Frame flange welding tool

The utility model discloses a frame flange welding tool, which belongs to the technical field of flange processing and comprises a frame, reinforcing plates are fixedly mounted on the periphery of the bottom end of the frame, supporting legs are fixedly connected to the bottoms of the reinforcing plates, pressure dividing plates are fixedly connected to the bottoms of the supporting legs, and a fixing seat is fixedly mounted on the left side of the upper end of the frame. A limiting base is fixedly installed in the middle of the top end of the rack, a motor is fixedly installed on the right side of the top of the rack, the output end of the motor is rotationally connected with a rotating shaft, the left end of the rotating shaft is fixedly connected with a three-jaw chuck, a round pipe is fixedly installed at the left end of the three-jaw chuck, and a pressing assembly is arranged on the outer wall of the round pipe. The left end of the round pipe is fixedly connected with a flange plate, and a positioning ho