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Welding is widely used for construction of many structures. There exists residual stress near the bead because of locally given heat. Tensile residual stress on the surface reduces the fatigue strength. Some methods of reducing residual stress have been presented. In this paper, a new method is proposed in which vibrational load is applied during the welding operation. The advantage of this method is that vibrational load is generated by a small shaker. This method is expected to be practical. By a simple experiment, it is clarified that tensile stress near the bead can be reduced by this method. Next, experimental results are examined by an analytical method. It is assumed that reduction of residual stress is caused by local plastic deformation because initial residual stress is high and nearly equal to yielding stress. Using an analytical model with a preloaded spring having elasto-plastic characteristics, reduction of residual stress is evaluated qualitatively.

Reduction of Residual Stress of Welded Joint Using Vibration.