This paper investigates the use of multi-walled carbon nanotube/polypropylene (MWCNT/PP) films to enable ultrasonic welding and damage detection of glass fiber/polypropylene (GF/PP) composite joints in a single lap configuration. Three MWCNT concentrations above electrical percolation (15–25 wt%) were chosen to weld GF/PP adherends. The effect of MWCNT content on the welding process was evaluated by comparing weld quality through lap shear strength (LSS) tests and fractography analysis. Films containing 15 and 20 wt% MWCNT had no significant effect on the welding process, while 25 wt% reduced LSS by up to 39% compared to pure PP films due to their brittleness. Welded joints with MWCNT/PP films showed potential for damage detection through real-time electrical resistance changes at the interface. Thus, the multifunctional films proposed in this study represent a novel and promising approach for ultrasonic welding and damage detection of thermoplastic composite joints, but future work should focus on improving weld strength.

本文研究了多壁碳纳米管/聚丙烯（MWCNT / PP）膜的使用，以实现单圈配置的玻璃纤维/聚丙烯（GF / PP）复合接头的超声焊接和损伤检测。选择三个高于电渗滤（15–25 wt％）的MWCNT浓度来焊接GF / PP粘附体。MWCNT含量对焊接工艺的影响通过搭接剪切强度（LSS）测试和X射线断层扫描分析比较焊接质量来评估。含有15和20 wt％MWCNT的薄膜对焊接过程没有显着影响，而与纯PP薄膜相比，由于其脆性，25 wt％的LSS降低了39％。带有MWCNT / PP膜的焊接接头通过界面处的实时电阻变化显示了潜在的损坏检测能力。从而，