Abstract
In this research, additional welding with low temperature transformation welding material and improvement method which combined cleaning treatment with a grinder and hammer peening treatment have been investigated. The improvement effect is clarified from the fatigue test of girder specimen with the out-of-plane gusset plate. Although the improvement effect by peening treatment varied, the fatigue strength at weld toe of out-of-plane welded joint increased to more than D class. The improvement effect by the additional welding decreases since the compressive residual stress on the front side is lost due to the additional welding on rear side. When using maximum principal stress range for structural hot spot stress range, the effects of shear stress and the difference of stress concentration on fatigue strength improvement can be considered.
