High speed motor train unit roof assembly-welding device

The invention discloses an assembly welding device for high-speed bullet train tops and belongs to the technical field of railway vehicle body manufacturing. The assembly welding device comprises two foundational beams which are arranged parallelly and a plurality of fixed plates arranged on the foundational beams, wherein the foundational beams are formed by a plurality of sections which have horizontal H-shaped cross sections and are connected by connecting pieces at two ends serially into a whole, and the bottom surfaces of the foundational beams are fixedly connected with two connecting plates pre-buried in a foundation; the fixed plates are provided with central positioning racks, top positioning racks, a plurality of flat-top supporting racks, round-top supporting racks and a plurality of pairs of clamping racks. Through full investigation and research and absorption of advantages of rail passenger train manufacturing technology at home and abroad, the welding device makes a structural break through and innovation in the prior mode, realizes the manufacturing of all of the five kinds of train tops of high-speed bullet trains, uses the cooperation of one set of tool and a welding mechanical arm and realizes the welding of the insides and the outsides of the train tops. In addition, the device reduces the area for welding operation, improves the utilization rate of plant space, saves capital, ensures welding quality, greatly improves working efficiency and reduces the labor intensity of operators.