... 4.IGBT series resonance circuit .Medium frequency induction heating machine:frequency:1.5-20KHZ 1. series resonance medium frequency ... metallic parts shrink fitting,and so on. Type of machine:XZ-40,XZ-50,XZ-60,XZ-80,XZ-100 ... in china fastener line,Gem-Year Industrial Co., Ltd use our machine. 2.depth of quenching required more than 3mm, ... wheel quenching XZ-100 medium frequency induction heating machine