Microstructure and mechanical properties of friction stir welded joint of 2A14-T4 aluminum alloy thick plate

LIU Huijie; GAO Yisong; ZHANG Quansheng; ZHAO Huihui

doi:10.12073/j.hjxb.20210615001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2022 > 43(6): 20-24, 42. > DOI: 10.12073/j.hjxb.20210615001

LIU Huijie, GAO Yisong, ZHANG Quansheng, ZHAO Huihui. Microstructure and mechanical properties of friction stir welded joint of 2A14-T4 aluminum alloy thick plate[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(6): 20-24, 42. DOI: 10.12073/j.hjxb.20210615001

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Microstructure and mechanical properties of friction stir welded joint of 2A14-T4 aluminum alloy thick plate

1.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China
2.
Shanghai Aerospace Equipment Manufacturing General Factory Co., Ltd., Shanghai, 200245, China

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Received Date: June 14, 2021
Available Online: April 07, 2022

Graphical Abstract

Abstract

Abstract

With the progress of industrial technology, aerospace, transportation and other fields put forward higher and higher demand for the bearing capacity of components. In this paper, friction stir welding method was used to join 9 mm thick 2A14-T4 aluminum alloys.The microstructure and mechanical properties of high strength thick aluminum alloy plate joints along the thickness direction were studied. The results indicate that the butt joint has good appearance at the rotating speed of 400 r/min and the welding speed of 100 min/min, and the tensile strength of the joint is 360 MPa, which is 83.9 % of the base metal. There are significant differences in the microstructures of the joint along the thickness direction. The average grain diameters of the top, middle and bottom of the weld are 7.9 , 5.0and 2.8 μm, respectively. The dimples at the bottom of the joint are equiaxed, with small diameter and shallow depth. The fracture position and the minimum microhardness of the joint appear in the thermo-mechanically affected zone of retreating side. The microhardness of the top, middle and bottom of the weld are 99.9 , 97.9 and 94.7 HV, respectively.
- friction stir welding,
- aluminum alloy,
- microstructure,
- mechanical properties

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References (12)

References

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Microstructure and mechanical properties of friction stir welded joint of 2A14-T4 aluminum alloy thick plate