New Technique to Repair Keyhole of 2195 Al-Li Alloy Friction Stir Welding Joints

被引：0
|
作者：
Meng, Xiangchen [1 ,2 ]
Chen, Xi [1 ]
Han, Zhulin [1 ]
Yuan, Jingyu [1 ]
Xie, Yuming [1 ,2 ]
Dong, Jihong [3 ]
Xia, Peiyun [4 ]
Huang, Yongxian [1 ,2 ]
机构：
[1] Harbin Inst Technol, State Key Lab Precis Welding & Joining Mat & Struc, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Zhengzhou Res Inst, Zhengzhou 450046, Peoples R China
[3] AVIC Mfg Technol Inst, Beijing 100024, Peoples R China
[4] Shanghai Aerosp Equipment Manufacturer Co Ltd, Shanghai 200245, Peoples R China
来源：
MATERIALS | 2024年 / 17卷 / 14期
基金：
黑龙江省自然科学基金;
关键词：
2195 Al-Li alloy; keyhole; friction stir processing; tungsten inert gas welding; mechanical properties; MICROSTRUCTURE; AA2195;
D O I：
10.3390/ma17143418
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Aiming at the repairing of keyhole defects after friction stir welding of complex structures, a new method combined with tungsten inert gas welding (TIG) and friction stir processing (FSP) was proposed. The results showed that the pre-filling wire of TIG can completely fill the volumetric keyhole. FSP can refine the coarse grain area into equiaxial grains due to dynamic recrystallization, while some pore defects are eliminated. The interface bonding quality is high. The microhardness of the repairing zone with FSP is significantly stronger than that of the untreated parts. Compared to direct TIG repairing, the introduction of FSP transformed the fracture from brittle fracture to ductile fracture, and the tensile strength of the joint was increased by 131.7%, realizing the high-quality repairing of keyhole defects in 2195 Al-Li alloy.
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页数：12
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