Effect of Post-Weld Cold Rolling on Microstructure and Properties of Al-Cu Dissimilar FSW Joints

DENG Qinghong; LIU Xiaodong; SHEN Yanjin; YANG Shengping; TAN Wang; FU Ruidong

doi:10.7512/j.issn.1001-2303.2026.07.11

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Effect of Post-Weld Cold Rolling on Microstructure and Properties of Al-Cu Dissimilar FSW Joints
Vol. 56, Issue 7, Pages: 88-93(2026)
Received：07 October 2025，

Revised：2026-04-08，

Published：20 July 2026
DOI： 10.7512/j.issn.1001-2303.2026.07.11
稿件说明：

移动端阅览

邓清洪，刘晓东，沈言锦，等.焊后冷轧对Al-Cu异质FSW接头组织及性能的影响［J］.电焊机，2026，56（7）：88-93. DOI： 10.7512/j.issn.1001-2303.2026.07.11.

DENG Qinghong, LIU Xiaodong, SHEN Yanjin, et al.Effect of Post-Weld Cold Rolling on Microstructure and Properties of Al-Cu Dissimilar FSW Joints[J].Electric Welding Machine, 2026, 56(7): 88-93. DOI： 10.7512/j.issn.1001-2303.2026.07.11.

摘要

铝-铜异种金属搅拌摩擦焊接头在电力与电子工业中应用前景广阔，但其界面处易生成的脆性金属间化合物层严重制约接头性能。为突破此瓶颈，本文提出采用焊后冷轧工艺对铝-铜搅拌摩擦焊接头进行改性。系统研究了冷轧处理对接头微观组织、显微硬度、拉伸性能及断裂行为的影响规律。研究结果表明：焊后冷轧使接头厚度由3 mm成功减薄至0.3 mm，并促使界面处的金属间化合物层发生断裂，有效缓解了其连续分布所导致的不利影响；同时，冷轧变形显著提升了接头各区域的显微硬度，并使接头的抗拉强度从焊态的80 MPa大幅提升至385 MPa，断裂位置由铝-铜界面转移至铝侧。研究结果表明焊后冷轧是一种能够显著提升铝-铜异种金属FSW接头力学性能的有效方法。

Abstract

Al-Cu dissimilar friction stir welding joints hold significant promise for applications in the electrical and electronic industries. However

their performance is often severely limited by the brittle intermetallic compound layer formed at the interface. To address this challenge

this study introduces post-weld cold rolling as a modification technique for Al-Cu friction stir welding joints. The effects of cold rolling on the microstructural evolution

microhardness distribution

tensile properties

and fracture behavior of the joints were systematically investigated. The results demonstrate that post-weld cold rolling successfully reduced the joint thickness from 3 mm to 0.3 mm. Crucially

the rolling process fractured the continuous brittle intermetallic compound layer at the interface

mitigating its detrimental effects. Furthermore

cold rolling significantly increased the microhardness across all regions of the joint and remarkably enhanced the ultimate tensile strength from 80 MPa in the as-welded state to 385 MPa. The fracture location shifted from the Al-Cu interface to the aluminum side. This work confirms that post-weld cold rolling is an effective method for significantly improving the mechanical properties of Al-Cu dissimilar FSW joints.

关键词

Keywords

references

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