铝/铜蓝-红激光复合焊接头组织及性能
Microstructure and properties of aluminum/copper blue-red hybrid laser welded joint
史颖杰 1崔泽琴 2丁正祥 3郝晓虎 4王文先 2李卫国5
作者信息
- 1. 太原理工大学, 太原, 030024
- 2. 太原理工大学, 太原, 030024;山西浙大新材料与化工研究院, 太原, 030032
- 3. 中船黄埔文冲船舶有限公司, 广东省舰船先进焊接技术企业重点实验室, 广州, 510715
- 4. 太原理工大学, 太原, 030024;山西浙大新材料与化工研究院, 太原, 030032;中船黄埔文冲船舶有限公司, 广东省舰船先进焊接技术企业重点实验室, 广州, 510715
- 5. 太原理工大学, 工程训练中心, 太原, 030024
- 折叠
摘要
为实现动力电池的高效可靠焊接,文中采用蓝-红复合激光进行了 1050 Al/T2 Cu搭接焊,分析了激光功率对接头显微组织、相分布、力学性能及导电性能的影响规律.结果表明,铝/铜搭接接头焊缝表面平整,截面呈现T形,PB(蓝光功率)保持 300 W,PR(红光功率)在 700～1 400 W区间内增加,铜侧熔深由 60 μm增大到 1 000 μm,在PR = 800 W时实现良好的冶金结合.焊缝组织由Al固溶体、Al-Cu共晶相和Al2Cu金属间化合物组成,随激光功率增大,焊缝局部出现Al4Cu9 相,边缘出现AlCu,Al4Cu9 和AlCu3 相.在PR = 800 W下抗剪强度达到最高108.6 MPa,接触电阻达到最小 94 μΩ,裂纹由两极交界处Al2Cu区域萌生,沿焊缝边缘由外层Al2Cu区扩展到底部Al固溶体和Al-Cu共晶区交界处,断裂形式为解理断裂.
Abstract
In order to realize efficient and reliable welding of power battery,1050 aluminum/T2 copper lap welding was car-ried out by using blue-red laser heat source.The effects of laser power on the microstructure,phase distribution mechanic-al properties and electrical conductivity of the joint were in-vestigated.The results show that the weld surface of Al/Cu lap joint is smooth and the section is"T"shape.When PB(Blue laser power)remains 300 W,PR(Infrared laser power)in-creases in 700 W～1 400 W,the copper side penetration depth increases from 60 μm to 1 000 μm,achieving a good metallur-gical bonding with PR = 800 W.The weld microstructure is composed of Al solid solution,Al-Cu eutectic alloy and Al2Cu intermetallic compound phases.With the increase of laser power,Al4Cu9 phases appear locally in the weld,and AlCu,Al4Cu9 and AlCu3 phases appear at the edge.When PR = 800 W,the weld strength reaches the maximum of 108.6 MPa,and the contact resistance reaches the minimum of 94 μΩ.The crack starts from the junction of two plates region(Al2Cu)and extends along the weld edge from the outer Al2Cu region to the junction of Al solid solution and Al-Cu eutectic alloy at the bottom.The fracture form is cleavage fracture.
关键词
复合激光焊/铝/铜异质材料/界面反应/微观组织/力学性能/导电性Key words
hybrid laser welding/Al/Cu dissimilar materi-al/reaction at interface/micro-structure/mechanical proper-ties/conductivity引用本文复制引用
基金项目
国家自然科学基金青年基金(52105389)
山西省基础研究计划青年科学研究项目(20210302124113)
出版年
2024
NETL
NSTL
万方数据