MATERIALS AND SUSTAINABLE DEVELOPMENT:GREEN MANUFACTURING AND PROCESSING OF MATERIALS |
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Research Progress of Ultrasonic Spot Welding of Metals |
PENG He1, CHEN Daolun2, JIANG Xianquan3,4, BAI Xuefei1
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1 College of Engineering Technology, Southwest University, Chongqing 400715, China 2 Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, ON M5B 2K3, Canada 3 College of Materials and Energy, Southwest University, Chongqing 400715, China 4 Center of New Material Science and Technology Research Institute, Chongqing 400715, China |
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Abstract Ultrasonic spot welding, as a solid-state welding technique, has attracted the attention of scientists and industry owing to its superiority of small affected zone, high welding strength, low energy consumption and excellent electrical conductivity of joints. However, this technique also has some obvious defects. With the workpiece thickness and hardness increasing, the welding system will become unstable and require greater surface grip and welding power. On the other hand, when conducting a dissimilar welding, the interfacial mechanical properties are susceptible to the generation of intermetallic compounds by interfacial diffusion. In the past few years, researchers attempted to develop the ultrasonic spot welding technique mainly by optimizing welding tools to improve the surface grip, creating high power ultrasonic spot welding equipment to improve stability, deeply studying welding bonding mechanism, and implanting intermediate layer to inhibit the diffusion layer. Up to today, high power ultrasonic spot welding has become the research focus and the object of the research has changed from wire and foil to sheet with a certain thickness and hardness. The key research issues include optimization of welding tooth profile, resistance heat assisted ultrasonic welding, ultrasonic softening theory and microwelds expansion theory, the strengthening mechanism of intermediate layer, etc. A series of achievements help enhance the mechanical properties of ultrasonic joints and further the industrial application of this technique. This review on ultrasonic spot welding technique mainly includes the principle and characteristics of ultrasonic spot welding, the optimization and improvement of welding tools, the bonding mechanism of welding interface, the simulation of welding interface temperature, and the process, structure and performance of welding.
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Published: 13 May 2020
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Fund:This work was financially supported by the National Natural Science Foundation of China (51971183), Fundamental Research Funds for the Central Universities (XDJK2018B108), and Venture and Innovation Support Program for Chongqing Overseas Returnees (CX2018082). |
About author:: He Peng, lecturer, received his Ph.D. from Southwest University in 2019. His current research focuses on ultrasonic spot welding and has published 5 SCI/EI indexed journal papers in this field. Xianquan Jiang is a second-level professor and doctoral supervisor in the School of Materials and Energy, Southwest University. He received his Master's degree from the Central South University of Technology, in 1992, and Ph.D. from Sichuan University, in 2006. He has published 75 papers on journals including Electrochimica Acta, Journal of Alloys and Compounds, Materials and Design, Materials Science & Engineering, etc., in which 51 are indexed by SCI or EI. Daolun Chen is a professor in the Department of Mechanical and Industrial Engineering, Ryerson University, Toronto. He received his PhD from the Institute of Metal Research, Chinese Academy of Sciences, 1989, and Dr.rer.nat. from the University of Vienna, Austria, 1993. Dr. Chen has published 385 refereed journal (305) and conference (80) papers in the area of advanced materials and key engineering materials, and their deformation, fatigue, welding and joining, plus 190+ non-refereed conference papers/research reports. |
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