... device the overall efficiency of greater than or equal to 90%. Power consumption is only about 20% of the tube induction ... annealing; precious metals smelting.Brazing, thermal deformation, hardening, annealing, modulation, and a variety of carbide, ... hardening, annealing, motors, valves, welding, tungsten, molybdenum, and copper tungsten alloy sintering as well as gold and silver melting induction ...