ABSTRACT An experimental investigation on the joining process of 6061 aluminum alloy and carbon fiber reinforced thermoplastics composite (CFRTP) has been carried out with swing laser. The application of the swing laser is beneficial to obtain a larger bonding area. The effects of scanning speed are investigated on the interface formation and fracture load of the hybrid joint. In addition, the formation mechanism of the interface and the fracture mode of the hybrid joint are further elucidated. The results indicate that maximum failure load is obtained with appropriate process parameters (scanning speed: 20 mm/s, laser power: 2000 W), whereas the interface morphology under this process parameter demonstrates that the structurally sound connection between CFRTP and aluminum alloy is realized by the mechanical interlocking effect. At a higher scanning speed, the gaps in the interface caused by insufficient heat input per unit length result in a lower failure load, while at a lower scanning speed, the bubbles and gaps at the interface are observed as a result of resin decomposition and trapped pyrolysis gases in the interface, ultimately reducing the failure load of the joint. Moreover, the fracture mode of the hybrid joint is a mixed failure.

中文翻译：

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CFRTP与铝合金激光接合工艺研究

摘要 利用摆动激光对 6061 铝合金与碳纤维增强热塑性塑料复合材料 (CFRTP) 的接合工艺进行了实验研究。摆动激光的应用有利于获得更大的键合面积。研究了扫描速度对混合接头界面形成和断裂载荷的影响。此外，进一步阐明了界面的形成机制和混合接头的断裂模式。结果表明，在适当的工艺参数（扫描速度：20 mm/s，激光功率：2000 W）下获得最大破坏载荷，而该工艺参数下的界面形态表明，CFRTP 与铝合金之间实现了结构良好的连接通过机械联锁作用。在较高的扫描速度下，由于单位长度的热量输入不足而导致的界面间隙导致较低的失效载荷，而在较低的扫描速度下，由于树脂分解和捕获而观察到界面处的气泡和间隙界面中的热解气体，最终降低接头的失效载荷。此外，混合接头的断裂模式是混合失效。