柴森森,余大亮,戴庆伟,兰伟

• 1:重庆科技学院冶金与材料工程学院

摘要(Abstract)：

利用光学显微镜、扫描电镜及能谱分析、拉剪力测试等方法,研究了焊接电流(14～20 kA)、焊接时间(14～20 cycle)和电极压力(1.8～3 kN)对AZ31/AZ80异种镁合金电阻点焊成形性、显微组织及力学性能的影响。结果表明:电阻点焊过程会使原本存在于AZ80母材中的雪花状Mg_(17)Al_(12)相溶解,而轧制层带中的块状Mg_(17)Al_(12)相得以保留。随着焊接电流的增加,搭接接头的最大抗剪力增大,当焊接电流或焊接时间超过一定值时,焊核区以及AZ80侧的热影响区容易出现裂纹,导致焊点拉剪力降低。AZ80热影响区裂纹的产生很可能与未溶解的Mg_(17)Al_(12)相有关。

关键词(KeyWords)： 镁合金;异种金属;电阻点焊;焊接开裂

Abstract:

Keywords:

基金项目(Foundation): 重庆市科技局基础研究项目(cstc2018jcyjAX0607,cstc2019jcyj-msxmX0284);; 重庆市教育委员会科学技术研究项目(KJQN201801523);; 中国博士后科学基金资助项目(2019M653317);; 中国博士后基金(2016T90831,2015M572447);; 重庆英才计划(CQYC201905100)

作者(Author): 柴森森,余大亮,戴庆伟,兰伟

DOI: 10.13289/j.issn.1009-6264.2020-0620

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