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http://dx.doi.org/10.3795/KSME-B.2011.35.2.153

Study of Characteristics of Assist Gas in Laser Machining Using Flow Visualization Techniques  

Son, Sang-Hyuk (Dept. of Mechanical and Aerospace Engineering, Korea Aerospace Univ.)
Lee, Yeol (Dept. of Mechanical and Aerospace Engineering, Korea Aerospace Univ.)
Min, Seong-Kyu (Dept. of Mechanical and Aerospace Engineering, Korea Aerospace Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.35, no.2, 2011 , pp. 153-160 More about this Journal
Abstract
The characteristics of supersonic coaxial/off-axis jet impingements on a slanted kerf surface were experimentally studied, to investigate the role of the assist gas that removes molten materials from cut zone formed by laser machining. In this parametric study, hundreds of high-resolution schlieren images were obtained for various gas pressures, distances between nozzle exit and kerf surface, kerf widths, and alignments of off-axis nozzle. It was noticed that simply increasing the assist gas pressure was not effective in eliminating the flow separation that occurs downstream of the kerf surface. However, it was also observed that by increasing the kerf width and utilizing off-axis nozzles, the separation of the assist gas on the kerf surface can be weakened. The effect of the distance between the nozzle exit and the kerf surface on the characteristics of separation occurring on the kerf surface was found to be lower in the case of supersonic nozzles than that in the case of sonic nozzles.
Keywords
Supersonic; Jet Impingements; Laser Machining; Assist Gas;
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Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By SCOPUS : 1
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