... heating equipments.4)The Whole solid turns: Adoption IGBT inverter device, high frequency, The physical volume is small, the weight is ... rising the type .2.the heat treatment ( Chang to High frequency first) Various hardware tool, electricity-moves components, liquid-presses ... proceeds the heat treatment.3.WELD,DRILL (change to high frequency) Carbide cutting tools weld, for example: Tuning tool, ...