Fatigue properties of AZ31 magnesium alloy welded joint by double-sided friction stir welding

YAN Zhifeng; WANG Zhuoran; WANG Shubang; ZHANG Hongxia; HE Xiuli; DONG Peng

doi:10.12073/j.hjxb.20211119001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2022 > 43(6): 61-68. > DOI: 10.12073/j.hjxb.20211119001

YAN Zhifeng, WANG Zhuoran, WANG Shubang, ZHANG Hongxia, HE Xiuli, DONG Peng. Fatigue properties of AZ31 magnesium alloy welded joint by double-sided friction stir welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(6): 61-68. DOI: 10.12073/j.hjxb.20211119001

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Fatigue properties of AZ31 magnesium alloy welded joint by double-sided friction stir welding

1.
Taiyuan University of Technology, Taiyuan, 030024, China
2.
Department of Mechanical Engineering, Taiyuan Institute of Technology, Taiyuan, 030008, China

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Received Date: November 18, 2021
Available Online: April 18, 2022

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Abstract

Abstract

In order to solve the problem of the low fatigue strength of single-sided welding (SSFSW) caused by the uneven heat input, double-sided friction stir welding (DSFSW) was used to weld AZ31 magnesium alloy with a thickness of 10 mm. The results show that the yield strength of DSFSW joint is 130 MPa, which is 5% higher than that of the SSFSW joint. The fatigue limit of the DSFSW joint is 88 MPa, which is 76% higher than that of the SSFSW joint. The fatigue crack of DSFSW joint starts at the advancing side of the upper/lower side, crossing the interface of the upper/lower weld seam and breaking in the retreating side (RS) of the one weld seam finally. The fatigue fracture surface of DSFSW is brittle fracture mainly composed of cleavage. The strain range of one side of DSFSW joint is close to the RS strain of SSFSW. The fatigue strength and life of magnesium alloy joint welded by DSFSW have been greatly increased.
- AZ31B magnesium alloys,
- double-sided friction stir welding,
- fatigue limit,
- fatigue fracture,
- fatigue deformation

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References (19)

References

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Fatigue properties of AZ31 magnesium alloy welded joint by double-sided friction stir welding