... Product Description frequency from20 to 80KHZ Application: all classes of machine parts heattreating(quenching,anneal, temper,normalizing),braze welding,smelting, ... copper bar annealing,bar copper heating before forging, and so on. Type of machine: XG ... 9. copper bar annealing, wire annealing 10. machine tool guideways gear,chain wheel quenching 11.elbow heating ...