To comprehensively promote the application of automatic welding in the construction of small and medium-sized long-distance pipelines,an application plan of using tungsten argon arc auto-matic root welding + external welding machine automatic welding test section is proposed through re-search and comparison of automatic welding methods.This solution is a welding process that uses auto-matic tungsten argon arc welding technology to achieve root welding double-sided forming with single-sided welding,and gas shielded downward welding with a single melting electrode welding wire to fill the cover surface.This welding process has a wide range of parameters,is suitable for various terrains,fully utilizes the advantages of strong wind resistance,reliable penetration,and few defects of argon arc welding,reduces human interference,and achieves high-quality automated fully automatic welding.The research results of the welding process evaluation indicate that this welding method meets the re-quirements of national standards and DEC documents,providing technical reserves and support for the application of automatic welding of small and medium-sized pipelines.At the same time,this welding method also points out the direction for improving the welding quality of small and medium diameter high-pressure pipelines such as gas gathering pipelines and carbon dioxide transmission pipelines,and has good application prospects.
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