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Process monitoring for laser welding using a quality sensor for cutting

In typical optical sensor setups for CO2 laser material processing there are scraper mirrors or beam selectors used to allow sensor positions, which have an coaxial path for both the laser beam and the monitored visible or near- infrared signal. For the monitoring and controlling of the laser welding process it is of interest to get information on the plasma stability. A two color photodiode sensor which has been successfully tested for quality monitoring of both cutting and ablation has been used for welding in order to find correlations between the sensor signal and the quality of the weld seam. Results and comparisons between cutting and welding will be presented.