Surface preparation is a critical process in the re-painting of steel bridges wherein the grinding or blasting method has been widely used to remove coating and rust off steel surfaces. However, these methods struggle with rust removal in narrow areas, causing environmental problems such as dust scattering, and noise. In order to solve these problems, surface preparation, using a laser, has been researched and developed. In this study, we investigated the applicability of the clean laser system to the surface preparation of steel, experimentally, and analytically. The coating and rust removal experiments, using the clean laser system were performed with two types of specimens, both employing different coating systems. Furthermore, the coating thickness, surface observation using a microscope, and adhesion test were investigated during the tests. Subsequently, the thermal finite element analysis was performed under the same conditions as that of the experiments. It was revealed that the optimal condition for coating and rust removal was determined by the laser power, pulse width, scan width, and scan speed.

表面准备是钢桥重涂的关键过程，其中，研磨或喷砂方法已被广泛用于去除钢表面的涂层和生锈。然而，这些方法在狭窄区域中难以除锈，从而引起环境问题，例如灰尘散布和噪音。为了解决这些问题，已经研究和开发了使用激光的表面处理。在这项研究中，我们通过实验和分析方法研究了清洁激光系统在钢表面处理中的适用性。使用清洁激光系统对两种类型的样品进行了涂层和除锈实验，两种样品均采用不同的涂层系统。此外，在测试过程中研究了涂层的厚度，使用显微镜的表面观察以及粘附力测试。随后，在与实验相同的条件下进行热有限元分析。结果表明，涂​​层和除锈的最佳条件取决于激光功率，脉冲宽度，扫描宽度和扫描速度。