Effect of Rotation Speed on Microstructure and Properties of 6061-T6 Aluminum Alloy High-Speed Friction Stir Welded Joint

HU Fengfeng; LIN Yongyong; ZHANG Huade; JIA Hepeng

doi:10.11973/jxgccl202205009

Materials and Mechanical Engineering > 2022 > 46(5): 53-57. > DOI: 10.11973/jxgccl202205009

HU Fengfeng, LIN Yongyong, ZHANG Huade, JIA Hepeng. Effect of Rotation Speed on Microstructure and Properties of 6061-T6 Aluminum Alloy High-Speed Friction Stir Welded Joint[J]. Materials and Mechanical Engineering, 2022, 46(5): 53-57. DOI: 10.11973/jxgccl202205009

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Effect of Rotation Speed on Microstructure and Properties of 6061-T6 Aluminum Alloy High-Speed Friction Stir Welded Joint

1. Aerospace Engineering Equipment (Suzhou) Co., Ltd., Suzhou 215104, China;
2. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

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Received Date: March 14, 2021
Revised Date: March 31, 2022

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Abstract

Abstract

Friction stir welding was carried out on 3 mm and 4 mm thick 6061-T6 aluminum alloy plates at high welding speeds (3 000 mm·min^-1), respectively. The effect of high rotational speed (4 000-6 000 r·min^-1) on microstructure and tensile properties of the joints was studied. The results show that the smaller the rotation speed, the easier the formation of hole defects. The higher the rotation speed was, the easier the overheated oxidation appeared. Increasing rotation speed was conducive to the recrystallization of the joint area to form a dense structure. The welding defects of welded joints of 4 mm thick aluminum alloy plates were more serious than those of welded joints of 3 mm thick aluminum alloy plates. The welding joint quality and tensile properties of 3 mm thick aluminum alloy plate at a rotation speed of 5 000 r·min^-1 were the best, and the tensile strength and elongation after fracture were 265.82 MPa and 4.58%, respectively. The welding joint quality and tensile properties of 4 mm thick aluminum alloy plate at a rotation speed of 6 000 r·min^-1 were the best, and the tensile strength and elongation after fracture were 212.14 MPa and 4.03%, respectively.
- friction stir welding,
- aluminum alloy,
- rotation speed,
- tensile property

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Effect of Rotation Speed on Microstructure and Properties of 6061-T6 Aluminum Alloy High-Speed Friction Stir Welded Joint

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