P+T welding system is an advanced composite automatic welding technology that combines Plasma Arc Welding (PAW) and Tungsten Inert Gas Welding (TIG). It adopts the process of "plasma root welding + TIG filling and capping", which realizes high-efficiency, high-quality and one-side welding with back formation. It is widely used in pressure vessels, pipelines, stainless steel cylinders, new energy equipment and other fields.