Transactions of Materials and Heat Treatment

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

Authors： Zhang Haohan1 Zhu Jianxiong2 3 Zhao Lun2 Xu Fan3 Guo Zixin2 Liu Jiyuan2 Zhang Li1

Unit： 1. Mechanical and Electrical Engineering Faculty Yunnan Open University 2. Institute of Ultrasonic Technology Shenzhen Polytechnic University 3. School of Mechanical Engineering and Automation University of Science and Technology Liaoning

KeyWords： ultrasonic welding 5A06 aluminum alloy self-piercing riveting mechanical property element distribution hardness characteristics of joint

ClassificationCode：TH131.1

year,vol(issue):pagenumber：2024,49(11):94-100

Abstract：

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.

Funds：

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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