90KVA metal hot forging power supply, IGBT design, used for metal hot forging power supply, induction forging, heat treatment. 90KW metal hot ... , over voltage, water failure, phase failure and unfit lad and so on, machine can be protected from ... .3, metal quenching, annealing, quenching, tempering and heat treatment.4, metal forging, hot forming.5, powder metallurgy sintering, and metal smelting. ...