... , 3-phase (others available uponrequest, like: 220V, 60Hz, 3-phase) MCU for welding process, Model: AT89C52(ATMEL, USA)Welding power supplyDC ... , 3-phase (others available uponrequest, like: 220V,60Hz, 3-phase) MCU for welding process, Model: AT89C52(ATMEL, USA)Welding power supplyDC ...