Vibration-assisted laser welding experiment of 5052 aluminum alloys was carried out to focus on the influences of vibration parameters on microstructure and fatigue fracture. The experiment found that the vibration process homogenized the microstructure and promoted the formation of fine equiaxed grains significantly. In addition, vibration made the hardness uniform by reducing the area of the fusion zone. Experimental results of double welds showed that residual stress reduced by 58 to 77% under the action of micro-vibration. Vibration frequency and vibration acceleration had significant effects on the longitudinal and transverse residual stress, respectively. Under the same fatigue load condition, the average fatigue limits of the base metal (BM) and the welded joints were 160 and 120 MPa, respectively. Under the conditions of 10⁷ cycles, the maximum fatigue strength of the welded joints has reached 74.95% fatigue strength of the BM. Vibration-assisted laser welding could obviously improve the fatigue performance and increase the fatigue life of the welded joints, which was a potential way to improve the quality of welded joints.

进行了5052铝合金的振动辅助激光焊接实验，重点研究了振动参数对组织和疲劳断裂的影响。实验发现，振动过程使组织均匀化，并促进了细等轴晶粒的形成。另外，振动通过减小熔合区的面积使硬度均匀。双焊缝的实验结果表明，在微振动作用下，残余应力降低了58％至77％。振动频率和振动加速度分别对纵向和横向残余应力有显着影响。在相同的疲劳载荷条件下，母材（BM）和焊接接头的平均疲劳极限分别为160 MPa和120 MPa。在10的条件下⁷个循环，焊接接头的最大疲劳强度已达到BM的74.95％。振动辅助激光焊接可以明显改善焊接接头的疲劳性能，延长其疲劳寿命，是提高焊接接头质量的潜在途径。