锻压技术

超声波焊接对5A06铝合金自冲铆接接头力学行为的影响

英文标题：Influence of ultrasonic welding on mechanical behaviors for 5A06 aluminum alloy self-piercing riveted joint

单位：1.云南开放大学机电工程学院 2.深圳职业技术大学超声技术研究所 3.辽宁科技大学机械工程与自动化学院

分类号：TH131.1

出版年,卷(期):页码：2024,49(11):94-100

摘要：

为了探索超声波焊接对自冲铆接接头力学性能的影响、提升5A06铝合金薄板的连接性能，采用自冲铆接与超声波焊接相结合的方法，通过拉伸实验、扫描电镜、能谱分析及硬度测试，分析接头的力学行为。实验结果显示，超声波焊接显著提高了自冲铆接接头的拉伸强度和韧性。在接头失效模式中，除了常见的拉脱失效，还观察到板材断裂和铆钉断裂的现象。能谱分析结果表明，超声波焊接接头中氧元素含量较低，其他元素分布均匀。此外，接头硬度测试结果显示，经过超声波焊接后，接头硬度峰谷明显降低，表明内部位错促进了塑性流动，增强了接头的延展性和韧性。研究结果表明，超声波焊接是一种有效的提高自冲铆接接头性能的新方法。

In order to explore the influence of ultrasonic welding on the mechanical properties of self-piercing riveted joints and enhance the connection performance of 5A06 aluminum alloy sheets，through combining self-piercing riveting with ultrasonic welding, the mechanical behavior of joints was analyzed by tensile experiment, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and hardness testing. The experimental results indicate that the ultrasonic welding significantly improves the tensile strength and toughness of self-piercing riveted joints. In the failure modes of joints, in addition to the common pull-out failure, the phenomena such as sheet fracture and rivet fracture are observed. EDS analysis results show that the oxygen element content in the ultrasonic welded joints is low, while other elements are evenly distributed. In addition, the hardness testing results of joints reveal that the peak valley of hardness for joints is significantly decreased after ultrasonic welding, indicating that the internal dislocations promotes the plastic flow and enhances the ductility and toughness of joints. The research results demonstrate that the ultrasonic welding is an effective new method to improve the performance of self-piercing riveted joints.

基金项目：

国家自然科学基金资助项目(12104324)；高层次人才科研启动项目(6022310046k)；深职大-新栋力超声波焊接技术研发中心(602331009PQ)；深圳职业技术大学博士后出站后期资助项目(4103-6023271014K1)；云南省教育厅科学研究基金项目(2022J0599)

作者简介：张昊晗（1982-），男，博士，副教授 E-mail：ynouzhh@163.com 通信作者：赵伦（1988-），男，博士，副研究员 E-mail： zhaolun_ultrasonic@126.com

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