At present, a reliable and stable laser joining of magnesium alloy and carbon fiber reinforced plastic (CFRP) was difficult to be achieved. The effect of laser power on the performance of the AZ31B/CFRP joints was investigated. The dynamic behavior during the laser joining process was captured by a high-speed camera. The interfacial temperature at the center of the weld was measured. The lap joints by laser joining were fabricated and the fracture surfaces were observed. The chemical bonding at the interface was identified by X-ray photoelectron spectroscopy (XPS). The joining mechanism of the joint with various laser power was clarified. The results showed that the joints were free of the bubbles defects. The shear force of the joint first increased and then decreased as the laser power increased. The maximum shear force was 1714.17 N (about 9 MPa) in the case of 700 W. The interfacial temperature was 390℃. The maximum bonding width of resin and ratio of bonding region to adhesive region were obtained in the case of 700 W, which were 4.45 mm and 88% respectively. The fracture pattern included cohesive fracture and interface fracture. The reinforcing fibers were stretched, indicating the enhancement of the joint strength. A new chemical bonding MgCO₃ existed at the interface, further improving the performance of the joint. The proper laser power could achieve an effective joining between AZ31B and CFRP.

目前，很难实现镁合金和碳纤维增强塑料（CFRP）的可靠稳定的激光连接。研究了激光功率对 AZ31B/CFRP 接头性能的影响。激光连接过程中的动态行为由高速相机捕捉。测量焊缝中心的界面温度。通过激光连接制造搭接接头并观察断裂表面。通过 X 射线光电子能谱 (XPS) 识别界面处的化学键。阐明了各种激光功率下接头的接合机理。结果表明接头没有气泡缺陷。随着激光功率的增加，接头的剪切力先增大后减小。最大剪切力为 1714。在700 W的情况下为17 N（约9 MPa）。界面温度为390℃。在700 W的情况下，树脂的最大粘合宽度和粘合区与粘合区的比例分别为4.45 mm和88%。断裂模式包括内聚断裂和界面断裂。增强纤维被拉伸，表明接头强度增强。一种新的化学键合 MgCO₃存在于界面处，进一步提高了接头的性能。适当的激光功率可以实现 AZ31B 和 CFRP 之间的有效接合。