Effect of focal position on cut surface quality in laser cutting of 50-mm thick stainless steel

2021 ◽  
pp. 2140018
Author(s):  
Moo-Keun Song ◽  
Jong-Do Kim ◽  
Dong-Sig Shin ◽  
Su-Jin Lee ◽  
Dae-Won Cho
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Laser Cutting ◽  
Nuclear Power ◽  
Surface Characteristics ◽  
Kerf Width ◽  
Power Structures ◽  
Thick Sample ◽  
Focal Position ◽  
Cut Surface

In this study, the parameters for underwater laser cutting of 50-mm thick stainless steel, which is typically used in nuclear power structures, are investigated. The focal position of laser beam significantly affects the cutting quality. In particular, in the cutting of the thick sample, change in the focal position determines the kerf width and the roughness of the cut surface. Moreover, the effects of the variation of kerf width and the cut surface characteristics on the focal position of the laser beam are investigated. As the focal position moved to the inside of the material, the upper kerf width increased, but the quality of the cut surface was improved.

scholarly journals Fundamental Study on Underwater Cutting of 50 mm-Thick Stainless Steel Plates Using a Fiber Laser for Nuclear Decommissioning

2022 ◽  
Vol 12 (1) ◽  
pp. 495
Author(s):  
Kwan Kim ◽  
Moo-Keun Song ◽  
Su-Jin Lee ◽  
Dongsig Shin ◽  
Jeong Suh ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Laser Power ◽  
Laser Cutting ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Cutting Speed ◽  
Cutting Surface ◽  
Focal Position ◽  
Underwater Laser

With nuclear power plants worldwide approaching their design lifespans, plans for decommissioning nuclear power plants are increasing, and interest in decommissioning technology is growing. Laser cutting, which is suitable for high-speed cutting in underwater environments and is amenable to remote control and automation, has attracted considerable interest. In this study, the effects of laser cutting were analyzed with respect to relevant parameters to achieve high-quality underwater laser cutting for the decommissioning of nuclear power plants. The kerf width, drag line, and roughness of the specimens during the high-power laser cutting of 50 mm-thick stainless steel in an underwater environment were analyzed based on key parameters (focal position, laser power, and cutting speed) to determine the conditions for satisfactory cutting surface quality. The results indicated that underwater laser cutting with a speed of up to 130 mm/min was possible at a focal position of 30 mm and a laser power of 9 kW; however, the best-quality cutting surface was obtained at a cutting speed of 30 mm/min.

Effect of Laser Beam Diameter on Cut Edge of Steel Plates Obtained by Laser Machining

2013 ◽  
Vol 467 ◽  
pp. 227-232 ◽  
Author(s):  
Imed Miraoui ◽  
Mouna Zaied ◽  
Mohamed Boujelbene
Keyword(s):  
Laser Beam ◽  
Laser Cutting ◽  
Steel Plates ◽  
Beam Diameter ◽  
Power Laser ◽  
Laser Beam Diameter ◽  
Machined Surface ◽  
Cut Edge ◽  
Thermal Influence ◽  
Cut Surface

Laser cutting is a thermal process which is used contactless to separate materials. In the present study, high-power laser cutting of steel plates is considered and the thermal influence of laser cutting on the cut edges is examined. The microstructure and the microhardness of the cut edge are affected by the input laser cutting parameter: laser beam diameter. The aim of this work is to investigate the effect of the laser beam diameter on the microhardness beneath the cut surface of steel plates obtained by CO2 laser cutting. The cut surface was studied based on microhardness depth profiles beneath the machined surface. The results show that laser cutting has a thermal effect on the surface microstructure and on the microhardness beneath the cut section. Also the microhardness of the hardening zone depends on the laser beam diameter.

Analysis of Roughness and Heat Affected Zone of Steel Plates Obtained by Laser Cutting

2014 ◽  
Vol 974 ◽  
pp. 169-173 ◽  
Author(s):  
Imed Miraoui ◽  
Mohamed Boujelbene ◽  
Emin Bayraktar
Keyword(s):  
Surface Roughness ◽  
Laser Beam ◽  
Heat Affected Zone ◽  
Laser Power ◽  
Laser Cutting ◽  
Major Effect ◽  
Steel Plates ◽  
Beam Diameter ◽  
Laser Beam Diameter ◽  
Cut Surface

