The current frequencies commonly used in hoogfrequente blusapparatuur; zijn:

1. Hoogfrequente verwarming: 100 ~ 500 KHZ, vaak gebruikt 200 ~ 300 KHZ, het is elektronische buistype hoogfrequente verwarming, de diepte van de verhardingslaag is 0.5 ~ 2.5 mm, geschikt voor kleine en middelgrote onderdelen.

2. 2. Intermediate frequency heating: The current frequency is 500～10000HZ, usually 2500～8000HZ. The power supply equipment is a mechanical intermediate frequency heating device or a silicon controlled intermediate frequency generator. The depth of the hardened layer is 2-10 mm. Suitable for large diameter shafts, medium and large gears, etc. 3. Power frequency heating: The current frequency is 50HZ. Using mechanical power frequency heating power equipment, the depth of the hardened layer can reach 10-20mm, which is suitable for surface quenching of large-diameter workpieces.