The machine is made with a simple and compact structure, which including walking trolley, welding torch and wire feedes. Additionally ,the total weight of this machine is about 30KG(without welding wire).The machine has a strong power and walking speed is stable. Especially, the machines has a system to monitoring and adjust speed so that the machine works with a constant speed. Additionally, the machine also heve a quick-run model which allows the machine to back to the starting-welding position quickly. The machine has a swinging function, and there has a various welding modes can be chosen to achieve the best welding performance. Wavering speed, angle, off-centering position, and left and right stay time can be adjusted, Additionally, all parameters are displayed by digital tube. The machine is widely used for ship, bridge, engine, petrochemical and steel structure works, ect,