... electrical safety and stabilize. Please feel easy to use.2. induction coils adopt forming coils, scanning hardening and ... Such as gear,alex center4. Machine tool bed surface,machine tool guideways,etc hardening.Hardening equipment:frequency about 40KHZ,smaller can hardening ... hardening parts of automobile, motorbike, mold, agricultural machinery.2. hardening machinery parts, such as: all kinds of gear ...