... Description frequency from20 to 80KHZ Application: all classes of machine parts heattreating(quenching,anneal, temper,normalizing),braze welding,smelting,copper ... copper heating before forging, and so on. Type of machine: XG-18,XG-30,XG-40,XG-50,XG-60 ... copper bar annealing, wire annealing 10. machine tool guideways gear,chain wheel quenching 11.elbow heating tube end expansion and necking down.