Dissimilar friction stir spot welding of AA2024-T3/AA7075-T6 aluminum alloys under different welding parameters and media
Dissimilar friction stir spot welding of AA2024-T3/AA7075-T6 aluminum alloys under different welding parameters and media
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DOI：
10.1016/j.dt.2020.03.008
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发表时间：
2021-04-01
影响因子：
5.1
通讯作者：
Ojo, Olatunj Oladimeji
中科院分区：
文献类型：
--
作者：
Zhang, Gui-ju;Xiao, Cai-yuan;Ojo, Olatunj Oladimeji
研究了AA 2024-T3/AA 7075-T6铝合金在常温和水下环境下的搅拌摩擦点焊，分析了接头的熔核特征、显微组织、断口形貌和力学性能。结果表明，水冷却介质在AA 2024-T3/AA 7075-T6焊接接头中表现出显著的吸热能力。熔核特征，如搅拌区宽度，圆形压痕，平均晶粒尺寸，和角材料间的挂钩减少了水的冷却效果在关节。水下焊接接头中形成了较窄的白色（夹层结构）带，而在常温和水下焊接接头中分别形成了Mg 2Si和Al 2CuMg析出相。工具旋转速度（600-1400 rpm）和插入深度（0.1-0.5 mm）的增加增加了在环境和水下环境中焊接的AA 2024-T3/AA 7075-T6接头的拉伸剪切力。在常温和水下焊缝中分别获得了5900 N和6700 N的最大拉剪力。(C)2020中国园艺学会Elsevier B. V.代表KeAi Communications Co.
This paper studies the friction stir spot welding of AA2024-T3/AA7075-T6 Al alloys in the ambient and underwater environments by clarifying the nugget features, microstructure, fracture and mechanical properties of the joints. The results show that the water-cooling medium exhibits a significant heat absorption capacity in the AA2024-T3/AA7075-T6 welded joint. Nugget features such as stir zone width, circular imprints, average grain sizes, and angular inter-material hooking are reduced by the water-cooling effect in the joints. Narrower whitish (intercalated structures) bands are formed in the underwater joints while Mg2Si and Al2CuMg precipitates are formed in the ambient and the underwater welded joints respectively. An increase in tool rotational speed (600-1400 rpm) and plunge depth (0.1-0.5 mm) increases the tensile-shear force of the welded AA2024-T3/AA7075-T6 joints in both the ambient and underwater environments. The maximum tensile-shear forces of 5900 N and 6700 N were obtained in the ambient and the underwater welds respectively. (C) 2020 China Ordnance Society. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co.