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Microstructure characteristics and mechanical properties of stationary shoulder friction stir welded 2219-T6 aluminium alloy at high rotation speeds

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Abstract

Stationary shoulder friction stir welding has been used to weld 4-mm-thick 2219-T6 aluminium alloy at high rotation speeds. Strain plastic damage was applied to demonstrate the formation mechanism of welding defects at high rotation speeds above 2000 rpm. A three-way converging zone in the joint, in which materials of different microstructure characteristics converged from three directions during high tool rotation speed welding, was found. At the relatively high tool rotation speed, the significant differences in the microstructures would result in weld defects in this zone. It could be attributed to material toughness damage at high strain rate. With increasing tool rotation speed, the tensile strength of the joint constantly decreased. When the tool rotation speed varied from 2000 to 2600 rpm, the tensile strength decreased from 305 MPa (68.2% of the BM) to 238 MPa (53.2% of the BM).

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Funding

The authors are grateful to be supported by the National Key Research and Development Program of China (2018YFB1306404), by the Key areas Research and Development Program of Guangdong Province (2019B090921003), by the Province Science and Technology Plan Project of Guangdong (2015B090922011), by the Science and Technology Plan Project of Guangzhou City (201807010063 and 201807010068) and by the National Natural Science Foundation of China (51905112).

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Authors and Affiliations

  1. Department of material science and engineering, Shenyang University of Technology, Shenyang, 110870, Liaoning, China

    Jiaqing You, Chunlin Dong & Yunhai Su

  2. Guangdong Welding Institute (China-Ukraine E.O. Paton Institute of Welding), Guangdong Provincial Key Laboratory of Advanced Welding Technology, Guangzhou, 510651, China

    Jiaqing You, Yunqiang Zhao, Chunlin Dong, Chungui Wang, Shu Miao & Yaoyong Yi

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  1. Jiaqing You
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  2. Yunqiang Zhao
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Correspondence to Yunqiang Zhao or Chunlin Dong.

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You, J., Zhao, Y., Dong, C. et al. Microstructure characteristics and mechanical properties of stationary shoulder friction stir welded 2219-T6 aluminium alloy at high rotation speeds. Int J Adv Manuf Technol 108, 987–996 (2020). https://doi.org/10.1007/s00170-019-04594-1

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  • DOI: https://doi.org/10.1007/s00170-019-04594-1

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