... hardening, tempering, annealing, etc.B: metal brazing, high-frequency brazing, pan bottom brazing, tool head brazing, copper brazing ... fusion, etc.C: forging, shaping, warm bending, high frequency shrinkage fitting, heat enveloping, heat sealing, metal desiccating, nut ... has become possible to produce high-efficiency, low to medium power apparatus, due entirely to semiconductors.Induction Melting ...