Effect of welding residual stress on fatigue behavior of welded structures treated by high-frequency mechanical impact
The influence of residual stress on the fatigue properties of the welded joint is studied by treating the longitudinal corner joint of Q355 steel with a high-frequency mechanical impact(HFMI)device.The results show that HFMI treatment can significantly improve the fatigue life of welded joints and that a combined treatment of stress relief and HFMI can considerably improve their fatigue properties.In terms of the characteristic fatigue strength(FAT)of as-welded joints,in comparison,the FAT of joints directly treated with HFMI under the condition of welding residual stress increased by 143.9%,while FAT of joints with a combined treatment increased by 210.3%.While fatigue crack of as-welded and HFMI joints initially occurred at the weld toes,the location changed to the base material for welded joints treated with combined treatment.
万方数据
维普
