A visual sensing system was established to monitor the weld pool in laser spot welding. The top-hat and bottom-hat transformation algorithms based on mathematical morphology were used to compensate for non-uniform con...A visual sensing system was established to monitor the weld pool in laser spot welding. The top-hat and bottom-hat transformation algorithms based on mathematical morphology were used to compensate for non-uniform contrast of weld pool edge. Moreover, the canny edge detector was applied to extract the weld paol profile. The edge detected results show that the morphological operation is obviously superior to the traditional contrast enhancement method. In addition, the combination of dilation and erosion was applied to eliminate the irrelevant edge details, and the smooth weld pool edge was acquired. Based on the image processing technology described above, the dynamic process of weld pool diameter during laser spot welding was obtained.展开更多
Spot laser welding was applied for fastening of protective bearing washers.Corresponding technology and laser welding plants are described. Correlation between appearance of the spot welds and their quality was dis...Spot laser welding was applied for fastening of protective bearing washers.Corresponding technology and laser welding plants are described. Correlation between appearance of the spot welds and their quality was discovered. Mechanism of the welding distortion has been revealed.展开更多
文摘A visual sensing system was established to monitor the weld pool in laser spot welding. The top-hat and bottom-hat transformation algorithms based on mathematical morphology were used to compensate for non-uniform contrast of weld pool edge. Moreover, the canny edge detector was applied to extract the weld paol profile. The edge detected results show that the morphological operation is obviously superior to the traditional contrast enhancement method. In addition, the combination of dilation and erosion was applied to eliminate the irrelevant edge details, and the smooth weld pool edge was acquired. Based on the image processing technology described above, the dynamic process of weld pool diameter during laser spot welding was obtained.
文摘Spot laser welding was applied for fastening of protective bearing washers.Corresponding technology and laser welding plants are described. Correlation between appearance of the spot welds and their quality was discovered. Mechanism of the welding distortion has been revealed.
