Study on microstructure and properties of friction plug welding joint for 2060-T8 aluminum alloy

Yanjun GAO; Xiwei LIU; Xusheng LIU; Zhen SHAO; Lei CUI

doi:10.7512/j.issn.1001-2303.2022.07.10

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Study on microstructure and properties of friction plug welding joint for 2060-T8 aluminum alloy
Vol. 52, Issue 7, Pages: 69-75(2022)
DOI： 10.7512/j.issn.1001-2303.2022.07.10

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高彦军，刘西伟，刘旭升，等.2060-T8铝锂合金顶锻式摩擦塞补焊接头组织性能研究［J］.电焊机，2022，52（7）：69-75.

GAO Yanjun, LIU Xiwei, LIU Xusheng, et al.Study on microstructure and properties of friction plug welding joint for 2060-T8 aluminum alloy[J].Electric Welding Machine, 2022, 52(7): 69-75.
高彦军，刘西伟，刘旭升，等.2060-T8铝锂合金顶锻式摩擦塞补焊接头组织性能研究［J］.电焊机，2022，52（7）：69-75. DOI： 10.7512/j.issn.1001-2303.2022.07.10.

GAO Yanjun, LIU Xiwei, LIU Xusheng, et al.Study on microstructure and properties of friction plug welding joint for 2060-T8 aluminum alloy[J].Electric Welding Machine, 2022, 52(7): 69-75. DOI： 10.7512/j.issn.1001-2303.2022.07.10.

摘要

采用不同焊接压力对2060-T8铝锂合金进行了顶锻式摩擦塞补焊试验研究，分析了接头微观组织特征，第二相分布规律以及力学性能。结果表明：增大焊接压力可有效消除接头未焊合及孔洞缺陷。接头热影响区晶粒尺寸增大，热机械影响区及塞棒热机械影响区晶粒发生明显塑性变形，母材与塞棒之间产生了细小的等轴晶组织。接头不同区域较母材均发生软化，硬度最低值出现在塞棒热机械影响区，约为90 HV。当焊接压力为30 kN时，接头抗拉强度最高，达到378.9 MPa，断后伸长率为5.9%，接头系数为0.746。接头断裂方式为韧性断裂。

Abstract

In this work, friction plug welding of 2060-T8 Al-Li alloy was carried out with different welding force. The microstructure characteristics, second phase distribution and mechanical properties of the joints were analyzed. The results show: increasing welding force can effectively eliminate the lack of bonding defect and the hole defect. The grain size in heat affected zone increases, and severe plastic deformation occurs in thermo-mechanical affected zone and plug thermo-mechanical affected zone. Fine equiaxed crystal structures are formed between base material and plug. Compared with base material, different regions of the joint soften and the lowest hardness value is about 90 HV, which is in thermo-mechanical affected zone. When the welding force is 30 kN, the tensile strength and the elongation of the joint can reach 378.9 MPa and 5.9% respectively. And the joint coefficient is 0.746. The fracture mode of the joint is ductile fracture.

关键词

顶锻式摩擦塞补焊2060-T8铝锂合金微观组织力学性能

Keywords

Friction plug welding2060-T8 Al-Li alloymicrostructuremechanical properties

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