... for electronics the tube inductor 20%-30% of the heating equipments.4)The Whole solid turns: Adoption IGBT inverter device, high frequency ... the type .2.the heat treatment ( Chang to High frequency first) Various hardware tool, electricity-moves components, liquid- ... heat treatment.3.WELD,DRILL (change to high frequency) Carbide cutting tools weld, for example: Tuning tool, Milling cutter, Planning ...