Microstructure and Mechanical Properties of Friction Stir Welding Joint of Pure Copper

Abstract:

Microstructures and mechanical properties of pure copper weld joints are discussed under different parameters of friction stir welding. The results reveal that it is conducive to the formation of compact joint in friction stir welding by applying high speed steel tool with high anti-bonding temperature. The friction stir welding joint with compact and defect-free microstructure could be obtained when the tool rotation rate is 1250- 1650 r/min and the tool traverse speed is 20-50 mm/min. Intensively plastic deformation occurs in the soften materials of the weld nugget zone and numerous crystal particles are broken under the influence of tool stirring. The microstructure of weld nugget zone is composed of tiny isometric crystals, which is due to the dynamic recrystallization of broken crystal particles. The structure of thermo-mechanical affected zone on both sides is asymmetric. Obvious boundary of the thermo affected zone could be seen on the advancing side, and the plastic streamline is apparent.

• Periodical: Advanced Materials Research (Volumes 418-420)
• Pages: 1520-1523
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.418-420.1520
• Online since: December 2011
• Authors: Yong Zhao, You Li Ye, Keng Yan, Li Long Zhou
• Keywords: Friction Stir Welding (FSW), Mechanical Property, Microstructure, Pure Copper

References

[1] Xijing Wang, Chaobing Da and Jing Li: J Lanzhou Univ. Tech. Vol.32(2006),p.25 In Chinese

[2] Xiaowen Liu, Chaogai Xue and Xiaojian Zhang. Weld. Vol.12(2003),p.9 In Chinese

[3] Bing Xiao, Liming Ke and Weilan Wang. Elec. Weld. Mach. Vol.22 (2004), p.125 In Chinese

[4] Chen Hua Bin. Master's thesis of Jiangsu Univ. Sci. Tech. 2005 In Chinese

[5] A.A. Hassan, A.F. Norman and D.A. Price. Acta Mater. Vol.51 (2003), p.1923

[6] R.W. Fonda, J.F. Bingert and K.J. Colligan.Scripta Mater. Vol.51 (2004), p.243