Butt Joint Plane Welding Machine It use for automatic plate joint welding. Moveable gantry structure, and has the merits of simple operation, high efficiency and reliable. plate thickness: 6mm-35mm(20mm no need beveling) plate width (seam length ): 8mm ( at customers choice ) welding technology : double wire submerged arc welding by both sides current polarity: AC+DC (with original import 1500A,100%AC and DC welder ) welding speed: 150mm-1500mm