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<p>In this work, refill friction stir spot welding (RFSSW) was used to join dissimilar 6063/2060 Al alloys for skin-stringer applications. The effect of tool plunging speed on the microstructure and mechanical properties of the joints was studied. Results show that all the hooks in the joints show flat morphologies, but they are still the failure crack initiation points of the joints. A large plunging speed of 115&#xa0;mm/min causes incomplete refilling in the joint. Compared with the 6063 Al alloy, the 2060 Al alloy has coarser grains in the base material but finer grains in the stir zone. The stir zone has higher hardness when using higher plunging speed due to slight softness. Increasing the plunging speed slightly decreased the joint lap shear failure load. The maximum failure load of 8.53&#xa0;kN is obtained when the tool plunging speed of 40&#xa0;mm/min is used.</p>

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Refill Friction Stir Spot Welding 6063/2060 Al Alloys: Effect of Tool Plunging Speed on Microstructure and Properties of the Welded Joints

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Xuesong Liu,
  • Zhengwei Li

摘要

In this work, refill friction stir spot welding (RFSSW) was used to join dissimilar 6063/2060 Al alloys for skin-stringer applications. The effect of tool plunging speed on the microstructure and mechanical properties of the joints was studied. Results show that all the hooks in the joints show flat morphologies, but they are still the failure crack initiation points of the joints. A large plunging speed of 115 mm/min causes incomplete refilling in the joint. Compared with the 6063 Al alloy, the 2060 Al alloy has coarser grains in the base material but finer grains in the stir zone. The stir zone has higher hardness when using higher plunging speed due to slight softness. Increasing the plunging speed slightly decreased the joint lap shear failure load. The maximum failure load of 8.53 kN is obtained when the tool plunging speed of 40 mm/min is used.