Automatic welding device used for circumferential weld seam

The invention discloses an automatic welding device used for a circumferential weld seam. The device is composed of a walking track plate arranged on a welding winding drum and a welding tractor arranged on a walking track; the walking track plate is composed of three flexible tracks; according to the welding tractor, a guide wheel placed on one flexible track is installed on the front portion of a tractor body, an outlet of a feeding pipe is matched with a welding gun below a machine frame, and a wire reel is matched with a wire feeding mechanism on the machine frame and is in shaft connection with an output shaft of a wire welding motor; the wire welding motor, a motor and a power source are electrically connected with a control box. According to the automatic welding device used for the circumferential weld seam, the problem that a large-scale winding drum structure is difficult to weld can be solved, and common union melt welding can be applied to the circumferential combined weld seam.