Vertical welding tool for circular pipe fitting

The utility model belongs to the field of welding auxiliary equipment, and particularly discloses a vertical welding tool for a circular pipe fitting, which comprises a base, a screw rod is vertically mounted at one end of the base, a lifting sleeve and a thread bushing are sleeved on the screw rod, the lifting sleeve is in sliding connection with the screw rod, and the thread bushing is in threaded connection with the screw rod. The lifting sleeve is rotationally connected with the threaded sleeve through the reducing sleeve; a cross beam of a cylindrical structure is vertically fixed to one side of the lifting sleeve, and two supporting plates of a V-shaped structure are installed on the top face of the cross beam at intervals. The tool is reasonable in design, compact in structure and light and handy in appearance, meets the tailor-welding technical requirements of circular pipe fittings with different diameters by means of ordered combination of the cross beam and the V-shaped supporting plate, is high in