In the present study, high-power CO2 laser cutting of steel plates has been investigated and the effect of the input laser cutting parameters on the cut surface quality is analyzed. The average roughness of the cut surface of the specimens, produced by different laser beam diameter and laser power, were measured by using roughness tester. The scanning electron microscopy SEM is used to record possible metallurgical alterations on the cut edge. The aim of this work is to investigate the effect of laser beam diameter and laser power on the cut surface roughness and on the heat affected zone width HAZ of steel plates obtained by CO2 laser cutting. An overall optimization was applied to find out the optimal cutting setting that would improve the cut surface quality. It was found that laser beam diameter has a negligible effect on surface roughness but laser power had major effect on roughness. The cut surface roughness decreases as laser power increases. Improved surface roughness can be obtained at higher laser power. Also, laser beam diameter and laser power had major effect on HAZ width. It increases as laser power increases.

scholarly journals Influence of cutting parameters on the quality of the cut surfaces of steel swith a laser beam

2019 ◽  
Vol 44 (1) ◽  
pp. 21-27
Author(s):  
Dobre Runchev ◽  
Filip Zdraveski ◽  
Irena Ivanova
Keyword(s):  
Laser Beam ◽  
Laser Cutting ◽  
Visual Inspection ◽  
Cutting Speed ◽  
Base Material ◽  
Cutting Parameters ◽  
Thermal Cutting ◽  
Materials Used ◽  
Cut Surface

The main objective of the research covered in this paper is to present results for the quality of surfaces thermally cut with a laser beam. The variety of steel materials used as samples on which laser cutting is performed are the following Č.0146 (1.0330), Č.0147 (1.0333), Č.2131 (1.5024), SS Ferbec CR, HARDOX 450 and HARDOX 550. Thermal cutting is carried out with a CNC controlled Fiber laser BAYKAL type BLS–F–1530. The quality of the cut surface is analyzed based on varying the power of the laser beam, changing cutting speed and the type of additional gas (oxygen, air and nitrogen). By visual inspection, measuring the roughness of the cut surface and measuring the width of the intersection, it is determined the influence of the factors like type of the base material, type of gases, the power of thelaser beam and the cutting speed, in accordance with the standards DIN EN ISO 9013-2002 and the JUS C.T3.022.

New Application of Lap Laser Welding on Stainless Steel Railway Vehicles

2010 ◽  
Vol 44-47 ◽  
pp. 2578-2582 ◽  
Author(s):  
Hong Xiao Wang ◽  
Chun Sheng Wang ◽  
Chun Yuan Shi
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Laser Welding ◽  
Process Parameters ◽  
Laser Power ◽  
Spot Welding ◽  
Tensile Tests ◽  
Railway Vehicles ◽  
Optimization Of Process Parameters ◽  
Focal Position

Recently the problems of resistance spot welding (RSW) stainless steel railway vehicles are causing more attention for poor surface quality. Lap laser welding of stainless steel is investigated with OED(Orthogonal experimental designing ) in this study to replace RSW with the aim of to increase the aesthetics of the car body by eliminating visible indentation on the surface and the flatness of the skin reducing welding deformations. After welding tensile tests and microstructure analysis are performed. The optimization of process parameters were: laser power =2.5kW；welding speed=2.2m/min, focal position=0mm. The fusion zone is symmetrical about the axis of the laser beam and no welding cracks or porosity can be found in any of the welds. This work has great significance of improving the manufacturing level of stainless steel railway vehicles.

Effects of Laser Cutting Main Parameters on Microhardness and Microstructure Changes of Stainless Steel

2013 ◽  
Vol 664 ◽  
pp. 811-816 ◽  
Author(s):  
Imed Miraoui ◽  
Mohamed Boujelbene ◽  
Emin Bayraktar
Keyword(s):  
Stainless Steel ◽  
Laser Power ◽  
Laser Cutting ◽  
Cutting Speed ◽  
Experimental Tests ◽  
Cutting Parameters ◽  
Surface Microstructure ◽  
Machined Surface ◽  
Microhardness And Microstructure ◽  
Cut Surface

Laser cutting of materials is becoming the preferred method of cutting. It has many advantages over conventional machining techniques such as better quality of cuts, quick and accurate cutting. The objective of this work is to investigate the effect of the main input laser cutting parameters, laser power and cutting speed, on the microhardness of stainless steel sheets obtained by CO2 laser cutting. The experimental tests were performed at various laser powers and cutting speeds. The cut surface was studied based on microhardness depth profiles beneath the machined surface. In order to investigate the metallurgical alterations beneath the cut surface, the microstructure was observed by using scanning electron microscopy. The results show that the microhardness and the surface microstructure are affected by laser cutting. Laser cutting leads to the formation of periodic striations and cracks. Also the main parameters of cutting, laser power and cutting speed, have an effect on surface microstructure and microhardness.

