Abstract: The purpose of this paper was to investigate the influences of key processing parameters of water jet guided laser processing on the groovess cross-sectional morphology and heat affected zones of CFRPs. Therefore, based on the water jet guided laser processing equipment, a single factor experiment was designed to explore the effects of multiple key processing parameters, including laser power, water jet pressure, feed speed and laser repetition frequency. On this grooving experiment, the morphology of the groove sections and the formation mechanism of the heat affected zones were also analyzed. The following experimental results show that: the laser power has the greatest influences on the groove ablation depths and heat affected zones; the water jet pressure has the greatest influences on the groove ablation width; feed speed and laser repetition frequency has little effects on the groove ablation depth and ablation width, but has great effects on the heat affected zones. In addition, it is found that the removal area of groove cross sections displays V shape, and the heat affected zones are in the shape of sawtooth. A better groove section morphology is obtained by single factor analysis, the ablation depth and ablation width are as 772.8 μm and 894.7 μm, respectively. The heat affected zones of the carbon fiber layers is as 326.5 μm for the direction of 90° and 102.4 μm for the direction of 0°.

Key words: carbon fiber reinforced plastic(CFRP), water jet guided laser processing, groove section morphology, heat affected zone

摘要： 为了研究水导激光加工关键工艺参数对碳纤维增强复合材料（CFRP）沟槽截面形貌与热影响区的影响，利用水导激光加工设备设计单因素实验探究了激光功率、水射流压力、进给速度及激光重复频率四个关键工艺参数对沟槽截面形貌以及热影响区的影响规律,分析了沟槽截面形貌和热影响区形成机理。实验结果表明：激光功率对沟槽烧蚀深度和热影响区的影响最大，水射流压力对沟槽烧蚀宽度的影响最大，进给速度和激光重复频率对沟槽烧蚀深度和宽度的影响不大，对热影响区有较大影响。此外，发现沟槽截面去除区呈V字形，热影响区呈锯齿形状。通过单因素方法分析得到了较好的沟槽截面形貌，其沟槽截面烧蚀深度为772.8 μm，烧蚀宽度为897.7 μm，铺设方向为90°的碳纤维层热影响区为326.5 μm，铺设方向为0°的碳纤维层热影响区为102.4 μm。

关键词: 碳纤维增强复合材料, 水导激光加工, 沟槽截面形貌, 热影响区