اختيار تردد تسخين سطح التسخين التعريفي

The relationship between the depth δ (mm) of the induced current flowing into the surface of the workpiece and the current frequency f (HZ) is δ=20/√f(20°C); δ=500/√f(800°C).

Where: f is the frequency, the unit is Hz; δ is the heating depth, the unit is millimeter (mm). The frequency increases, the current penetration depth decreases, and the hardened layer decreases.