2205 duplex stainless steel is welded with the different welding technologies, and the influences of different welding technologies on the mechanical properties, microstructure, and corrosion resistance of welding joint are analyzed. The results show that:when the grain does not grow significantly, the impact toughness of weld and heat-affected zone increases with the increase of austenite mass fraction; when the Gas Metal Arc Welding (GMAW) is used, adding N2 into the protective gas can effectively increase the austenite mass fraction in all areas of welding joint, so as to improve the mechanical properties and corrosion resistance of welding joint; the corrosion rate of base material and weld of 2205 duplex stainless steel increases obviously with the increase of corrosion liquid mass fraction. It is of great significance for the manufacture, promotion and use of components and products of 2205 duplex stainless steel to optimize its welding technology parameters and to ensure its welding joint a good comprehensive performance.