针对水下激光成孔存在的缺陷, 用超声辅助水下激光成孔的工艺方法对不锈钢进行打孔, 分析了激光脉冲能量、水层厚度、超声功率对成孔三维形貌、孔径和孔深的影响; 对比分析了有无超声辅助水下激光成孔三维形貌和SEM图像。结果表明, 超声场辅助水下激光成孔工艺下, 孔口形状、孔壁粗糙度改善, 熔渣沉积减少, 成孔质量比较好。随着激光脉冲能量、超声功率的增大孔的深度和直径也随之增大, 孔锥度减小; 随着水层厚度的增加孔的深度和直径先增大后减小, 在水层厚度为3 mm处的孔直径最接近于孔深; 有超声辅助时孔的形貌明显好于无超声时孔的形貌。

Aiming at reducing the defects generated of laser drilling underwater, The process of laser drilling underwater on the stainless steel surface with ultrasonic assistance was presented. The impact of laser pulse energy, water layer thickness, ultrasonic power on three-dimensional morphology, Orifice diameter and depth of the hole has been analyzed. Three-dimensional morphology and SEM images of laser drilling underwater with or without ultrasonic has been analyzed. The results suggest that Orifice shape and hole wall roughness was improved and slag deposition was reduced, The hole quality was improved significantly. Orifice diameter and depth of the hole increase with the ultrasonic power and the average laser pulse energy, while the taper reduces. With increase of water layer thickness, Orifice diameter and depth of the hole increase first and then decrease. Morphology of the hole with ultrasonic was better than without ultrasonic.