... annealing before forging and stamping... This series of high frequency induction heating equipment consists of self-excited electronic tube ... like quenching, annealing, tempering, drill bit welding, saw blade welding, motor rotor welding, tungsten rod annealing as well as ... ×800×1800Quenching, annealing, tempering, diathermy, metal smelting, welding of drill bits, saw blades, steel tubes and motor ...