Argon filling protection tool for welding large-diameter high-alloy pipeline

The utility model belongs to the technical field of large-diameter pipeline welding tools, and particularly relates to an argon filling protection tool for welding a large-diameter high-alloy pipeline, which is characterized by comprising a protection cover with a sealed rear end and an open front end, the rear end of the protection cover is fixedly connected with a gas connecting pipe, and the gas connecting pipe is communicated with an inner cavity of the protection cover. A handle is fixedly installed on the side wall of the protective cover, and the front end of the handle extends forwards out of the protective cover. During use, the protective cover is placed between two pipelines to be welded, the handle is located on the outer side of the pipelines, the protective cover is driven by the handle to move along with a welding gun at any time, it can be guaranteed that the back face of a welding seam is always protected by high-concentration argon, the argon consumption is saved while the welding quality is