外加辅助条件搅拌摩擦焊技术研究进展

doi:10.11896/cldb.19050125

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Abstract Friction stir welding (FSW) is a widely used solid phase joining technology. However, there are still a few problems for some metals such as high welding difficulty, coarse grain size, the difficulty of controlling the intermetallic compounds (IMC) in FSW joints of different materials, and the further improvement of mechanical properties of joints, which seriously hinders the development of FSW technology. Adding auxiliary conditions under the basis of the conventional FSW can effectively overcome the defects of the conventional FSW and improve the quality of the FSW joint. Limited heat production of the conventional FSW process, causing serious wear on the tool and large axial force during progress for some materials even cannot getting effective FSW joint. The researcher study on adding preheating method before welding and ultrasonic assisting during process, which effectively softened the welding material, reduced the wear of the tool during welding, reduced the axial force during welding, and improved the welding effectiveness. There are large crystal grains existed in the conventional FSW joints. The researchers used the mechanical vibration of ultrasonic to break up the dynamic recrystallized grains during the welding process, and the energy provided by the ultrasonic increases the dislocation density in the joints. The addition of the external cooling in the progress take the heat generated away, the joint can be cool rapidly, shorten grain growth time, and inhibit crystal grains growth in the joint. Most of IMCs are brittle hard phases, and they are crack sources and extension paths for joint fractures formed in the dissimilar FSW joints. The addition of ultrasonic assist can break up the formed IMC and inhi-bit formation IMC in the joint. The external cooling method can quickly take away the heat which generated in the welding process and inhibit the IMC growth. The researchers studied the effects of additional auxiliary conditions of preheating, ultrasonic and cooling conditions on the perfor-mance of joints in order to further expand the application field of FSW. These methods improve the material fluidity, obtain sound joint interface and avoiding the weld defects, which can soften the welding material with reduce the flow resistance of the material properties of the joint. This paper summarizes the additional auxiliary conditions FSW technology from the perspective of beneficial effects with additional auxiliary conditions. The latest research progress of different auxiliary methods in FSW process, grain refinement, IMC control and mechanical properties improvement are reviewed. The basic principles that various assistant modes with different beneficial effects are analyzed. This paper provide refe-rence for FSW researchers.

Key words： friction stir welding additional auxiliary conditions intermetallic compound refine grains

Published: 22 April 2021

CLC number:

TG453

Fund:National Natural Science Foundation of China (51175255), Jiangxi Provincial Natural Science Foundation Project (20171BAB216033),Jiangxi Provincial Department of Education Science and Technology Research Project (GJJ170501), Ganzhou Science and Technology Plan Project Science and Technology Innovation Talent Program, Jiangxi University of Science and Technology PhD Foundation Funded Project(jxxjbs16001).

About author:: Jincheng Zeng, a graduate student of Jiangxi University of Science and Technology. From September 2014 to June 2018, he obtained a bachelor's degree from Jiangxi University of Science and Technology. From September 2018 to present, he has been studying for a master's degree at Jiangxi University of Science and Technology.
Yongfang Dengreceived his B.E. degree from Southwest Jiaotong University in 2008 and received his Ph.D. degree in machinery manufacturing and automation from College of mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, in 2015. He is currently an associate professor in Engineering Research Institute, Jiangxi University of Science and Technology. His research interest is friction stir welding. In recent years, more than 10 papers have been published in the field of friction stir welding.

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	ZENG Jincheng
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Cite this article:

ZENG Jincheng,SONG Bo,ZUO Dunwen, et al. Research Progress of Friction Stir Welding with Additional Auxiliary Conditions[J]. Materials Reports, 2021, 35(7): 7162-7168.

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http://www.mater-rep.com/EN/10.11896/cldb.19050125 OR http://www.mater-rep.com/EN/Y2021/V35/I7/7162

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