Research on Improving Formation and Strength of Medium-thick AA6061 Al/AZ31B Mg Joint by Submerged Friction Stir Welding

HUANG Tifang; WAN Long; GAO Yihan; HUANG Yongxian

doi:10.7512/j.issn.1001-2303.2023.03.10

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Research on Improving Formation and Strength of Medium-thick AA6061 Al/AZ31B Mg Joint by Submerged Friction Stir Welding
Vol. 53, Issue 3, Pages: 83-90(2023)
DOI： 10.7512/j.issn.1001-2303.2023.03.10

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黄体方，万龙，高祎晗，等.水下搅拌摩擦焊改善中厚度铝/镁成形和性能的研究［J］.电焊机，2023，53（3）：83-90.

HUANG Tifang, WAN Long, GAO Yihan, et al.Research on Improving Formation and Strength of Medium-thick AA6061 Al/AZ31B Mg Joint by Submerged Friction Stir Welding[J].Electric Welding Machine, 2023, 53(3): 83-90.
黄体方，万龙，高祎晗，等.水下搅拌摩擦焊改善中厚度铝/镁成形和性能的研究［J］.电焊机，2023，53（3）：83-90. DOI： 10.7512/j.issn.1001-2303.2023.03.10.

HUANG Tifang, WAN Long, GAO Yihan, et al.Research on Improving Formation and Strength of Medium-thick AA6061 Al/AZ31B Mg Joint by Submerged Friction Stir Welding[J].Electric Welding Machine, 2023, 53(3): 83-90. DOI： 10.7512/j.issn.1001-2303.2023.03.10.

摘要

以厚度6 mm的铝/镁异种材料的搅拌摩擦焊为研究对象，分别在空气以及26.5 ℃和5 ℃的水下环境下进行焊接，对比研究不同环境下的接头的微观组织、接头性能，并对粘头机理进行探究。结果表明，水下搅拌摩擦焊能够有效降低焊接过程温度，抑制脆性Al-Mg金属间化合物的长大，缓解搅拌头粘头现象，能有效改善焊缝成形和接头力学性能。5 ℃冷却水环境下得到的铝/镁搅拌摩擦焊接头的拉伸性能和延伸率最高，达到129.3 MPa和4.4%，分别是常规空冷接头的1.8和3.9倍。同时揭示了搅拌头粘着材料主要由Mg,2,Al,3,和Al固溶体组成，说明搅拌头粘头现象与Al-Mg金属间化合物的生成直接相关。

Abstract

Pissimilar friction stir welding of aluminum/magnesium with 6 mm thickness was carried out in air and under water of 26.5 ℃ and 5 ℃. The microstructures and mechanical property of joints welded in different environments were studied and compared. The mechanism of tool adhesion was explored. The results showed that submerged friction stir welding effectively could reduce the temperature of the welding process, inhibit the growth of brittle Al-Mg intermetallic compounds, alleviate the phenomenon of tool adhension, and improve the weld formation and mechanical properties of the joint. The aluminum/magnesium dissimilar joint fabricated under 5 ℃water had the highest tensile properties and elongation of 129.3 MPa and 4.4%, 1.8 and 3.9 times that of air-cooled joints, respectively. It also revealed that the tool adhesive materials were mainly composed of Mg,2,Al,3, and Al solid solution, indicating that the tool adhesive phenomenon was directly related to the generation of Al-Mg intermetallic compounds.

关键词

铝/镁异种材料连接水下搅拌摩擦焊金属间化合物拉伸性能

Keywords

Al/Mgdissimilar materials joiningsubmerged friction stir weldingintermetallic compoundtensile strength

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