scholarly journals A Study on the Application of Laser Cleaning on the Weld of the Gas Fuel Supply Pipe for DF Engine

2021 ◽  
Vol 11 (24) ◽  
pp. 11832
Author(s):  
Ji-Eon Kim ◽  
Pyung-Su Kim ◽  
Jong-Myoung Lee ◽  
Han-Seop Choe ◽  
Jong-Do Kim
Keyword(s):  
Environmental Pollution ◽  
Work Environment ◽  
Process Parameters ◽  
Welding Process ◽  
Laser Cleaning ◽  
Chemical Cleaning ◽  
Fuel Supply ◽  
Before And After ◽  
Gas Fuel ◽  
Cleaning Technology

While producing gas fuel supply pipes for duel fuel (DF) engines, a welding process is essential. Accordingly, specimen management before and after welding is crucial to obtain highly reliable weldments. In this study, we developed an environmentally friendly laser cleaning technology to address a toxic work environment and environmental pollution problems caused by chemical cleaning technology utilized in post-welding treatment of gas fuel supply for DF engines. An experiment was conducted by implementing surface laser cleaning of the butt and fillet weldment specimens according to process parameters. Conditions of process parameters were identified for facilitating laser cleaning and used in prototype production. The prototypes were processed through laser and chemical cleaning, and the quality of the end products was compared. The results indicated that the proposed method satisfactorily cleans the prototype surface without generating a toxic work environment and environmental pollution problems. Moreover, the roughness of approximately 5 μm was achieved on the laser cleaned surface. This is considered to be able to increase the adhesion of the paint compared to the smooth chemical cleaned surface during the painting for anticorrosion of the product.

Corrosion Resistance of Copper Sheet after Laser Treatment

2015 ◽  
Vol 227 ◽  
pp. 167-170 ◽  
Author(s):  
Tomasz Onyszczuk ◽  
Marta Zwolińska ◽  
Marta Mazurkiewicz ◽  
Jan Marczak ◽  
Antoni Sarzyński ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Room Temperature ◽  
Treatment Process ◽  
Laser Cleaning ◽  
Copper Corrosion ◽  
Nacl Solution ◽  
Copper Sheet ◽  
X Ray ◽  
Before And After ◽  
Cleaning Technology

This study concerns laser cleaning technology and its impact on copper corrosion resistances. The results of the treatment process were analyzed after irradiation at various laser powers and scanning velocities of the laser beam. The corrosion resistance of copper sheets, before and after laser irradiation, was examined in an NaCl solution at room temperature. Investigations included surface topography observations using a scanning electron microscope (SEM) together with chemical and phase composition determined by energy dispersive X-ray spectrometry (EDS) and Raman spectroscopy.

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

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1510
Author(s):  
Ji-Eon Kim ◽  
Jong-Myoung Lee ◽  
Jeong-Hun Hyun ◽  
Je-Han Jeong ◽  
Jong-Do Kim
Keyword(s):  
Average Power ◽  
Laser Cleaning ◽  
Working Environment ◽  
Beam Scanning ◽  
Before And After ◽  
The Difference ◽  
Cleaning Technology ◽  
Overlap Rate ◽  
Epoxy Paint ◽  
Mechanical Cleaning

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.

Efficiency of the Inertia Friction Welding Process and Its Dependence on Process Parameters

2017 ◽  
Vol 48 (7) ◽  
pp. 3328-3342 ◽  
Author(s):  
O. N. Senkov ◽  
D. W. Mahaffey ◽  
D. J. Tung ◽  
W. Zhang ◽  
S. L. Semiatin
Keyword(s):  
Process Parameters ◽  
Friction Welding ◽  
Welding Process ◽  
Inertia Friction Welding

scholarly journals Quality assessment of gas produced from different types of biomass pellets in gasification process

2019 ◽  
Vol 38 (2) ◽  
pp. 406-416 ◽  
Author(s):  
Marcel Mikeska ◽  
Jan Najser ◽  
Václav Peer ◽  
Jaroslav Frantík ◽  
Jan Kielar
Keyword(s):  
Gas Turbines ◽  
Combustion Engine ◽  
Calorific Value ◽  
Internal Combustion ◽  
Combustion Gas ◽  
Gas Cleaning ◽  
Gasification Process ◽  
Different Types ◽  
Before And After ◽  
Cleaning Technology

Gas from the gasification of pellets made from renewable sources of energy or from lower-quality fuels often contains a number of pollutants. This may cause technical difficulties during the gas use in internal combustion gas engines used for energy and heat cogeneration. Therefore, an adequate system of gas cleaning must be selected. In line with such requirements, this paper focuses on the characterization and comparison of gases produced from different types of biomass during gasification. The biomass tested was wood, straw, and hay pellets. The paper gives a detailed description and evaluation of the measurements from a fix-bed gasifier for the properties of the produced gases, raw fuels, tar composition, and its particle content before and after the cleaning process. The results of elemental composition, net calorific value, moisture, and ash content show that the cleaned gases are suitable for internal combustion engine-based cogeneration systems, but unsuitable for gas turbines, where a different cleaning technology would be needed.

scholarly journals The Interface Zone of Explosively Welded Titanium/Steel after Short-Term Heat Treatment

2021 ◽  
Author(s):  
Marcin Szmul ◽  
Katarzyna Stan-Glowinska ◽  
Marta Janusz-Skuza ◽  
Agnieszka Bigos ◽  
Andrzej Chudzio ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Intermetallic Phase ◽  
Welding Process ◽  
Carbon Diffusion ◽  
Sharp Interface ◽  
High Plasticity ◽  
Interface Zone ◽  
Before And After ◽  
Wavy Interface ◽  
The Waves

AbstractThis work presents a detailed description of a bonding zone of explosively welded Ti/steel clads subjected to stress relief annealing, applied in order to improve the plasticity of the final product. The typical joint formed by the welding process possesses a characteristic wavy interface with melted regions observed mainly at the crest regions of waves. The interface of Ti/steel clads before and after annealing was previously investigated mostly in respect to the melted regions. Here, a sharp interface between the waves was analyzed in detail. The obtained results indicate that the microstructure of a transition zone of that area is different along the width. After the heat treatment at 600 °C for 1.5 hours, titanium carbide (TiC) together with α-Fe phase forms at the interface in local areas of relatively wide interlayer (~ 1 µm), while for most of the sharp interface, a much thinner zone up to about 400 nm, formed by four sublayers containing intermetallic phase and carbides, is present. This confirms that carbon diffusion induced by applied heat treatment significantly influences the final microstructure of the Ti/steel interface zone. Side bending tests confirmed high plasticity of welds after applied heat treatment; however, the microhardness measurements indicated that the strengthening of the steel in the vicinity of the interface had not been removed completely.

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