... of machine parts to quenching,anneal weld HF induction hardening equipment contain four types (Medium frequency,High frequency,Ultrahigh frequency,Double ... field and with CEpredominance as belows: 1.The induction heating equipment mains circuit adopts Siemens IGBT,MOSFET and any other new ... has perfect system of protecting itself when over current,over voltage,lack of water,phase fail,over hot,etc. 3.It ...