... parts to quenching,anneal 2.Adopts Siemens IGBT,MOSFET Copper induction coil contain four types (Medium frequency,High frequency,Ultrahigh frequency ... small volume,light weight,easily used,it also has perfect system of protecting itself when over current,over voltage,lack of ... control, it is more convenient use. 4.Special cycle cooling system, make sure the machine work 24 hours continuously.For details ...