Abstract: S43932 stainless steel cold rolled plate with a thickness of 1.0 mm is welded with heat input of 88 、101、 132 and 188 J/mm by tungsten inert gas welding,and the micro-morphologies and phase constitutes of the weld zone are investigated.By the systematic analysis of the tensile properties of welded specimens when perpendicular to and parallel to weld seam,and with notch weld seam and the weld seam Erichsen cupping test results,it is found that when the heat input   is 101 J/mm,the welded joint has optimum matching of tensile and forming performance.However, when the heat input larger than 101 J/mm,the tensile strength and Erichsen cupping value of the welded joint decreases drastically. The formation of small grains and the precipitation of Ti-riched(Nb,Ti)(C,N)phase in the weld zone lead to good mechanical properties of the welded joint.