文献类型：期刊文献

英文题名：Effect of Laser Power on Porosity and Cracks of Al/Cu Joint

作者：Zhao, Zengye Li, Juan Su, Xiangdong

第一作者：Zhao, Zengye

通信作者：Su, XD[1];Li, J[2]

机构：[1]Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China;[2]Guizhou Inst Technol, Key Lab Light Met Mat Proc Technol Guizhou Prov, Guiyang 550003, Peoples R China

第一机构：Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China;corresponding author), Guizhou Inst Technol, Key Lab Light Met Mat Proc Technol Guizhou Prov, Guiyang 550003, Peoples R China.|贵州理工学院;

年份：2025

外文期刊名：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE

收录：;EI(收录号：20254119295338);WOS:【SCI-EXPANDED(收录号:WOS:001587457800001)】；

基金：This research was supported by the Guizhou Province Youth Science and Technology Talent Support Project, Natural Science Project of Guizhou Provincial Education Department (Qian jiaoji (2023) 078) and the Guizhou Science and Technology Support Program (Qianke He Zhicheng DXGA [2025] Yiban 004) and Science and Technology Plan Project of Guizhou Province (Qianke He Rencai XKBF[2025]008).

语种：英文

外文关键词：Al/Cu dissimilar joint; crack; laser welding; mechanical properties; porosity

摘要：The welding of dissimilar materials, particularly copper (Cu) and aluminum (Al) alloys, has attracted significant attention in various electrical and electronic fields. However, due to the considerable differences in the physical and chemical properties of these materials, welded joints often exhibit defects and brittle intermetallic compounds (IMCs) that compromise joint performance. This study experimentally investigates the effect of laser power variation on the formation of pores and cracks in Al/Cu lap joints. The results indicate that increasing laser power reduces keyhole stability and enhances crack susceptibility. The porosity rate exhibits a nonlinear increase, rising from 1.36% at 650 W to 4.05% at 750 W. The crack length continuously increases, with rapid growth in the initial stage, where the crack propagation rate caused by pores reaches 101.3%, and the solidification crack propagation rate reaches as high as 863%. However, in subsequent stages, the growth rates decrease to 34.4% and 7.8%, respectively. This is attributed to the reduced solidification rate, which facilitates the backfilling process and diminishes the likelihood of crack initiation and secondary cracking. Tensile-shear tests reveal that the fracture surfaces exhibit typical brittle cleavage fracture characteristics, predominantly traversing the Al2Cu phase, eutectic structure, and Al4Cu9 phase. By optimizing key process parameters, it is possible to effectively reduce the porosity and crack rates in the weld. This study provides a theoretical foundation and practical guidance for optimizing laser welding process parameters for dissimilar aluminum/copper metals, aiming to reduce defects and enhance welding reliability, thereby laying the groundwork for industrial applications.