Spot overlapping acts as one of the main concerns in getting ideal results in the laser paint stripping operations. In order to describe the process of paint removal with repetitively pulsed lasers in a scanning scheme, a simplified three-dimensional numerical model is developed and demonstrated to be able to present paint stripping results obtained with movable laser pulses. The influences of spatial overlapping between neighboring pulsed laser spots on the thermal distribution and on the corresponding paint removal are discussed. A series of experiments is designed, and the results agree well with the numerical simulation. It is found that a spot overlapping ratio higher than 50% is able to give uniformly heated zones and hence leads to no paint residues within the stripped region. An experimental linear dependence of laser paint stripping depth on the incident laser energy density is also obtained and may provide a guide for the parameter selection in the laser paint removal operations.

中文翻译：

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移动重复脉冲激光脱漆光斑重叠的影响

点重叠是在激光脱漆操作中获得理想结果的主要问题之一。为了描述在扫描方案中使用重复脉冲激光去除油漆的过程，开发了一个简化的三维数值模型并证明其能够呈现使用可移动激光脉冲获得的油漆剥离结果。讨论了相邻脉冲激光点之间空间重叠对热分布和相应油漆去除的影响。设计了一系列实验，结果与数值模拟吻合较好。发现高于 50% 的点重叠率能够提供均匀加热的区域，因此在剥离区域内没有油漆残留。