The development of strong metal to polymer assemblies is currently an important research subject thanks to its prominence to develop lightweight structures. Furthermore, laser welding is known to be a fast, reliable, and versatile joining process, and it was demonstrated recently that it can be applied to such metal to polymer systems. To enhance the mechanical properties of the laser-joined aluminum-polyamide (Al-PA) specimens, laser polishing and laser ablation processes have been implemented on the aluminum surface before joining. The polyamide surface was also treated with the laser beam, separately. The surfaces were tested by several characterization techniques before and after each surface treatment. Then aluminum and polyamide samples with different surface treatments have been joined with an identical laser joining process. The mechanical properties of the joints in single lap shear configuration are reported and the failure mechanisms are discussed based on micro-computed x-ray tomography imaging of joined specimens and microscopic analysis before failure. Results show that both surface treatments of aluminum significantly improve the shear load of the joint; however, with different failure mechanisms. Polyamide surface treatment and increasing degree of crystallinity are effective when combined with the laser polishing of the Al surface. This combination is responsible for further enhancement of the shear load of the joint to the limit of base metal strength which is approximately 60 % improvement compared to the untreated samples. Finally, energy dispersive X-ray mapping shows the physicochemical bonding between aluminum oxide and polyamide at the interface.

由于其在开发轻质结构方面的突出地位，强金属到聚合物组件的开发目前是一个重要的研究课题。此外，众所周知，激光焊接是一种快速、可靠且通用的连接工艺，并且最近证明它可以应用于此类金属到聚合物系统。为了提高激光连接的铝-聚酰胺 (Al-PA) 试样的机械性能，在连接前对铝表面实施了激光抛光和激光烧蚀工艺。聚酰胺表面也单独用激光束处理。在每次表面处理之前和之后，通过几种表征技术测试表面。然后使用相同的激光连接工艺连接具有不同表面处理的铝和聚酰胺样品。报告了单搭接剪切配置中接头的机械性能，并基于连接试样的微型计算机 X 射线断层扫描成像和失效前的显微分析讨论了失效机制。结果表明，铝的两种表面处理都显着提高了接头的剪切载荷；但是，具有不同的故障机制。聚酰胺表面处理和提高结晶度与铝表面的激光抛光相结合是有效的。这种组合有助于将接头的剪切载荷进一步提高到母材强度的极限，与未处理的样品相比，提高了约 60%。最后，能量色散 X 射线图显示氧化铝和聚酰胺在界面处的物理化学键合。