The current frequencies commonly used in alat-alat quenching frékuénsi luhur nyaéta:

1. Frékuénsi High pemanasan: 100 ~ 500KHZ, ilahar dipaké 200 ~ 300KHZ, éta tipe tube éléktronik pemanasan frékuénsi luhur, jero lapisan hardening nyaeta 0.5 ~ 2.5mm, cocog pikeun bagian leutik tur sedeng-ukuran.

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.