is up to 90% or more. Performances are stable with complete protection. The quality is reliable.