Microstructure and mechanical property differences between friction stir lap welded joints using rotating and stationary shoulders
Microstructure and mechanical property differences between friction stir lap welded joints using rotating and stationary shoulders
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DOI：
10.1007/s00170-016-9640-y
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
S. Ji;Zhengwei Li;Zhenlu Zhou;Liguo Zhang
中科院分区：
文献类型：
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作者：
S. Ji;Zhengwei Li;Zhenlu Zhou;Liguo Zhang
本研究比较了2024-T4铝合金搅拌摩擦搭接（FSLW）过程中传统旋转焊肩和静止焊肩的性能。重点讨论了不同肩部搭接接头的形成、变形、显微组织和力学性能。结果表明，由于固定肩的密封阻隔作用和刮擦作用，可以获得光滑的无肩痕和闪光的接头表面。采用固定肩可以获得较小的变形关节，这是由于较低的热输入造成的。采用固定肩可以大幅度降低搭接和冷搭接，从而获得较好的搭接剪切性能。搭剪试验中，当上板后退侧承担主荷载时，采用静肩节点的搭剪破坏荷载比传统节点高50%左右。此外，虽然采用不同的结构形式，但采用固定肩的节点具有相当均匀的搭剪破坏荷载。
In this study, the performances of traditional rotating shoulder and stationary shoulder were compared during friction stir lap welding (FSLW) of 2024-T4 aluminum alloy. Formations, distortions, microstructure, and mechanical properties of the lap joints using different shoulders were mainly discussed. Results showed that smooth joint surface without shoulder marks and flash can be obtained due to the sealed barrier effect and scraping effect of the stationary shoulder. Joint with smaller distortion, which resulted from lower heat input, can be obtained using the stationary shoulder. Hook and cold lap can be largely depressed using the stationary shoulder, and therefore better lap shear properties can be obtained. When the retreating side of the upper sheet bore the main load during the lap shear test, joints using stationary shoulder owned about 50 % higher lap shear failure loads than the traditional joints. Moreover, although using different configurations, joints using the stationary shoulder owned rather uniform lap shear failure loads.