Experimental Investigation of Multiple Quality Characteristics of Laser Beam Machined Surface using Integrated Taguchi and Fuzzy Logic Method

2016 ◽  
Vol 16 (3) ◽  
pp. 189-199 ◽  
Author(s):  
Anish Kumar ◽  
Vinod Kumar ◽  
Gaurav Sharma
Keyword(s):  
Fuzzy Logic ◽  
Laser Beam ◽  
Process Parameters ◽  
Material Removal Rate ◽  
Performance Index ◽  
Laser Cutting ◽  
Material Removal ◽  
Removal Rate ◽  
Research Work ◽  
Kerf Width

AbstractIn laser cutting, the capability of laser cutting mainly depends on optical and thermal properties of work material. The surface quality and metallurgical properties of the product is most important from the point of laser cutting quality. The present research work explores the modeling and optimization of laser beam cutting process parameters by using hybrid approach of Taguchi based fuzzy logic. The multi-response optimization of process parameters has been done to improve geometrical accuracy by minimizing the kerf width and kerf deviation. The four input parameters power, gas pressure, feed rate, pulse frequency and three output parameters kerf width (KW), kerf deviation (KD) and material removal rate (MRR) have been taken for the experimentation work. The S/N ratios taken for the KW and KD is of the smaller-the-better type and MRR is of the higher the better type. The predicting fuzzy logic model is implemented on Fuzzy Logic Toolbox of MATLAB using Mamdani technique. The fuzzy logic theory has been applied to compute the fuzzy multi-response performance index (FMRPI). This performance index is further used for multi-objective optimization. The selected samples were analyzed using scanning electron microscope. The predicted optimum results have been validated by performing the confirmation tests. The confirmation tests showed the considerable reduction in kerf deviation and increase in material removal rate.

scholarly journals Rapid Prototyping of Art Sculptural Shapes According to the Sample

2019 ◽  
Vol 44 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Saša Živanović ◽  
Slobodan Tabaković ◽  
Saša Radjelović
Keyword(s):  
Laser Beam ◽  
Fiber Laser ◽  
Laser Cutting ◽  
Visual Inspection ◽  
Cutting Speed ◽  
Base Material ◽  
Thermal Cutting ◽  
Materials Used ◽  
Cut Surface

The main objective of the research covered in this paper is to present results for the quality of surfaces thermally cut with a laser beam. The variety of steel materials used as samples on which laser cutting is performed are the following Č.0146 (1.0330), Č.0147 (1.0333), Č.2131 (1.5024), SS Ferbec CR, HARDOX 450 and HARDOX 550. Thermal cutting is carried out with a CNC controlled Fiber laser BAYKAL type BLS–F–1530. The quality of the cut surface is analyzed based on varying the power of the laser beam, changing cutting speed and the type of additional gas (oxygen, air and nitrogen). By visual inspection, measuring the roughness of the cut surface and measuring the width of the intersection, it is determined the influence of the factors like type of the base material, type of gases, the power of thelaser beam and the cutting speed, in accordance with the standards DIN EN ISO 9013-2002 and the JUS C.T3.022.

Investigation of Corrosion Properties of Welded and Laser-Surface Melted SUS 304 in Nuclear Power Operating Conditions

2009 ◽  
Author(s):  
Joung Soo Kim ◽  
Chin-Man Chung ◽  
Sung-Hoon Baik ◽  
Sang-Bae Lee
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Laser Beam ◽  
Laser Power ◽  
Nuclear Power ◽  
Laser Surface ◽  
Operating Conditions ◽  
Laser Surface Melting ◽  
304 Stainless Steel ◽  
Process Conditions

Welded SUS 304 stainless steel surface was melted using an Nd:YAG laser beam in order to increase its corrosion resistance in operating conditions of nuclear power plants. The optimum process conditions for laser-surface melting of welded SUS 304 stainless steel were determined by measuring the depth melted by the laser beam of welded regions through an optical microscope, observing the microstructures of the laser-melted surface, and measuring the double-loop electrochemical potentio-dynamic reactivation (DL-EPR) curves in a 1L aqueous solution of 0.5M H2SO4 and 0.01M KSCN. From the test results, the optimum laser-surface melting process conditions were as follows; a laser power of 170W, a N2 gas flow rate of 20L/min, a beam scan rate of 600mm/min, and laser power density of 20J/mm2. The microstructure of the laser-surface melted (LSM) region was observed to be very fine and homogenous, and of cellular structure. Grain growth in the LSM region from the substrate occurred epitaxially. No Cr depletion along the grain boundary in the LSM region was detected, which would result in increasing the corrosion, specially intergranular corrosion (IGC) including intergranular stress corrosion resistance (IGSCC) of the welded SUS 304.

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