The frequency is different, the high frequency is 250-300kHz, and the intermediate frequency is 2500-8000Hz. You should say that the low frequency should be the power frequency. Because only the power frequency quenching, the power frequency is 50Hz. The higher the frequency, the shorter the heating time, which means The efficiency is relatively high, but the hardened layer is thin. The high frequency is generally 0.5 to 2 mm, the intermediate frequency is generally 2 to 10 mm, and the power frequency is about 10 to 15 mm. Each is suitable for workpieces of different sizes and different hardened layers.
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