Research on Welding Process and Joint Microstructure-properties of Bobbin Tool Friction Stir Weld for 2219 Aluminum Alloy

被引：0
|
作者：
Zhang H. [1 ,2 ]
Hao Y. [3 ]
Li G. [1 ,2 ]
Yan X. [3 ]
Yang H. [1 ,2 ]
Zhou L. [1 ,2 ]
机构：
[1] State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin
[2] Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology at Weihai, Weihai
[3] Capital Aerospace Machinery Corporation, Beijing
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2022年 / 58卷 / 22期
关键词：
2219 aluminum alloy; bobbin tool friction stir welding; mechanical properties; microstructure;
D O I：
10.3901/JME.2022.22.250
中图分类号：
学科分类号：
摘要：
Bobbin tool friction stir welding of 8 mm thick 2219 aluminum alloy sheets is carried out, and the influence of welding speed on the microstructure and mechanical properties of the welded joints are investigated. The results show that at the rotational rate is 200 r/min, sound joints can be obtained under the various welding speeds. As the welding speed increases, the heat input decreases, so that the size of the recrystallized grains gradually decreases. The hardness change of 2219 aluminum alloy can be attributed to the distribution of precipitates phase particles and the heterogeneity of grains. The lowest hardness zones are located at the heat-affected zones of the joint. With the increase of welding speed, the lowest hardness and tensile strength of the welded joints increase gradually. The welded joints fracture in the boundary of the HAZ and TMAZ. When the welding speed is 350 mm/min, the tensile strength reaches the maximum value of 335 MPa, which corresponds to 72.8% of that of the base metal. © 2022 Editorial Office of Chinese Journal of Mechanical Engineering. All rights reserved.
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页码：250 / 257
页数：7
相关论文
共 23 条
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