used for the autuomatic welding of jointing, vertical and horimntal welding touch has wavering function. Waving speed, angle, central shifting and left/right pause time can be adjusted so as to make the best welding resuh.the driven is equipped with manual dutch for easy position and returning to the starting position of the welding.Small rail is easy to move and equipped with permanent magnet, easy to operate. Widely use in shipbuilding ,bridge ,vehicle oil&chemical and steel structure engineering.Note: 1.8meter Rail 1 Set per standard