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A study on ultrasonic welding of thermoplastics with significant differences in physical properties under different process parameters
Fu, Xie1,2; Yuan, Xiaoya3; Li, Guowei1; Wu, Yutong1; Tong, Hui1; Kang, Shuai1; Luo, Jinling4; Pan, Ziwei4; Lu, Wenqiang1
2022-12-01
摘要Thermoplastics such as polypropylene (PP) and polyamide6 (PA6) with large different physical properties are difficult to welding. The novel ultrasonic welding device introducing the interlayer solder sheet (ISS) and interfacial compatibilization can realize the fusion bonding between PP and PA6. So it is necessary to discuss the influence factors on various process parameters for the mechanical welding performance of these materials. The better weld strength and morphology are related to weld time, weld load, and ISS components. When the process parameters vary in these ranges: welding time: 4-6 s, welding load: 5-7 N, PP-g-MAH contents: 30-70 %, the welding strength shows the better value, while the fracture surface and microstructure of welding interfaces show a perfect welding area with a much more smooth and defect-free uniform microstructure. The ISS with PP-g-MAH contents lower than 50 % has better plasticity, promoting the molecular chain inter-diffusion at the interface, which is beneficial to ultrasonic energy converting to the viscoelastic heat of the material. In addition, too short a weld time (<= 2 s) or load (0-2 N) result in lower weld strength with a small welding area for lower interfacial temperature, while too long a weld time (8 s) leads to defective structures at the weld interface, such as bubbles, holes, etc.
关键词Ultrasonic welding Mechanical properties Microstructure Process parameter Thermoplastics
DOI10.1016/j.mtcomm.2022.105009
发表期刊MATERIALS TODAY COMMUNICATIONS
卷号33页码:10
通讯作者Fu, Xie(fuxie@cigit.ac.cn) ; Lu, Wenqiang(wqlu@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000892583100002
语种英语