The Experts below are selected from a list of 3885 Experts worldwide ranked by ideXlab platform
John Powell - One of the best experts on this subject based on the ideXlab platform.
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heat affected zones and oxidation marks in fiber laser Oxygen Cutting of mild steel
2011Co-Authors: S O Almashikhi, John Powell, Alexander Kaplan, K T VoiseyAbstract:The effect of Cutting speed and sheet thickness on surface oxidation and heat affected zones (HAZs) has been investigated for laser–Oxygen Cutting of mild steel sheet with a fiber laser. Optical and scanning electron micrographs were used to determine the extent of surface oxidation and HAZ from plan and cross-sectional views, respectively. The HAZ is consistently wider at the bottom of the cut compared to the HAZ at the top of the cut. With increasing speed, the width of the HAZ at the top of the cut decreases whereas the HAZ width at the bottom of the cut generally increases. No simple, direct relationship between HAZ width and surface oxidation was seen. However, it is possible to state that in each case considered here, the HAZ would be completely removed if they are machined back by a depth equal to the extent of the surface oxidation.
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fibre laser Cutting of thin section mild steel an explanation of the striation free effect
2011Co-Authors: John Powell, S O Almashikhi, Alexander Kaplan, K T VoiseyAbstract:This paper presents the results of an experimental and theoretical investigation into the phenomenon of 'striation free Cutting', which is a feature of fibre laser/Oxygen Cutting of thin section mild steel. The paper concludes that the creation of very low roughness edges is related to an optimisation of the cut front geometry when the cut front is inclined at angles close to the Brewster angle for the laser-material combination.
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laser Oxygen Cutting of mild steel the thermodynamics of the oxidation reaction
2009Co-Authors: John Powell, S O Almashikhi, Alexander Kaplan, Dirk Petring, R V Kumar, K T VoiseyAbstract:In a considerable proportion of the published work on the subject of laser–Oxygen Cutting of mild steel, the details of the oxidation reaction are overlooked or confused. For example, it is not uncommon for the oxidized material to be attributed with the physical characteristics of iron rather than iron oxide. Also, the fact that the oxidation reaction cannot take place above a certain temperature limit is usually overlooked. This paper presents, for the first time, an in-depth analysis of the Iron to FeO oxidation reaction in the context of laser–Oxygen Cutting of mild steel. The paper concludes by presenting a number of guidelines for future theoretical models.
V B Shulyatyev - One of the best experts on this subject based on the ideXlab platform.
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experimental study of laser Oxygen Cutting of low carbon steel using fibre and co2 lasers under conditions of minimal roughness
2014Co-Authors: A A Golyshev, A G Malikov, A M Orishich, V B ShulyatyevAbstract:The results of an experimental study of laser-Oxygen Cutting of low-carbon steel using fibre and CO2 lasers are generalised. The dependence of roughness of the cut surface on the Cutting parameters is investigated, and the conditions under which the surface roughness is minimal are formulated. It is shown that for both types of lasers these conditions can be expressed in the same way in terms of the dimensionless variables – the Peclet number Pe and the output power Q of laser radiation per unit thickness of the cut sheet – and take the form of the similarity laws: Pe = const, Q = const. The optimal values of Pe and Q are found. We have derived empirical expressions that relate the laser power and Cutting speed with the thickness of the cut sheet under the condition of minimal roughness in the case of Cutting by means of radiation from fibre and CO2 lasers.
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scaling laws for the laser Oxygen Cutting of thick sheet mild steel
2009Co-Authors: A G Malikov, A M Orishich, V B ShulyatyevAbstract:Abstract The laws of scaling the laser-Oxygen Cutting of mild steel based on experimental optimization are proposed. The sheets from 5 to 25 mm are cut with the aid of CO 2 laser. It has been established that the minimal surface roughness is reached within the whole thickness range if the laser energy value per unit of the removed material and the power per sheet thickness unit are held constant. The results permit to determine the laser power and Cutting speed values optimal for a certain sheet thickness. Within the range of large thicknesses, the conditions of Cutting with minimal roughness are written as ratios between dimensionless variables. Evaluation of the maximum thickness of the sheet, at which the high-quality Cutting is realizable, has been made.
K T Voisey - One of the best experts on this subject based on the ideXlab platform.
