To provide a welded joint which has improved fatigue strength by introducing compressive residual stress without giving deformation causing another stress concentrating part to a welding part, and is suitable for applying a steel structure such as a steel bridge in which superior fatigue characteristics is required.
In a peening method performed to a welded joint, impact dents are continuously formed along a welding bead on the surface of a steel material of a weld toe by a vibrating terminal. The vibrating terminal is an almost rectangular shaped body whose top of tip end part has an arc shape, and the tip end part has a length of 1-10 mm in the direction of movement, and the top has, in a cross section rectangular to movement direction, a center of curvature decentered from the center of width of the vibrating terminal to the weld toe side, and has an arc shape having a curvature radius of 1-5 mm, and in the welded joint, the impact dents whose maximum depth is not less than 0.03 mm and less than 0.50 mm are formed in a region of 5 mm from the weld toe to a base material side.
IKI SATOSHI
TOMO HAJIME
JFE ENG CORP
| JP2012011462A | 2012-01-19 | |||
| JP2010029897A | 2010-02-12 | |||
| JPH06106243A | 1994-04-19 | |||
| JP2006320960A | 2006-11-30 | |||
| JP2013233589A | 2013-11-21 |
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