Repairing of exit-hole in friction-stir-spot welded joints for 2024-T4 aluminum alloy by resistance welding

Lipeng Deng; Pengliang Niu; Liming Ke; Jinhe Liu; Jidong Kang

doi:10.1007/s12613-022-2561-x

Volume 30 Issue 4

Apr. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(4): 660-669

Lipeng Deng, Pengliang Niu, Liming Ke, Jinhe Liu, and Jidong Kang, Repairing of exit-hole in friction-stir-spot welded joints for 2024-T4 aluminum alloy by resistance welding, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 660-669. https://doi.org/10.1007/s12613-022-2561-x

Cite this article as:

Lipeng Deng, Pengliang Niu, Liming Ke, Jinhe Liu, and Jidong Kang, Repairing of exit-hole in friction-stir-spot welded joints for 2024-T4 aluminum alloy by resistance welding, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 660-669. https://doi.org/10.1007/s12613-022-2561-x

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Research Article

Repairing of exit-hole in friction-stir-spot welded joints for 2024-T4 aluminum alloy by resistance welding

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Corresponding author:
Lipeng Deng E-mail: denglipeng@nchu.edu.cn
Received: 21 July 2022; Revised: 19 October 2022; Accepted: 21 October 2022; Available online: 25 October 2022

Abstract

Abstract

The exit-hole in friction stir spot welded (FSSWed) 2024-T4 aluminum alloy joints was successfully repaired by using a three-phase secondary rectification resistance spot welding machine, which is termed as filling exit-hole based on resistance welding (FEBRW). The filling dynamic behavior of force was recorded by a device monitoring. Optical microscope (OM), electron backscatter diffraction (EBSD), and tensile shear tests and finite element modelling were conducted to investigate the repairing stages and bonding mechanisms of the repaired joints in detail. Results showed that exit-hole was completely filled and repaired experiencing three stages. Metallurgical bonding was achieved between plug and exit-hole wall in two forms, including melting bonding in the middle of the joints and partial diffusion bonding on both the upper and bottom of the joints. The highest tensile shear strength of the repaired joints was 7.43 kN, which was 36.3% higher than that of the as welded joints. Resistance welding paves an efficient way to repair the exit-hole in FSSWed joints.
- resistance welding;
- exit-hole;
- repairing;
- bonding mechanisms

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