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 has flexible rails, is suit for welding of pipe with large diameter,The machine uses a brushless-motor-driven to ensure the machine move steadily and high-quality welding performance.