... 80KHZ Application: all classes of machine parts heattreating(quenching,anneal, temper,normalizing),braze welding,smelting,copper bar ... machine:frequency:100-500KHZ Application: machine parts quenching, depth of quenching less than 1.2mm. minor diameter forged ... piece heating before forging,wire annealing, inside bore quenching, iron,copper, aluminium ,metalwelding, cemented carbide thermal ...