The Study Of Laser Fusion Welding Process Parameters Measurement Based On Welding Image

In the high-power laser welding process,the laser beam acts on the baseplate.In few millseconds, melting, vaporization and ionization happened. Laser welding process is complex,and the time is short.So, the measurement of the laser welding process dynamic parameters is hard.Because of high cost of the experiment,traditional methods almost can't use extensively because of wasting materials or craft complication,the author uses a new offline analysis method ,using image processing technology,analysicing the high speed camera picture of laser welding process,to measure the dynamic parameters and temperature field distribution feature,providing proof for deeper reseach of machnism and real-time detecting.Based on the reasch status of the laser welding process measurement,at first,the author analysised the hardness of the direct measurement ,the defect of the offline analysis method used and the reasons impacting the quality,then analysised the condition of the combination between image processing technology and laser welding process measurement.Based on the analysis,the photos of laser welding would be processed,the spray diameters and highest vilocity would be figured out.According to the relation between the spraying status and diameter and highest vilocity,constructing the model to forecast the spraying status by the Partial Least-Squres Regression method.In another way,the author analysised the laser welding pool photos.Through the analysis,the distribution of the temperature field, time parameters of the welding pool,and the time history of the welding pool center point would carry out.Experiment shows that the high speed camera picture of laser welding process can reappear laser welding process,offline analysis can be considerable as derect measurement.And the measurement method is more easier,reduce the cost of experiment.The reseach can provide the theoretical basis for practical production.