Laser Weld Seam Tracking Sensing Technology Based on Swing Mirror

Abstract

Based on the principle of laser triangulation measurement, a laser welding seam tracking sensor is developed to track U-shaped, V-shaped and flat bottom grooves of pipeline welds in real time. Aiming at the problems of reflection of pipeline welding groove and strong welding arc, which affect the accuracy of U-shaped groove feature recognition, a laser welding seam tracking sensing technology based on swing mirror is developed. The image sensor collects the weld features of the spot-shaped spot area in a cycle, and connects to form a cross-sectional weld feature, which can effectively improve the signal-to-noise ratio of the weld feature identification signal. the actual machine test of pipeline weld tracking is carried out. In the identification test of U-shaped, V-shaped, flat bottom groove, extremely deep and wide weld (40mm depth&30mm width) and extremely deep and narrow weld (40mm depth&12mm width), the sensor has good recognition accuracy and stability.