Microstructure and Mechanical Properties of Refill Friction Stir Spot Welded 7475 Aluminum Alloy Joints

被引：0
|
作者：
Lu Zhenyang [1 ]
Gong Wentao [1 ]
Chen Shujun [1 ]
Yuan Tao [1 ]
Li Xiaoxu [1 ]
机构：
[1] Beijing Univ Technol, Beijing 100124, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2019年 / 48卷 / 04期
关键词：
refilled FSSW welding; microstructure; technological parameter; fracture mode; HOOK FORMATION; TOOL GEOMETRY; FAILURE;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The 7475 aluminum alloy backfill friction stir spot welding (FSSW) was studied. Firstly, the 2 mm 7475 aluminum alloy was welded by different process parameters, then the surface and cross section of the joint were observed, and the hardness and tensile shear test of the sample were carried out. The results show that the joint can be divided into four parts according to the weld microstructure, and the grain size of different parts is different. Hook, holes and unjointed microstructures due to poor fluidity of the material are found in the microstructure. At the same time, the hardness of the base metal zone and stirring zone is significantly higher than that of the heat affected zone and the thermo-mechanically affected zone; in addition, the highest hardness and tensile shear strength of the joint vary with welding tool rotation speed and the depth of the sleeve. However, the effect of the stirring sleeve movement rate on the mechanical properties of the solder joint is not obvious.
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页码：1267 / 1274
页数：8
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