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铜-铝异种箔片纳秒激光扫描点焊成形及组织特征

Formation and Microstructure Characteristics in Spot Welding of Dissimilar Cu-Al Foil by Nanosecond Laser Scanning

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摘要

利用纳秒脉冲激光及光学振镜系统, 对T2铜及1060铝合金箔片进行螺旋形点焊, 分析不同搭接组合形式下的焊点成形及组织特征。结果表明:当搭接组合形式为铝上铜下时, 铝侧金属完全熔化, 部分区域中铝侵入铜母材形成“V”型微小焊缝; 当搭接组合形式为铜上铝下时, 焊缝由具有较大深宽比的微小焊缝组成。两种搭接组合形式下, 焊缝的组织中形成了γ2-Cu9Al4区域、过共晶组织区、共晶组织区及亚共晶组织区。接头界面处的CuAl2金属间化合物层较薄, 并未发现明显的微观裂纹, 接头的脆性可显著改善。

Abstract

The T2 copper and 1060 aluminum alloy foil are spiral spot welded by a nanosecond laser and the galvanometer system. The weld formation and the microstructures under different overlapping combination modes are analyzed. The results show that for the overlapping combination mode in which aluminum is on the top of copper, the metal on the aluminum side is completely melted, and in some areas, aluminum penetrates into the copper substrate and the “V” shaped tiny welds are formed. In contrast for the overlapping combination mode in which copper is on the top of aluminum, the weld is composed of tiny welds with high aspect ratios. Under these two overlapping combination modes, there exist four typical areas of γ2-Cu9Al4, hypereutectic structure, eutectic structure, and hypo eutectic structure within the microstructure of welds. The CuAl2 intermetallic compound layer is thin and no obvious cracks are found at the joint interface. The brittleness of joints is obviously improved.

Newport宣传-MKS新实验室计划
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中图分类号:TG456.7

DOI:10.3788/CJL201946.0402006

所属栏目:激光制造

基金项目:国家自然科学基金(51605276)、上海市“创新行动计划”基础研究领域项目(17JC1400600, 17JC1400601)

收稿日期:2018-11-08

修改稿日期:2018-11-30

网络出版日期:2019-01-08

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吴希:上海工程技术大学材料工程学院, 上海 201620
张培磊:上海工程技术大学材料工程学院, 上海 201620上海市激光先进制造技术协同创新中心, 上海 201620
唐满:上海工程技术大学材料工程学院, 上海 201620
李明川:上海工程技术大学材料工程学院, 上海 201620
于治水:上海工程技术大学材料工程学院, 上海 201620上海市激光先进制造技术协同创新中心, 上海 201620
李绍伟:上海工程技术大学材料工程学院, 上海 201620上海市激光先进制造技术协同创新中心, 上海 201620

联系人作者:张培磊(peilei@sues.edu.cn)

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引用该论文

Wu Xi,Zhang Peilei,Tang Man,Li Mingchuan,Yu Zhishui,Li Shaowei. Formation and Microstructure Characteristics in Spot Welding of Dissimilar Cu-Al Foil by Nanosecond Laser Scanning[J]. Chinese Journal of Lasers, 2019, 46(4): 0402006

吴希,张培磊,唐满,李明川,于治水,李绍伟. 铜-铝异种箔片纳秒激光扫描点焊成形及组织特征[J]. 中国激光, 2019, 46(4): 0402006

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