Special welding machine for locomotive traction bar

The invention discloses a special welding machine for a locomotive traction bar. The special welding machine comprises a guide base, a driven wheel supporting rack, a driving wheel supporting rack and a driving device, wherein the driven wheel supporting rack and the driving wheel supporting rack can slide on the guide base in the longitudinal direction. A welding gun oscillator is arranged on the side edge of the driven wheel supporting rack and the side edge of the driving wheel supporting rack respectively, and a welding gun height adjusting device provided with a clamping welding gun is arranged on the top of each welding gun oscillator. The driving wheel rotation motion of the driving wheel supporting rack, the longitudinal oscillation motion of the welding gun oscillators along the guide base, and the height adjusting motion of the welding gun height adjusting devices are controlled by the driving device. The special welding machine has the advantages that the driving wheel driving device is used for carrying out automatic control over rotation of the traction bar to be welded, welding of three welding lines can be finished at a time, the positions to be welded at the two ends of the traction bar can be welded at the same time, and therefore the time needed for welding is greatly shortened, the efficiency is high, and the accuracy is high.