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6061-T6铝合金的静止轴肩搅拌摩擦焊工艺及组织性能

申浩, 杨新岐, 李冬晓, 崔雷

申浩, 杨新岐, 李冬晓, 崔雷. 6061-T6铝合金的静止轴肩搅拌摩擦焊工艺及组织性能[J]. 焊接学报, 2016, 37(5): 119-123.
引用本文: 申浩, 杨新岐, 李冬晓, 崔雷. 6061-T6铝合金的静止轴肩搅拌摩擦焊工艺及组织性能[J]. 焊接学报, 2016, 37(5): 119-123.
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SHEN Hao, YANG Xinqi, LI Dongxiao, CUI Lei. Microstructures and mechanical properties of 6061-T6 aluminum alloy welded by stationary shoulder friction stir welding process[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(5): 119-123.
Citation: SHEN Hao, YANG Xinqi, LI Dongxiao, CUI Lei. Microstructures and mechanical properties of 6061-T6 aluminum alloy welded by stationary shoulder friction stir welding process[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2016, 37(5): 119-123.
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6061-T6铝合金的静止轴肩搅拌摩擦焊工艺及组织性能

  • 天津大学天津市现代连接技术重点实验室, 天津 300072

Microstructures and mechanical properties of 6061-T6 aluminum alloy welded by stationary shoulder friction stir welding process

  • Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China

摘要

    摘要
  • 摘要: 采用自主研制的静止轴肩搅拌摩擦焊工具系统成功获得了6061-T6铝合金的对接接头. 对该接头的焊缝成形、显微组织、硬度分布以及拉伸性能分别进行了试验研究. 结果表明,SSFSW工艺所得6061-T6铝合金接头具有非常美观的焊缝成形,与常规的FSW工艺相比,几乎没有出现焊缝减薄的现象;焊缝组织分区也有明显的不同,TMAZ非常窄,只有几百微米;接头的硬度呈"W"形分布;在转速1 000 r/min,焊速为200 mm/min时,接头的抗拉强度和断后伸长率达到最大,分别为母材的71.5%和44.6%;拉伸试样均断裂在热影响区,它是接头发生断裂的最薄弱区域.
    Abstract: 6061-T6 aluminum alloy butt joints were successfully obtained by stationary shoulder friction stir welding SSFSW process using the self-developed tool system. Welding surfaces, microstructures, hardness profiles and tensile properties of the obtained joints were measured and studied, respectively. The results show that the obtained joints by SSFSW process had nice-looking appearances and smooth surfaces. Compared with conventional FSW, the phenomenon of the weld thickness reduction was almost eliminated. The microstructures of SSFSW joints were also significantly different. The thermomechanically affected zone was quite narrow, whose width was only a few hundred micrometers. The hardness profiles of obtained joints presented "W" shape. At the tool rotation speed of 1 000 rpm and the welding speed of 200mm/min, both the tensile strength and the elongation reached the maximum, which were up to 71.5% and 44.6% of the base material, respectively. All the joints were fractured at the heat affected zone, which was the weakest region.
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    • 参考文献(8)
  • [1] Martin J P, Stanhope C, Gascoyne S. Novel techniques for corner joints using friction stir welding[C]. Friction Stir welding and Processing VI. The TMS 2011 Annual Meeting and Exhibition. San Diego, California, USA. A John Wiley and sons lnc Publication. 2011: 179-188.
    [2] 刘会杰, 李金全, 段卫军. 静止轴肩搅拌摩擦焊的研究进展[J]. 焊接学报, 2012, 33(5): 108-112. Liu Huijie, Li Jinquan, Duan Weijun. Progress in the stationary shoulder friction stir welding[J]. Transactions of the China Welding Institution, 2012, 33(5): 108-112.
    [3] Davies P S, Wynne B P, Rainforth W M, et al. Development of microstructure and crystallographic texture during stationary shoulder friction stir welding of Ti-6Al-4V[J]. Metallurgical and Materials Transactions A, 2011, 42(8): 2278-2289.
    [4] Ahmed M M Z, Wynne B P, Rainforth W M, et al. Through-thickness crystallographic texture of stationary shoulder friction stir welded aluminium[J]. Scripta Materialia, 2011, 64(1): 45-48.
    [5] Widener C A, Talia J E, Tweedy B M, et al. High-rotational speed friction stir welding with a fixed shoulder[C]// Proceedings of the 6th International Symposium on Friction Stir Welding, Montreal. 2006.
    [6] Buffa G, Fratini L, Arregi B, et al. A new friction stir welding based technique for corner fillet joints: experimental and numerical study[J]. International Journal of Material Forming, 2010, 3(1): 1039-1042.
    [7] Li J Q, Liu H J. Design of tool system for the external nonrotational shoulder assisted friction stir welding and its experimental validations on 2219-T6 aluminum alloy[J]. The International Journal of Advanced Manufacturing Technology, 2013, 66(5-8): 623-634.
    [8] Li J Q, Liu H J. Effects of tool rotation speed on microstructures and mechanical properties of AA2219-T6 welded by the external non-rotational shoulder assisted friction stir welding[J]. Materials Design, 2013, 43: 299-306.
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  • 收稿日期:  2014-05-16

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