Abstract
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.
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