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The quality of laser cutting varies greatly depending on several variables, such as laser beam power, focal length, and speed. The flow of gas generated during laser cutting plays an important role in pushing the molten pool to the lower surface of the material, and is a very important factor for dross formation and spatter generation during cutting. Therefore, it is necessary to investigate the flow of gas generated during laser cutting. In this study, we captured the gas flow as a function of the inlet pressure and the stand-off distance with a high-speed camera using the Schlieren method. The images before and after gas injection were used to obtain the image intensity, which was applied to analyze the cutting gas flow for three different parts. We found that the stronger the inlet pressure and the shorter the stand-off distance, the higher the image intensity value, and the higher the gas flow rate, respectively.

Analysis of Gas Flow Behavior in the Laser Cutting Process using the Schlieren Method and Image Processing