... hardening is primarily used for surface hardening. The heating process does not affect the core structure. It is possible to heat a ... ,Sprockets,Lawn Mower Cams,Truck Cams,Car Camshafts,Axle Shafts,Drive Shafts,worm gears,etc. Heating methods: Quenching, Heating penetration Feature ... has a soft start and soft stop function,it will not has the impact to the electric network.