Oval tube welding tool

The utility model relates to an elliptical tube welding tool, which is characterized in that the lower end face of an elliptical base is provided with elliptical upright posts with the same shape and smaller sections, the top of the elliptical base is symmetrically provided with base bosses with elliptical outlines, the two base bosses are positioned at two ends of an elliptical long shaft and are provided with opposite arc concave surfaces, and a chain wheel is mounted between the two arc concave surfaces; the peripheries of the two base bosses are wrapped with chains, the front side and the rear side of the chain wheel are meshed with the chains, a top cover is fixed to the tops of the two base bosses, a center hole of the chain wheel is fixed to the lower portion of a driving shaft, the lower end of the driving shaft is inserted into a center counter bore of the base, and the upper end of the driving shaft penetrates through the top cover to be connected with the output end of a motor driving mechanism. Th