Microstructure and mechanical properties of non-weld-thinning friction stir welded 6082-T6 aluminum alloy joints

LI Chong; TIAN Yalin; QI Zhenguo; WANG Wei; YANG Yanlong; WANG Yijing

doi:10.12073/j.hjxb.20220104001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2022 > 43(6): 102-107. > DOI: 10.12073/j.hjxb.20220104001

LI Chong, TIAN Yalin, QI Zhenguo, WANG Wei, YANG Yanlong, WANG Yijing. Microstructure and mechanical properties of non-weld-thinning friction stir welded 6082-T6 aluminum alloy joints[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(6): 102-107. DOI: 10.12073/j.hjxb.20220104001

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Microstructure and mechanical properties of non-weld-thinning friction stir welded 6082-T6 aluminum alloy joints

Hebei Jingche Rail Transit Vehicle Equipment Co.,Ltd., Baoding, 072150,China

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Received Date: January 03, 2022
Available Online: June 23, 2022

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Abstract

Abstract

Based on the "zero plunge depth" concept, a tapered threaded pin with triple facets and a shoulder with a circular groove were designed to solve the weld-thinning problem in the friction stir welding of 6082-T6 aluminum alloy used in the railway fields. The results indicated that the increase of the rotational speed could increase the heat input and inhibit the formation of the defects when the welding speed was constant. Compared with the parameter of 400 r/min, the process window at 600 r/min was effectively broadened, and the welding speed could reach 400 mm/min. The heat input was under the coupling effect of welding speed and rotational speed. The welding joint was prone to coarse microstructure under the high heat input, which affected the strength of the welded joint. Under the rotational speed of 600 r/min and the welding speed of 500 mm/min, the tensile strength of the joint reach 254 MPa, reaching 80% of the base material.
- non-weld-thinning friction stir welding,
- 6082-T6 aluminum alloy,
- microstructure,
- mechanical properties

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References

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Microstructure and mechanical properties of non-weld-thinning friction stir welded 6082-T6 aluminum alloy joints