Measurement of Residual Stress Distribution and Fatigue Life Assessment of Similar and Dissimilar Butt-Welded Joint

摘要

The residual stresses developed during welding are deleterious to fatigue life. Tensile stresses tend to pull apart the surface of the material. Cracks are developed when subjected to high tensile stress. By altering the residual stress level, fatigue life can be improved significantly. The intent of this work is to measure the residual stress distribution and fatigue life assessment of butt-welded joint with similar (M.S IS 2062) and dissimilar (SS304L & M.S IS 2062) materials. The residual stress level in these joints is evaluated accurately by X-ray diffraction, before and after the surface modification. Shot peening is the surface modification method employed to enhance fatigue life of the joint. Based on the experimental results, it is observed that fatigue life of the welded joint has been improved.