This series of welding machine is manufactured with the advanced technology imported from Japan. Lts main circuit is of double reversed star-connected SCR(Silicon Controlled Rectifier)rectifying circuits; Its control circuits adopts high precision control technique. Unified adjustment can also be made when the network voltage and surrounding environment is under variation. This series of welding machine has good welding performances; Its arc is steady and gentle, with little spatter, high reliability. Lt can be fully compared with the inverter type welding machines. This machine also has the slowly wire-feeding function and small ball-removing function, make the arc-striking to be very easy. Connections between the wire feeding machine and the main machine only carried out by one control cable, both safe and convenient.