... head moves horizontally and up and down on the gantry, and makes the tip to align the weld, ... of the machine, other parts are mounted on the gantry (except for the power source of the welding machine), ... running sliding seats are under it, and drive the gantry moving on the tracks by step-by-step motor ... control box is mounted on the side of the gantry and the operation boxes are mounted on the two ...