Bolt welding fixture

The utility model discloses a bolt welding fixture, which comprises a rectangular floating plate and a bolt welding bottom plate, wherein the bolt welding bottom plate is fixed on the rectangular floating plate by an internal thread cylindrical pin; the edge of the floating plate is provided with a plurality of linear bearings; the center of the floating plate is provided with a rectangular opening; and a locating ring is fixed on the floating plate by the internal thread cylindrical pin and is provided with a locating column. When the bolt welding fixture is used for machining, a part to be welded is put on the locating ring and is fixed by the locating column; then, the floating plate is lifted to be regulated to the optimum position; and the outer surface of the part to be welded or the inner surface of the part to be welded is welded by a square opening, and finally, the welding procedure of the bolt is finished. The fixture can realizes semi-automatic welding instead of manual welding, and has the advantages of high machining efficiency and good welding quality.