Residual Stress Distribution in Butt Flat Welded Joint of High Strength Steel

Qianqian Jia, Gong Chen

Modern ships and offshore engineering structures are usually welded by a large number of high-strength steel, and flat plate butt welding joint is the most common joint form in ship structures. These welded joints inevitably produce welding residual stress during welding process and have an impact on the fatigue strength of the whole structure, while high strength steel is more sensitive to welding residual stress. At the same time, due to long-term alternating loads caused by waves, waves and currents during service, the weld zone is prone to cracks, which will lead to fatigue fracture of the structure. In this paper, based on the theory of thermo-elastic-plastic and fracture mechanics, the residual stresses of welded joints of high strength steel plate are studied by programming with APDL language in ANSYS, and the distributions of residual stresses in different paths are obtained. The results show that the peak value of transverse residual tensile stress appears near the weld toe, while the stress far from the weld is relatively small. The research results in this paper can lay a foundation for the fatigue life study of ship welded structures.

https://dx.doi.org/10.31873/IJEAS.6.6.2019.15