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heat affected zones and oxidation marks in fiber laser Oxygen Cutting of mild steel
2011Co-Authors: S O Almashikhi, John Powell, Alexander Kaplan, K T VoiseyAbstract:The effect of Cutting speed and sheet thickness on surface oxidation and heat affected zones (HAZs) has been investigated for laser–Oxygen Cutting of mild steel sheet with a fiber laser. Optical and scanning electron micrographs were used to determine the extent of surface oxidation and HAZ from plan and cross-sectional views, respectively. The HAZ is consistently wider at the bottom of the cut compared to the HAZ at the top of the cut. With increasing speed, the width of the HAZ at the top of the cut decreases whereas the HAZ width at the bottom of the cut generally increases. No simple, direct relationship between HAZ width and surface oxidation was seen. However, it is possible to state that in each case considered here, the HAZ would be completely removed if they are machined back by a depth equal to the extent of the surface oxidation.
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fibre laser Cutting of thin section mild steel an explanation of the striation free effect
2011Co-Authors: John Powell, S O Almashikhi, Alexander Kaplan, K T VoiseyAbstract:This paper presents the results of an experimental and theoretical investigation into the phenomenon of 'striation free Cutting', which is a feature of fibre laser/Oxygen Cutting of thin section mild steel. The paper concludes that the creation of very low roughness edges is related to an optimisation of the cut front geometry when the cut front is inclined at angles close to the Brewster angle for the laser-material combination.
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laser Oxygen Cutting of mild steel the thermodynamics of the oxidation reaction
2009Co-Authors: John Powell, S O Almashikhi, Alexander Kaplan, Dirk Petring, R V Kumar, K T VoiseyAbstract:In a considerable proportion of the published work on the subject of laser–Oxygen Cutting of mild steel, the details of the oxidation reaction are overlooked or confused. For example, it is not uncommon for the oxidized material to be attributed with the physical characteristics of iron rather than iron oxide. Also, the fact that the oxidation reaction cannot take place above a certain temperature limit is usually overlooked. This paper presents, for the first time, an in-depth analysis of the Iron to FeO oxidation reaction in the context of laser–Oxygen Cutting of mild steel. The paper concludes by presenting a number of guidelines for future theoretical models.
A G Malikov - One of the best experts on this subject based on the ideXlab platform.
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experimental comparison of laser energy losses in high quality laser Oxygen Cutting of low carbon steel using radiation from fibre and co2 lasers
2015Co-Authors: A A Golyshev, A G Malikov, A M Orishich, V B ShulyatevAbstract:We report a comparative experimental study of laserOxygen Cutting of low-carbon steel using a fibre laser with a wavelength of 1.07 μm and a CO2 laser with a wavelength of 10.6 μm at the sheet thickness of 3 – 16 mm. For the two lasers we have measured the dependence of the Cutting speed on the radiation power and determined the Cutting speed at which the surface roughness is minimal. The coefficient of laser radiation absorption in the laser Cutting process is measured for these lasers at different values of the Cutting speed and radiation power. It is found that the minimal roughness of the cut surface is reached at the absorbed laser energy per unit volume of the removed material, equal to 11 – 13 J mm-3; this value is the same for the two lasers and does not depend on the sheet thickness.
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experimental study of laser Oxygen Cutting of low carbon steel using fibre and co2 lasers under conditions of minimal roughness
2014Co-Authors: A A Golyshev, A G Malikov, A M Orishich, V B ShulyatyevAbstract:The results of an experimental study of laser-Oxygen Cutting of low-carbon steel using fibre and CO2 lasers are generalised. The dependence of roughness of the cut surface on the Cutting parameters is investigated, and the conditions under which the surface roughness is minimal are formulated. It is shown that for both types of lasers these conditions can be expressed in the same way in terms of the dimensionless variables – the Peclet number Pe and the output power Q of laser radiation per unit thickness of the cut sheet – and take the form of the similarity laws: Pe = const, Q = const. The optimal values of Pe and Q are found. We have derived empirical expressions that relate the laser power and Cutting speed with the thickness of the cut sheet under the condition of minimal roughness in the case of Cutting by means of radiation from fibre and CO2 lasers.
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energy characteristics of laser Oxygen Cutting of steel by co2 laser radiation
2012Co-Authors: A G Malikov, A M Orishich, V B ShulyatevAbstract:The energy balance in the laser-Oxygen Cutting of steel sheets of thickness 5 — 16 mm was investigated. The necessary expenditure of energy and the thermal efficiency of the process were determined for Cutting parameters that provided minimal roughness (characteristic height of irregularities) of the cut surface. For the minimal roughness, the ratio between the components of the energy balance equation was determined to be independent of the sheet thickness. We also measured the oxidised iron fraction in the melt being removed.
