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2195铝锂合金无减薄搅拌摩擦焊组织与性能研究 |
王非凡1,厉晓笑1,马潇天2,3,谢聿铭2,3,黄永宪2,3,孟祥晨2,3
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1. 北京宇航系统工程研究所,北京 100076;2. 先进焊接与连接国家重点实验室,哈尔滨工业大学,
哈尔滨 150001;3. 郑州研究院,哈尔滨工业大学,郑州 450046
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摘要: |
针对传统搅拌摩擦焊焊缝减薄问题,提出了基于内、外差异轴肩结构设计的无减薄搅拌摩擦焊接方法,实现了2195铝锂合金的一次焊接二次成形焊接。结果表明,6mm厚2195-T8铝锂合金焊后接头无厚度减薄,内部无缺陷,接头抗拉强度达到395MPa,达到母材的68%,接头截面显微硬度呈“W”形分布,拉伸试样断裂于热影响区,呈45°斜角的典型韧性断裂特征。 |
关键词: 2195铝锂合金;无减薄;搅拌摩擦焊;微观组织;力学性能 |
基金项目:国家自然科学基金项目(U21**004、521**301、522**350) |
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Microstructures and Mechanical Properties of Non-weld-thinning Friction Stir Welded 2195 Aluminum Alloys |
Wang Feifan1, Li Xiaoxiao1, Ma Xiaotian2,3, Xie Yuming2,3, Huang Yongxian2,3, Meng Xiangchen2,3
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1. Beijing Institute of Astronautical Systems Engineering, Beijing 100076;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001;3. Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450046
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Abstract: |
Aiming at the problem of weld thinning in conventional friction stir welding joints, non-weld-thinning friction stir welding tool was proposed and manufactured. Two shoulders with different diameters at one side was designed instead of single should of conventional friction stir welding, realizing the actions of first welding and double forming. The results showed that, 6mm thick 2195-T8 aluminum alloy joint after welding has no obvious weld thinning and inner defects. The microhardness distribution presents W shape. The maximum tensile strength of non-weld-thinning joints reached 395MPa, where the joint fractured at heat affected zone, presenting typical ductile fracture characteristics. |
Key words: 2195 Al-Li alloys;non-weld-thinning;friction stir welding;microstructures;mechanical properties |