Pipe series tooling is mainly used for pipe-pipe, pipe-flange, pipe-elbow, pipe-tee and other forms of pipe welding. The open-type pipe wrench with patented technology is used to realize automatic centering of pipes and pipe fittings, Electric (manual) clamping, and stable rotation, equipped with control means such as arc pressure monitoring, to realize automatic welding of prefabricated bottoming, filling and covering of pipelines.