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scaling laws for the laser Oxygen Cutting of thick sheet mild steel
2009Co-Authors: A G Malikov, A M Orishich, V B ShulyatyevAbstract:Abstract The laws of scaling the laser-Oxygen Cutting of mild steel based on experimental optimization are proposed. The sheets from 5 to 25 mm are cut with the aid of CO 2 laser. It has been established that the minimal surface roughness is reached within the whole thickness range if the laser energy value per unit of the removed material and the power per sheet thickness unit are held constant. The results permit to determine the laser power and Cutting speed values optimal for a certain sheet thickness. Within the range of large thicknesses, the conditions of Cutting with minimal roughness are written as ratios between dimensionless variables. Evaluation of the maximum thickness of the sheet, at which the high-quality Cutting is realizable, has been made.
A M Orishich - One of the best experts on this subject based on the ideXlab platform.
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experimental comparison of laser energy losses in high quality laser Oxygen Cutting of low carbon steel using radiation from fibre and co2 lasers
2015Co-Authors: A A Golyshev, A G Malikov, A M Orishich, V B ShulyatevAbstract:We report a comparative experimental study of laserOxygen Cutting of low-carbon steel using a fibre laser with a wavelength of 1.07 μm and a CO2 laser with a wavelength of 10.6 μm at the sheet thickness of 3 – 16 mm. For the two lasers we have measured the dependence of the Cutting speed on the radiation power and determined the Cutting speed at which the surface roughness is minimal. The coefficient of laser radiation absorption in the laser Cutting process is measured for these lasers at different values of the Cutting speed and radiation power. It is found that the minimal roughness of the cut surface is reached at the absorbed laser energy per unit volume of the removed material, equal to 11 – 13 J mm-3; this value is the same for the two lasers and does not depend on the sheet thickness.
-
experimental study of laser Oxygen Cutting of low carbon steel using fibre and co2 lasers under conditions of minimal roughness
2014Co-Authors: A A Golyshev, A G Malikov, A M Orishich, V B ShulyatyevAbstract:The results of an experimental study of laser-Oxygen Cutting of low-carbon steel using fibre and CO2 lasers are generalised. The dependence of roughness of the cut surface on the Cutting parameters is investigated, and the conditions under which the surface roughness is minimal are formulated. It is shown that for both types of lasers these conditions can be expressed in the same way in terms of the dimensionless variables – the Peclet number Pe and the output power Q of laser radiation per unit thickness of the cut sheet – and take the form of the similarity laws: Pe = const, Q = const. The optimal values of Pe and Q are found. We have derived empirical expressions that relate the laser power and Cutting speed with the thickness of the cut sheet under the condition of minimal roughness in the case of Cutting by means of radiation from fibre and CO2 lasers.
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energy characteristics of laser Oxygen Cutting of steel by co2 laser radiation
2012Co-Authors: A G Malikov, A M Orishich, V B ShulyatevAbstract:The energy balance in the laser-Oxygen Cutting of steel sheets of thickness 5 — 16 mm was investigated. The necessary expenditure of energy and the thermal efficiency of the process were determined for Cutting parameters that provided minimal roughness (characteristic height of irregularities) of the cut surface. For the minimal roughness, the ratio between the components of the energy balance equation was determined to be independent of the sheet thickness. We also measured the oxidised iron fraction in the melt being removed.
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scaling laws for the laser Oxygen Cutting of thick sheet mild steel
2009Co-Authors: A G Malikov, A M Orishich, V B ShulyatyevAbstract:Abstract The laws of scaling the laser-Oxygen Cutting of mild steel based on experimental optimization are proposed. The sheets from 5 to 25 mm are cut with the aid of CO 2 laser. It has been established that the minimal surface roughness is reached within the whole thickness range if the laser energy value per unit of the removed material and the power per sheet thickness unit are held constant. The results permit to determine the laser power and Cutting speed values optimal for a certain sheet thickness. Within the range of large thicknesses, the conditions of Cutting with minimal roughness are written as ratios between dimensionless variables. Evaluation of the maximum thickness of the sheet, at which the high-quality Cutting is realizable, has been made.
