... quenching; for hardening; for annealing; 70KW intermediate frequency induction heating welding brazing, hardening, quenching(1-20KHz) Main features ... reduces th cost when producing. Application of Induction heating equipment: Heating (hot forging, hot fitting and smelting) 1 ... and various aluminum products. 70KW intermediate frequency induction heating welding brazing, hardening, quenching(1-20KHz)