Top beam welding system

The utility model discloses a top beam welding system, which is characterized in that a driving seat and a driven seat are fixedly arranged on a base of a clamping and shifting device, the driving seat and the driven seat are oppositely arranged, a welding platform is rotatably arranged between the driving seat and the driven seat, and two U-shaped plates which are oppositely arranged are arrangedon the welding platform. Two oppositely-arranged sliding rails are arranged on a base of the sliding rail device, a drag chain is arranged between the two sliding rails, and a robot support moving along the sliding rails is arranged on the drag chain in a penetrating mode. During use, the two robots used for welding move along the corresponding sliding rail devices to weld the top beam arranged on the welding platform, and the push rod is turned over through rotation of the welding platform, so that the robots can weld the bottom plate, the panel, the side plates and the internal reinforcingribs more conveniently. Do