... before forging and stamping... This series of high frequency induction heating equipment consists of self-excited electronic tube oscillators ... applied during the process of thermal treatment, specifically in the field of thermal treatment of metal component surface like ... phase380V25 KVA301-1.50.21000×800×1800Quenching, annealing, tempering, diathermy, metal smelting, welding of drill bits, saw blades, ...