Effect of Pin Offset on Welding Process, Joint Microstructure and Mechanical Property in Al/Cu Dissimilar Friction Stir Welding

SU Hao; LI Xue; ZHAO Qingzhen; CHEN Ji; WU Chuansong

doi:10.7512/j.issn.1001-2303.2023.03.11

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Effect of Pin Offset on Welding Process, Joint Microstructure and Mechanical Property in Al/Cu Dissimilar Friction Stir Welding
Vol. 53, Issue 3, Pages: 91-100(2023)
Received：10 February 2023，

Published：20 March 2023
DOI： 10.7512/j.issn.1001-2303.2023.03.11
稿件说明：

移动端阅览

宿浩，李雪，赵庆桢，等.搅拌针偏移量对铝/铜异质金属搅拌摩擦焊接过程和接头组织性能的影响［J］.电焊机，2023，53（3）：91-100. DOI： 10.7512/j.issn.1001-2303.2023.03.11.

SU Hao, LI Xue, ZHAO Qingzhen, et al.Effect of Pin Offset on Welding Process, Joint Microstructure and Mechanical Property in Al/Cu Dissimilar Friction Stir Welding[J].Electric Welding Machine, 2023, 53(3): 91-100. DOI： 10.7512/j.issn.1001-2303.2023.03.11.

摘要

采用搅拌摩擦焊接技术对2 mm厚6061铝合金和紫铜合金异质金属进行对接试验，研究搅拌针偏移量对铝/铜异质金属接头组织和性能的影响。研究发现，由于铝和铜两种材料的流动性存在差异，随着搅拌针由铝侧向铜侧偏移，搅拌头-工件界面的温度无明显变化，而焊接过程中的前进阻力显著增大，且接头机械互锁程度也更加充分。对铝/铜异质接头微观形貌进行扫描电子显微镜分析，发现铝/铜界面处的金属间化合物层呈清晰的双层结构，分别为靠近铝侧的Al

Cu层和靠近铜侧的Al

层，此外金属间化合物还以颗粒状和条带状等形貌分布在铝/铜界面附近。搅拌针偏向铜侧0.5 mm时得到的铝/铜异质接头机械互锁程度和金属间化合物分布最为理想，接头抗拉强度达到200 MPa。

Abstract

Dissimilar alloys of 6061 aluminum and T2 copper with thickness of 2 mm were butt joined by utilizing friction stir welding (FSW) to investigate the effect of pin offset values on microstructure and mechanical property of the Al/Cu joints. It was found that the temperature at the tool-workpiece interface was kept relatively stable

but the transverse force was increased gradually

and the material interlocking of dissimilar Al/Cu was also enhanced with the pin offsetting from Al side to Cu side

which was because of the dissimilar material flow characteristics between Al and Cu. The Scanning Electron Microscopy (SEM) analysis were performed on the microstructure of dissimilar Al/Cu FSW joints

it was demonstrated that the Intermetallic Compounds (IMCs) at the Al/Cu joining i

nterface were distinct two-layers structure

which was Al

Cu layer at Al side and the Al

layer at Cu side

and the IMCs were also distributed with various structures with both granular and banded shapes near the Al/Cu interface. The optimal material interlocking and IMCs distribution of Al/Cu FSW joint were achieved with pin offsetting 0.5 mm to Cu side

and the maximum Al/Cu joint tensile strength was 200 MPa.

关键词

Keywords

references

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