A Study of Predicting 3-dimensional Welding Residual Stresses Distribution for T-joint Fillet Specimen

Abstract Fillet welding accounts for about 80% of all constructing process of ship and ocean structure. T-joint is one of the typical shapes which are frequently reported to experience the fatigue damage when the marine structure meets the storm loads. The fatigue damage is affected by the magnitude of residual stresses on the weld. Recently, many shipping registers and design guidances have required that the fatigue strength assessment method should be compensated by the effect of the residual stress in case that the random loading or storm loading is applied to the marine vessels. This study suggests the computational procedure to analyze the residual stresses of T-joint specimen that is frequently reported to get damaged by the storm loading. Experiment by XRD as well as the 3-D computational welding model is presented in order to get the profile of residual stress. Throughout the comparison of experimental result with the computationalresult, the computational model was validated. Thereafter, characteristics of the residual stresses in the joint are discussed.. Key Words : Welding, Residual stress, Fatigue damage, FEA, XRD, T-joint, Extreme storm load