Investigation of optimum condition in oxygen gas-assisted laser cutting |
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| Authors: | H. Golnabi M. Bahar |
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| Affiliation: | 1. Institute of Water and Energy, Sharif University of Technology, Tehran, Iran;2. Physics Department, Teacher Training University, Tehran, Iran;1. Department of Mechanical Engineering, Faculty of Engineering, Malayer University, Malayer, Iran;2. Laser Materials Processing Research Center, Malayer University, Malayer, Iran;3. Department of Mechanical Engineering, Urmia University, Urmia, Iran;4. School of Mech. & Maun. Eng., Dublin City University, Dublin, Ireland;1. Applied Physics Department, University of Vigo, EEI, Lagoas-Marcosende, 9, Vigo E- 36310, Spain;2. Business Organization Department, University of Vigo, EEI, Lagoas-Marcosende, Vigo E- 36310, Spain;1. Faculty of Engineering, Rezekne Academy of Technologies, Atbrīvo?anas aleja 115, 4601 Rezekne, Latvia;2. University of Nis, Faculty of Mechanical Engineering, Aleksandra Medvedeva 14, 18000 Nis, Serbia;3. University of Pri?tina, Faculty of Technical Sciences in Kosovska Mitrovica, Kneza Milosa 7, 38220 Kosovska Mitrovica, Serbia;1. School of Computer Science and Information Engineering, Chongqing Technology and Business University, China;2. Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran;3. Sustainable Management of Natural Resources and Environment Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Vietnam |
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| Abstract: | Laser cutting characteristics including power level and cutting gas pressure are investigated in order to obtain an optimum kerf width. The kerf width is investigated for a laser power range of 50–170 W and a gas pressure of 1–6 bar for steel and mild steel materials. Variation of sample thickness, material type, gas pressure and laser power on the average cut width and slot quality are investigated. Optimum conditions for the steel and mild steel materials with a thickness range of 1–2 mm are obtained. The optimum condition for the steel cutting results in a minimum average kerf width of 0.2 mm at a laser power of 67 W, cutting rate of 7.1 mm/s and an oxygen pressure of 4 bar. A similar investigation for the mild steel cutting results in a minimum average kerf width of 0.3 mm at the same laser power of 67 W, cutting rate of 9.5 mm/s, and an oxygen pressure of 1 bar. The experimental average kerf is about 0.3 mm, which is approximately equal to the estimated focused beam diameter of 0.27 mm for our focusing lens (f=4 cm and 100 W power). This beam size leads to a laser intensity of about 1.74×109 W/m2 at the workpiece surface. The estimated cutting rate from theoretical calculation is about 8.07 mm/s (1.0 mm thickness and 100 W power), which agrees with the experimental results that is 7.1 mm/s for 1.0 mm thickness of mild steel at the laser power of 88 W. |
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