The residual stress of the welding joint of S355J2W+N steel was studied in this paper

and the residual stress distribution of weld seam was analyzed. The results show that the longitudinal stress and maximum principal stress of the weld area are mainly tensile stress

which decreases the trend from the center to the edge. The lateral stress of weld area is dominated by compressive stress

and the maximum value（absolute value）appears at the edge of the specimen. The residual stress is compressive stress

and the maximum value（absolute value）appears in the intermediate region of the weld and the edge of the plate. The residual stress difference between the repaired and unrepaired joints was not significant

without obvious regularity. Through the experiment

combined with the existing research conclusion

for the stress after welding butt joint structure with the annealing treatment

residual stress has little effect on mechanical properties of welded joint.