Effect of Different Heat Input on Microstructure and Properties of 7A52 Aluminum Alloy Oscillating MIG Welding Joints

JIANG Chengyun; ZHU Jialei; WANG Chengyuan; QI Shikong; ZHANG Ziyue; LIU Ting; LI Zhehui

doi:10.3969/j.issn.1674-6457.2025.07.016

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (7) : 145-152. DOI: 10.3969/j.issn.1674-6457.2025.07.016

Light Alloy Forming

Effect of Different Heat Input on Microstructure and Properties of 7A52 Aluminum Alloy Oscillating MIG Welding Joints

JIANG Chengyun, ZHU Jialei, WANG Chengyuan, QI Shikong, ZHANG Ziyue, LIU Ting, LI Zhehui

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Abstract

The work aims to study the effects of oscillating MIG welding technology on the microstructural changes and weld joint formation. The research method involved conducting groove oscillating MIG welding experiments on 7A52 aluminum alloy plates with varying heat inputs and analyzing the resulting weld joints for microstructure and mechanical properties, including hardness and tensile tests. The results indicated that at a heat input of 8.56 kJ/mm, the weld joint demonstrated optimal formation and mechanical attributes. It had an average Vickers hardness of 111.7HV and the lowest hardness of 104.7HV was found in the weld area, whereas the heat affected zone (HAZ) exhibited the highest hardness, reaching 114.52HV. Tensile testing indicated that the specimen broke in the weld area with a strength of 361 MPa, which corresponded to 72% of the base material's tensile strength. In conclusion, as the heat input increases, there is a gradual decrease in the hardness of the weld zone. Furthermore, the right amount of heat input is beneficial for the development of slender, equiaxed grains, reducing recrystallization, and thus enhancing the tensile strength of the weld joint.

Key words

7A52 aluminum alloy / oscillating MIG welding / microstructure analysis / hardness testing / tensile properties

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JIANG Chengyun, ZHU Jialei, WANG Chengyuan, QI Shikong, ZHANG Ziyue, LIU Ting, LI Zhehui. Effect of Different Heat Input on Microstructure and Properties of 7A52 Aluminum Alloy Oscillating MIG Welding Joints[J]. Journal of Netshape Forming Engineering. 2025, 17(7): 145-152 https://doi.org/10.3969/j.issn.1674-6457.2025.07.016

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