碳纤维增强热固性复合材料（Carbon Fiber Reinforced Thermalsetting Composites，CFRTS）和TC4钛合金具有较高的比强度和比刚性，轻量化效果十分明显，在航空航天、新能源汽车制造中广泛应用。为实现碳CFRTS与TC4钛合金的高强度连接，本文引入“激光清洗+树脂填充”的界面复合调控工艺。在CFRTS和TC4钛合金激光焊接之前，首先采用脉冲光纤激光器对CFRTS表面进行激光清洗处理，去除表层的环氧树脂，使CFRTS中的碳纤维裸露出来；其次利用脉冲光纤激光器对钛合金表面微织构处理，提升焊接时熔融树脂与TC4钛合金的接触面积并形成“咬合”结构；最后在清洗后的CFRTS和钛合金接触面之间添加合适厚度的聚酰胺（PA）树脂，进行激光辅助焊接。本文研究了激光清洗工艺对接头连接强度的影响，通过不同激光清洗工艺参数下CFRTS的表面形貌、PA树脂填充情况、接头断口形貌的对比分析，结果发现：激光清洗CFRTS可以显著增强CFRTS-TC4钛合金接头的强度，最大剪切强度可达23.77MPa。
Carbon fiber reinforced thermalsetting composites (CFRTS) and TC4 titanium alloy have high specific strength and rigidity, and have obvious lightweight effect, which are widely used in aerospace and new energy automobile manufacturing. In order to realize the high-strength connection between CFRTS and TC4 titanium alloy, this paper introduces the interface compound control process of "laser cleaning + resin filling". In order to expose the carbon fiber in the CFRTS, we use a pulsed fiber laser to laser clean the surface of CFRTS to remove the epoxy resin on the surface before laser welding of CFRTS and TC4 titanium alloy firstly; A pulsed fiber laser is used to process the surface microtexture of the titanium alloy to increase the contact area between the molten resin and the TC4 titanium alloy during welding and form an "occlusal" structure secondly; Finally a suitable thickness of polyamide (PA) resin is added into contact surface of the cleaned CFRTS and the titanium alloy for laser-assisted welding.In this paper, the influence of laser cleaning process on the joint connection strength is studied. This paper studies the influence of laser cleaning process on the joint strength of joints. Through the comparative analysis of CFRTS surface morphology, PA resin filling conditions, and joint fracture morphology under different laser cleaning process parameters, it is found that laser cleaning CFRTS can significantly enhance the strength of CFRTS-TC4 titanium alloy joint, the maximum shear strength can reach 23.77MPa.
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