Method of peening treatment of lap fillet weld joint and welded structure

摘要

The radius of curvature of the vertical cross section in the direction perpendicular to the welding direction of the tip of the striking pin 5 is 0.05 to 0.50 mm and not more than the radius of curvature of the welding toe 4. As a series of strikes, continuously applying in the direction inclined from the welding direction, and repeating the series of strikes in the welding direction, wherein an strike comprising a plurality of strike marks 10 formed by the series of strikes The marks 12 overlap each other with at least a part of the adjacent hitting marks 12, while the end of the hitting marks 12 in the direction perpendicular to the welding direction is perpendicular to the welding direction of the adjacent marks 12. A peening treatment method capable of sufficiently improving the fatigue characteristics of a lap fillet welded joint having a thin steel plate as a base material by providing a separation from the end of the direction is provided.