Plasma arc welding (PAW) is a high-precision welding technology that uses ionized plasma as the heat source. It works by compressing the arc through a constricting nozzle, which increases the energy density of the plasma jet, enabling it to melt and join metals efficiently. Compared with traditional welding methods, PAW has the advantages of stable arc, precise temperature control, and narrow heat-affected zone, which can effectively reduce welding deformation and improve the quality of weld seams.

This technology is widely used in welding high-quality metals and precision components, such as stainless steel, titanium alloy, and aluminum alloy. It is especially suitable for welding thin plates, small parts, and difficult-to-weld materials in aerospace, automotive manufacturing, and precision instrument industries, becoming an important application of artificial low-temperature plasma in industry.