| Citation: | YANG Kunyu, PENG Bin, YUAN Zhaoqiao, et al. Influence of ultrasonic energy on weld formation of friction stir welding of aluminum alloy[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(8): 1437-1443. doi: 10.13700/j.bh.1001-5965.2019.0485(in Chinese)
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In order to find out the influence mechanism of ultrasonic energy on the weld formation and weld defects of aluminum alloy Friction Stir Welding (FSW), the combined method of numerical simulation and experimental verification was used to design the comparison of the flow field simulation and test between Ultrasonic Assisted Friction Stir Welding (UAFSW) and friction stir welding under the same process conditions. The flow vector and metallographic structure of the thermoplastic metal on the cross section of the two types of weld are analyzed to find out the flow changes of the weld metal after ultrasonic introduction. The analysis results show that the introduction of ultrasonic energy makes the horizontal flow pattern of the metal in the friction stir welding of aluminum alloy evolve into a sloping flow mode, the two upper and lower independent flow fields are unified, and the lowest flow rate of the weld metal has up to one order of magnitude improvement. The integrity of weld formation is significantly enhanced, and the weld defect rate is greatly reduced.
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