Analysis of laser cutting of 1.2 MM thick austenitic stainless steel
Al Bashir, Mahmood
Rahman, Muhammad Mustafizur
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Atayo, A. A., Bashir, M., Rahman, M. M., & Nair, R. (2020). Analysis of laser cutting of 1.2 MM thick austenitic stainless steel. Paper presented at the ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), , 2B-2020 doi:10.1115/IMECE2020-24513
Stainless steel 304 is one of the most commonly used steel types for corrosion resistance applications, but higher melting point is a limitation in industries from a manufacturing point of view. The non-conventional and subtractive manufacturing technique of laser cutting — a beam directed method, is suitable for these applications. A Gaussian laser beam is directed at the material that melts, burns, vaporizes, or is blown away by a jet of gas, leaving a fine edge with good surface finish. In this study, a numerical study was performed to study the multi-physical fluid processes of laser cutting. Towards this, modeling was performed using 1.2 mm thick austenitic stainless-steel coupons that was cut using a continuous width neodymium-doped yttrium aluminum garnet (CW Nd: YAG) laser. The results showed smoother surface cut, little dross formation, lower temperature rise in heat affected zones, and less finish time at a cutting speed of 8m/min, higher laser power above 1000 W, gas pressure of 11 bars, and focus distance of −1.0 mm. It was observed that an increase in laser power at a faster cutting speed led to an increase in kerf width, reduction in dross formation, lower temperature rises in heat affected zones and a reduced finish time. The simulation results were compared with published experimental data and found to be well within a maximum difference of 15%.
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