Heat affected zone (HAZ) is one of the key factors in evaluating quality in laser processing of carbon fiber reinforced polymer (CFRP). To achieve a systematic and quantitative description of continuous wave (CW) and pulsed wave (PW) laser ablation of CFRP, dimensional analysis was applied to establish the HAZ extension models. The HAZ morphology and fracture microstructure were characterized, and the characteristics of the ablation plume and gas diffusion were observed. The HAZ extension models show good prediction effect on HAZ and the key dimensionless numbers that determine the HAZ are found. Relating the dimensionless numbers to the HAZ extension characteristics provides a quantitative optimization direction for avoiding excessive ablation. Differences in the heat accumulation process of CW laser and PW laser ablation are concluded, which lead to complex comprehensive effect among the parameters. The resulting differences in the effects of CW and PW laser parameters on the HAZ are comparatively studied. PW laser ablation under the parameters of high repetitive frequency and low scanning speed is found to exhibit the properties of CW laser in the HAZ extension characteristics including size and morphology.

中文翻译：

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基于量纲分析的CFRP激光烧蚀HAZ扩展特性研究

热影响区（HAZ）是评估碳纤维增强聚合物（CFRP）激光加工质量的关键因素之一。为了系统、定量地描述 CFRP 的连续波 (CW) 和脉冲波 (PW) 激光烧蚀，采用尺寸分析来建立 HAZ 扩展模型。对HAZ形貌和断口微观结构进行了表征，观察了烧蚀羽流和气体扩散特征。HAZ扩展模型对HAZ具有良好的预测效果，并找到了决定HAZ的关键无量纲数。将无量纲数与热影响区延伸特性联系起来，为避免过度烧蚀提供了定量的优化方向。总结出连续激光和PW激光烧蚀的热量积累过程存在差异，导致参数之间的综合影响复杂。对由此产生的 CW 和 PW 激光参数对 HAZ 影响的差异进行了比较研究。研究发现，在高重复频率和低扫描速度参数下，PW 激光烧蚀在 HAZ 延伸特性（包括尺寸和形貌）方面表现出 CW 激光的特性。