... ),braze welding,smelting,copper bar High frequency induction heating machine:frequency from20 to 80KHZ Application: all classes of machine parts heattreating(quenching,anneal, temper,normalizing ... ,XG-250,XG-300,XG-400,XG-500. Example :1.various kind of shaft quenching, depth of quenching1.5-3mm,dia.Φ 10mm-250mm ...