... , 3-phase) MCU for welding process, Model: AT89C52(ATMEL, USA)Welding power supplyDC 290 – 330VCompressed air≥ 0.4 – 0.8MpaWelding current1000 – 2000A(secondary side ... , 3-phase) MCU for welding process, Model: AT89C52(ATMEL, USA)Welding power supplyDC 290 – 330VCompressed air≥ 0.4 – 0.8MpaWelding current1000 – 2000A(secondary side ...