A novel seal-flow multi-vortex friction stir lap welding of metal to polymer matrix composites

IF 5.3 1区工程技术 Q1 ENGINEERING, AEROSPACE Chinese Journal of Aeronautics Pub Date : 2024-01-01 DOI:10.1016/j.cja.2023.04.009

Shuaiqiang NIAN , Mingshen LI , Shude JI , Wei HU , Zhiqing ZHANG , Zelin SUN

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Abstract

The friction stir lap welding (FSLW) of metal to polymer is a challenging work due to the unavoidable polymer overflowing. Facing this problem, a novel seal-flow multi-vortex friction stir lap welding (SM-FSLW) technology based on the subversively-designed multi-step pin was put forward. Choosing 7075 aluminum alloy and short glass fiber-reinforced polyether ether ketone (PEEK) as research subjects, the welding temperature, material flow, formation and tensile shear strength of dissimilar materials lap joint under the SM-FSLW were studied and compared with those under traditional FSLW based on the conical pin. The multi-step pin rather than the conical pin effectively hindered the polymer overflowing due to the formation of vortexes by the step, thereby attaining a joint with a smooth surface. Compared with traditional FSLW, the SM-FSLW obtained the higher welding temperature, the more violent material flow and the larger area with high flow velocity, thereby producing the macro-mechanical and micro-mechanical interlockings and then heightening the joint loading capacity. The tensile shear strength of lap joint under SM-FSLW was 27.8% higher than that under traditional FSLW. The SM-FSLW technology using the multi-step pin provides an effective way on obtaining a heterogeneous lap joint of metal to polymer with the excellent formation and high strength.

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一种新型的密封流多涡搅拌摩擦搭接金属-聚合物基复合材料

金属与聚合物的搅拌摩擦搭接焊（FSLW）是一项具有挑战性的工作，因为聚合物溢出是不可避免的。面对这一问题，一种基于颠覆性设计的多阶销钉的新型密封流多涡流搅拌摩擦搭接焊（SM-FSLW）技术应运而生。以 7075 铝合金和短玻璃纤维增强聚醚醚酮（PEEK）为研究对象，研究了 SM-FSLW 焊接温度、材料流动、异种材料搭接接头的成形和拉伸剪切强度，并与基于锥形销钉的传统 FSLW 焊接进行了比较。多级销钉而非锥形销钉有效地阻止了聚合物因阶梯形成的涡流而溢出，从而获得了表面光滑的接头。与传统的全氟焊缝相比，SM-全氟焊缝的焊接温度更高、材料流动更剧烈、流动速度更快、面积更大，从而产生宏观机械和微观机械互锁，进而提高了接头的承载能力。在 SM-FSLW 技术下，搭接接头的拉伸剪切强度比传统 FSLW 高 27.8%。采用多级销钉的 SM-FSLW 技术为获得具有良好成型性和高强度的金属与聚合物异质搭接接头提供了有效途径。

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来源期刊

Chinese Journal of Aeronautics 工程技术-工程：宇航

CiteScore

10.00

自引率

17.50%

发文量

3080

审稿时长

55 days

期刊介绍： Chinese Journal of Aeronautics (CJA) is an open access, peer-reviewed international journal covering all aspects of aerospace engineering. The Journal reports the scientific and technological achievements and frontiers in aeronautic engineering and astronautic engineering, in both theory and practice, such as theoretical research articles, experiment ones, research notes, comprehensive reviews, technological briefs and other reports on the latest developments and everything related to the fields of aeronautics and astronautics, as well as those ground equipment concerned.