Fatigue strength improvement effect of welded joints peened by ICR treatment using a chargeable electric device

Abstract

This study aims to investigate the fatigue strength improvement effect of welded joints peened by ICR treatment using a chargeable electric device. First, flat plates were peened in different positions, residual stresses around the peened flat plates were measured and workability and efficiency of the ICR treatment using the chargeable electric device was discussed from the point of the finished surfaces view, and then a suitable treatment condition was determined. Finally, plate bending fatigue tests of out-of-plane gusset welded joints under stress ratio of R=-1 were performed and fatigue cracks developed in different lengths were ICR-treated using the device based on the determined treatment condition to investigate the fatigue strength improvement effect.