| Citation: | WANG Chiquan, SHI Liang, ZHANG Xiangchun, et al. Influence of welding defects on fatigue behavior of dissimilar aluminum alloy TIG butt joint[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(7): 1505-1514. doi: 10.13700/j.bh.1001-5965.2020.0370(in Chinese)
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Fatigue tests and fracture morphology analyses were performed to determine the influence law and mechanism of pore defect and incomplete fusion defect on the fatigue performance of 5A06-O/7A05-T6 dissimilar aluminum alloy TIG butt joint. The results show that both pore defect and incomplete fusion defect have adverse effects on the fatigue properties of 5A06-O/7A05-T6 butt joint, and the interaction between the size and location of defects and the load is the main factor affecting the early initiation of fatigue cracks. Fatigue cracks are more likely to initiate at the welding defects with larger size and closer to the material surface under the same stress level, and the interaction between welding defects and fatigue loading increases with the decrease of stress level, and ultimately decreases the fatigue strength. Compared with pore defect, the effect of stress concentration at the edge of incomplete fusion defect is more significant, which is more likely to cause fatigue crack initiation, the microstructure of welded joint is more brittle than that of welding base metal, and the fatigue crack propagates alternately in the transgranular and intergranular form, which further shortens the fatigue life.
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