... to heating, tempering, quenching and annealing before forging and stamping... This series of high frequency induction heating equipment ... thermal treatment of metal component surface like quenching, annealing, tempering, drill bit welding, saw blade welding, motor rotor ... 4503-phase380V25 KVA301-1.50.21000×800×1800Quenching, annealing, tempering, diathermy, metal smelting, welding of drill bits, saw ...