Removal characteristics of shop-primer paint by laser energy density in Q-switching fiber laser cleaning

Kim, Ji-Eon; Han, Myoung-Soo; Kim, Jong-Do

doi:10.1142/s0217984920400424

Cited by 9 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to above results, it can be concluded that the safe power intensity for the cleaning of ductile iron substrate is about 320 W, corresponding to 10.86 J/cm 2 (1.086 × 10 8 W/cm 2 ), which is close to the calculated result. According to literatures [10,[23][24][25], the thick surface layer can be completely removed by increasing cleaning times. us, in following experiments, average laser power is adjusted to 320 W and other parameters are kept the same with prior experiments.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Cleaning of Graphite Particles Embedded in the Surface of Ductile Iron by Using a Novel Method

Jia

Miao

Jiang

et al. 2021

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Ductile iron has unique mechanical property and has been widely used in many industrial applications, e.g., engine cylinder covers, crank axles, and machine tool beds and cams. The welding performance of ductile iron is normally influenced by graphite particles in the surface of ductile iron, which needs to be removed before welding. In this article, laser cleaning technique was developed to remove graphite particles implanted in the surface of ductile iron. Laser cleaning parameters and the damage threshold value of the substrate were investigated by using a pulsed Nd: YAG laser. The optimized laser cleaning parameters were obtained to achieve high-quality cleaning effect and avoid the formation of the oxide layer. Surface morphologies and elemental compositions of specimens before and after laser cleaning were characterized by scanning electron microscopy and energy-dispersive X-ray spectroscopy. Results indicated that graphite particles implanted in the surface of ductile iron were removed completely and efficiently by using the pulsed laser without the protection of inert gas atmosphere, and surface oxidation was not observed during the laser cleaning process.

show abstract

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Cleaning of Graphite Particles Embedded in the Surface of Ductile Iron by Using a Novel Method

Jia

Miao

Jiang

et al. 2021

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…Zapka W. et al [14] conducted the laser-induced removal of particles from surfaces with different laser wavelengths. Harris C. D. et al and Kim J. E. [15,16] studied and verified the removal mechanism of laser cleaning via laser cleaning experiments conducted on metallic surface oxide. Lu Y. F. et al [17,18] characterized the ejected particles during laser cleaning using the recently developed "steam laser cleaning" method.…”

Section: Introductionmentioning

confidence: 99%

Study on the Surface Morphology of Micro-Particles and the Oxide Layer on Silicon Carbide Crystal Using Nanosecond Green Laser Cleaning Assisted with Airflow

Xiao

Zhang

et al. 2022

Crystals

View full text Add to dashboard Cite

With a focus on the particle pollutants on the surface of silicon carbide crystal materials, this paper establishes a laser cleaning model for the fine particles found in silicon carbide crystal materials and proposes a new nanosecond green laser cleaning method assisted by airflow, which can effectively remove microparticles and the oxide layer on the substrate surface. Abaqus software and ANSYS Fluent software were used to simulate changes in the cleaning temperature field and the distribution of particles and dust during cleaning simulation, respectively. Based on the experimental research, and by using a nanosecond green laser to produce a wavelength of 532 nm, the direct irradiation of a nanosecond green laser on the surface of the element, and the particle contaminants on the surface of the silicon carbide material, optimized the process parameters to achieve a better cleaning efficiency. A green laser was used as a light source to conduct experiments to control the wind force of the gas chamber. The influence of the laser energy, scanning speed, and other parameters on the final cleaning efficiency was studied. The parameters of the silicon carbide before and after cleaning were characterized. The research shows that laser cleaning assisted with airflow is an efficient cleaning method that can be used to clean microparticles without damaging silicon carbide crystal substrate and to reduce the surface roughness of silicon carbide material from 1.63 to 0.34 μm, with an airflow of 0.2 Mpa.

show abstract

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Kim

Lee²,

Hyun

et al. 2021

Coatings

Self Cite

View full text Add to dashboard Cite

Shipyards are very interested in improving their working environment and resolving environmental pollution issues by replacing mechanical cleaning technologies used before and after painting processes with laser cleaning technology. Because epoxy paint is thickly coated, with a thickness of 200 μm or greater, it is difficult to remove using both laser cleaning and mechanical cleaning technologies. Therefore, this study tried to obtain effective cleaning results by controlling the process parameters when removing the thick epoxy coating using a Q-switching fiber laser cleaning system with an average power of 100 W developed by our research team. The pulse duration time of the laser is 150 ns. Additionally, in order to determine whether the cleaning was sufficient, the difference in laser-induced plume/plasma was compared. By controlling the beam scanning patterns, line overlap rate, and pulse overlap rate, it was possible to obtain effective cleaning results without introducing removal deviation. In addition, the NOP increased when the laser beam overlap rate increased. This increased the amount of heat input to the material and reduced the number of scans required to remove the epoxy paint. As a result of the plume/plasma analysis, less plume/plasma was generated as the paint was removed if the epoxy paint remained on the surface. On the other hand, when all of the paint was removed, a higher brightness of plume/plasma generated by evaporation of the bare metal was observed.

show abstract

Removal characteristics of shop-primer paint by laser energy density in Q-switching fiber laser cleaning

Cited by 9 publications

References 1 publication

Cleaning of Graphite Particles Embedded in the Surface of Ductile Iron by Using a Novel Method

Cleaning of Graphite Particles Embedded in the Surface of Ductile Iron by Using a Novel Method

Study on the Surface Morphology of Micro-Particles and the Oxide Layer on Silicon Carbide Crystal Using Nanosecond Green Laser Cleaning Assisted with Airflow

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

Contact Info

Product

Resources

About