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This automatic girth welder is suitable for pipe-to-pipe, pipe-to-elbow, pipe tee, pipe high-neck butt joint, pipe flange, elbow flange angle joint. The forced circulation water cooling system ensures the long-term reliable operation of the whole machine. The one-button operation automatically completes the entire welding process, and the welding parameters can also be intervened in real time as needed. In addition, this automatic girth welder can directly call the corresponding welding process according to the weldment specifications and number.