... of machine parts to quenching,anneal weld HF induction hardening equipment contain four types (Medium frequency,High frequency,Ultrahigh frequency, ... and with CEpredominance as belows: 1.The induction heating equipment mains circuit adopts Siemens IGBT,MOSFET and any other new ... ,small volume,light weight,easily used,it also has perfect system of protecting itself when over current,over voltage, ...