Automatic welding device for flexible railway vehicle roof

The utility model relates to the field of railway vehicle roof manufacturing, in particular to an automatic welding device for a flexible railway vehicle roof, which comprises a pair of longitudinal beams and a plurality of shaping mechanisms connected to the longitudinal beams in a sliding manner, the shaping mechanism comprises a supporting shaft with rotational freedom and a plurality of supporting plates detachably connected to the circumferential direction of the supporting shaft. When the car roof automatic welding device is used for automatic welding of a car roof, the supporting plates in the multiple shaping mechanisms serve as a car roof welding supporting foundation on one hand and serve as a car roof forming die on the other hand, and therefore it is guaranteed that the radian of the section of the car roof formed through welding can meet the design requirement. When different car roofs need to be welded, the corresponding supporting plates in the multiple shaping mechanisms can be rotated at the