程晓玲,阮英兰

• 1:南昌理工学院电子与信息学院

摘要(Abstract)：

采用微电阻点焊对0.5 mm厚5052铝合金薄片和0.3 mm厚镀镍钢片进行连接,研究焊接电流对点焊接头成型及其力学性能的影响。结果表明:焊接电流为3.9 kA时,焊点熔核区铝合金液化程度较低,熔核区边界模糊;焊接电流增大至4.2 kA时,焊点成型良好;当焊接电流增大至4.5和4.9 k A时,焊接热输入过大,焊点出现飞溅现象,界面存在缩孔和裂纹缺陷;焊点仅在铝侧形成“钟”型熔核,熔核界面平整,熔核界面两侧存在未熔化的镀Ni层,熔核界面中心为铝-钢界面,经能谱仪(EDS)分析发现界面存在微量的Fe_2Al_5和Fe-Al-Ni相;接头的抗拉剪力随着焊接电流增大呈先增大后减小的趋势,焊接电流为4.2 kA时,接头抗拉剪力最大,为342.1 N,接头沿焊点边缘处撕裂。

关键词(KeyWords)： 铝合金;镀镍钢;微电阻点焊;组织性能

Abstract:

Keywords:

基金项目(Foundation): 江西省教育厅科学技术研究项目(GJJ2402614)

作者(Author): 程晓玲,阮英兰

DOI: 10.13289/j.issn.1009-6264.2025-0156

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