Welding device for special-shaped steel pipe arch

The utility model provides a special-shaped steel pipe arch welding device which comprises a supporting vehicle, a lifting supporting table is arranged on the supporting vehicle, a first limiting plate and a second limiting plate which slide are arranged at the two ends of the supporting table respectively, a gear is arranged on the supporting table, the first limiting plate comprises a rack, the second limiting plate comprises a second rack, and the second rack and the rack are both meshed with the gear. And through measurement of the total station, the axis of the special-shaped steel arch is corrected in real time by driving the rocker, moving the supporting vehicle or driving the multiple hydraulic jacks again, and therefore the assembling and welding precision of the special-shaped steel arch is guaranteed. The device solves the problems that in the welding process of the special-shaped steel arch, arch center line deviation is caused, the position of a joint is staggered and irsmooth, linear distortion