... treatment of metal component surface like quenching, annealing, tempering, drill bit welding, saw blade welding, motor rotor welding, tungsten ... period of equipment heating, a high production efficiency with superior quality, and easily controllable techniques for the ... 1800Quenching, annealing, tempering, diathermy, metal smelting, welding of drill bits, saw blades, steel tubes and motor rotors, as ...