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Research on the Adaptive Recognition and Location of the Weld Based on the Characteristics of Laser Stripes

An algorithm to identify and locate the weld position based on the characteristics of laser stripes is proposed. First, design the vision system using a laser sensor as the active optical and remove some noise through the Gauss filter. Detect the edges based on the characteristics of the laser stripes by the improved Sobel operator. Then select the strong response points and the correlation lines by the Hough transform. After that the straight lines obtained according to the consistency of the slope is fitted and the intersection point can be found out. Finally, the center point of the weld can be calculated by establishing a mathematical model to eliminate the error caused by the installation of the vision system and the shape of the V groove. The automatic welding experiment demonstrated that the positioning accuracy is up to 0.1852mm and the average response time of the image processing is 0.3223s which proves that the algorithm has fast processing speed, high precision and strong robustness which can meet the needs of the large diameter pipe welding process in actual production application.