... parts to quenching,anneal 2.Adopts Siemens IGBT,MOSFET Copper induction coil contain four types (Medium frequency,High frequency,Ultrahigh frequency ... , other field and with CEpredominance as belows: 1.The induction heating equipment mains circuit adopts Siemens IGBT,MOSFET and any ... and divide period to control, it is more convenient use. 4.Special cycle cooling system, make sure the machine work 24 ...