Microstructures and properties of 2219-T87 aluminum alloy friction pull plug welds

DU Bo; YANG Xinqi; SUN Zhuanping; WANG Dongpo

doi:10.12073/j.hjxb.2019400055

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2019 > 40(2): 128-132. > DOI: 10.12073/j.hjxb.2019400055

DU Bo, YANG Xinqi, SUN Zhuanping, WANG Dongpo. Microstructures and properties of 2219-T87 aluminum alloy friction pull plug welds[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(2): 128-132. DOI: 10.12073/j.hjxb.2019400055

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Microstructures and properties of 2219-T87 aluminum alloy friction pull plug welds

1. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300350, China;
2. Tianjin Changzheng Rocket Manufacturing Co., Ltd., Tianjin 300451, China

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Received Date: December 17, 2017

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Abstract

Friction pull plug welding (FPPW) experiments were performed for 6mm thick 2219-T87 aluminum alloy. The microstructures, microhardness, tensile strength and tensile fracture surface of FPPW joints were observed and tested respectively. It is verified that metallurgical combination was realized between 2219-T87 plate and 2219-T87 plug using optimized FPPW process. In FPPW process, plug was subjected to tensile stress. Joint design and welding parameters are optimized to prevent plug from being broken off. Lack of bonding was the main defect for FPPW joint, which was easily formed near the upper surface. Softening was observed in the weld zone, the minimum hardness (84.4 HV) appeared in plug thermo-mechanical affected zone. The tensile strength and elongation of FPPW joint can reach to 326.4 MPa and 4.45%, which are equivalent to 71.7% and 44.5% of the base metal. The tensile fracture morphologies are characterized by dimples.
- friction pull plug welding,
- 2219-T87 aluminum alloy,
- process characteristic,
- microstructure,
- mechanical property

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