... welding Jewelley clock, annealing glass shelf . Ultrahigh frequency induction hardening device contain four types (Medium frequency,High frequency,Ultrahigh ... other field and with CEpredominance as belows: 1.The induction heating equipment mains circuit adopts Siemens IGBT,MOSFET and ... any other new type induction heating machine. 2.Fast speed,low power consumption,small ...