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Research Article

Impact of travel speed on the microstructure and mechanical properties of adjustable-gap bobbin-tool friction stir welded Al-Mg joints

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  • Received: 27 May 2020Revised: 5 July 2020Accepted: 7 July 2020Available online: 9 July 2020
  • In this study, the butt welds of 4 mm thick 5A06 aluminum alloy plates were produced by the developed adjustable-gap bobbin tool friction stir welding at three welding speeds of 200, 300, 400 mm/min. The microstructure was studied by using an optical microscope and electron backscatter diffraction (EBSD). Tensile tests and microhardness measurements were performed to identify the effect of welding speed on the joint mechanical properties. It is revealed that sound joints could be produced at a welding speed of 200 mm/min while voids are present at different positions of the joints as the welding speed increases. The EBSD result shows that the grain size, high angle grain boundaries (HAGBs) and density of geometrically-necessary dislocations (GNDs) in different regions of the joint vary depending on the recovery and recrystallization behavior. Specific attention was given to the relationship between the local microstructure and mechanical properties. Microhardness measurements show that the average hardness of the SZ is higher than that of the base material, which is almost not affected by the welding speed. The tensile strength of the joint decrease with increasing the welding speed, and the maximal strength efficiency reaches 99%.
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    [7] Semih Mahmut Aktarer, Dursun Murat Sekban, Tevfik Kucukomeroglu, and  Gencaga Purcek, Microstructure, mechanical properties and formability of friction stir welded dissimilar materials of IF-steel and 6061 Al alloy, Int. J. Miner. Metall. Mater., https://doi.org/10.1007/s12613-019-1783-z
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Impact of travel speed on the microstructure and mechanical properties of adjustable-gap bobbin-tool friction stir welded Al-Mg joints

  • Corresponding author:

    Wen-ya Li    E-mail: liwy@nwpu.edu.cn

  • 1. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Travel Technologies, Northwestern Polytechnical University, Xi'an 710072, China
  • 2. Capital Aerospace Machinery Company, Beijing 100076, China
  • 3. Department of Mechanical Engineering, Hellenic Mediterranean University, Heraklion, Crete 71004, Greece

Abstract: In this study, the butt welds of 4 mm thick 5A06 aluminum alloy plates were produced by the developed adjustable-gap bobbin tool friction stir welding at three welding speeds of 200, 300, 400 mm/min. The microstructure was studied by using an optical microscope and electron backscatter diffraction (EBSD). Tensile tests and microhardness measurements were performed to identify the effect of welding speed on the joint mechanical properties. It is revealed that sound joints could be produced at a welding speed of 200 mm/min while voids are present at different positions of the joints as the welding speed increases. The EBSD result shows that the grain size, high angle grain boundaries (HAGBs) and density of geometrically-necessary dislocations (GNDs) in different regions of the joint vary depending on the recovery and recrystallization behavior. Specific attention was given to the relationship between the local microstructure and mechanical properties. Microhardness measurements show that the average hardness of the SZ is higher than that of the base material, which is almost not affected by the welding speed. The tensile strength of the joint decrease with increasing the welding speed, and the maximal strength efficiency reaches 99%.

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