A Study on the Effect of Overlap Rate on Laser Beam Cleaning Characteristics while Cleaning Paint Using a Low Power Pulsed Laser(Ⅱ) - Analysis of Laser Cleaned Surface Characteristics for Various Pulse Overlap Rates -

Abstract

Laser cleaning technologies have been attracting attention as a solution to the environmental problems caused by pre-treatment processes, but there are very few studies on the removal of paint using laser cleaning. In this study, laser cleaning was performed on steel painted with shop primer and epoxy paint using a Q-switching fiber laser, and the characteristics of the laser cleaned surfaces was compared in relation to the pulse overlap rate, as a main parameter. Experimental results showed that the number of scans to remove the paint decreased as the pulse overlap rate increased. At pulse overlap rates of 20 % and 50 %, the oxide layer was not removed from the surface. However, when the pulse overlap rate was increased to 70%, the oxide layer was completely removed. In addition, damage of the base material was reduced when the pulse overlap rate was increased, more precise laser cleaning was possible.

A Study on the Laser Removal of Epoxy Coatings on SS400 Surface by Beam Scanning Patterns

“…Because it is painted thicker than 200 µm on ships, its removal presents a significant challenge when using both laser cleaning and mechanical cleaning technologies. Before proceeding with this study, our researchers conducted a previous study to remove 200 µm of epoxy paint from the steel surface of ships using a fiber laser cleaning system with an average power of 100 W without a beam scanning pattern function [13][14][15][16][17]. As a result, it was possible to remove the paint from the metal surface, but there remained several problems to be solved in order to expand the cleaning area and obtain effective results.…”

A Fundamental Study on the High-Power Fiber Laser Cleaning for Removing the Multi-Layer Coating

“…Existing studies on coating layer removal primarily consist of research on the removal of a single layer of epoxy paint and primer according to process parameters using a low-power laser with an average power less than 500 W [4][5][6][7][8][9][10] . Moreover, Marimuthu et al extended the use of laser cleaning for paint removal to the removal of various contaminants such as TiN coating, oil, and grease on the surface of a material 11,12) .…”