This study investigates the fatigue behaviour of overlap laser-welded 1.6 mm thick AA5052-H36 sheets. The oscillation beam laser welding in continuous mode is adopted for preparing defect-free weld seams. Three different stitch-weld orientations (transversal, longitudinal, and diagonal with respect to the load direction, denoted in the present work A, B, and F, respectively) coupled with two different part-to-part gap values (in contact and out-of-range gaps, denoted G00 and G05, respectively) are considered. The vertical configuration showed the highest fatigue resistance and repeatability as well as the highest resistance to crack propagation and the most secure fracture pattern. Finally, the gap decreased the fatigue life in a range of 5 to 20 % depending on the applied load and the stitch-weld orientation.

本研究调查重叠激光焊接 1.6 毫米厚 AA5052-H36 板材的疲劳行为。采用连续模式的振荡束激光焊接制备无缺陷焊缝。三种不同的缝焊方向（横向、纵向和相对于负载方向的对角线，分别在当前工作 A、B 和 F 中表示）加上两个不同的零件间间隙值（接触和向外）范围间隙，分别表示为 G00 和 G05）。垂直配置显示出最高的抗疲劳性和可重复性，以及最高的裂纹扩展阻力和最安全的断裂模式。最后，根据施加的载荷和缝焊方向，间隙会使疲劳寿命降低 5% 到 20%。