Detection of Weld Seam Position Based on Infrared Image during High Power Fiber Laser Welding

Abstract:

Seam tracking is significant to obtain good welding quality. Aiming at establishing a model to detect and calculate the seam tracking offset during high-power fiber laser welding of Type 304 austenitic stainless steel plate butt joint welding, an infrared sensitive high-speed camera arranged off-axis orientation of laser beam was applied to capture the dynamic thermal images of molten pool. Through analyzing the infrared image, the actual position of the workpiece gap in the image was obtained. Least squares method was used to determine the precise position of the actual workpiece gap. A model that calculated the deviations between the workpiece gap and the laser beam was deduced. Also, the least squares method was used to fit the workpiece gap curve equation. The coordinate transformation technology was used and the welding seam equation was established. A linear model was obtained to detect the deviations between the workpiece gap and the welding seam. The welding experiments confirmed that the proposed welding seam equation was effective.

• Periodical: Advanced Materials Research (Volume 549)
• Pages: 1007-1011
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.549.1007
• Online since: July 2012
• Authors: Yu Quan Chen, Xiang Dong Gao, Jian Yuan Huang, Qian Wen
• Keywords: High-Power Fiber Laser Welding, Least-Square Method (LSM), Weld Pool, Welding Seam, Workpiece Gap

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