In June, Ingemar Eriksson presented his Licentiate thesis. The title "Optical Monitoring and Analysis of Laser Welding" reveals that the research involves optical monitoring and analysis of laser welding. The common thread has been the use of high speed speed cameras to investigate how the laser welding process works in reality.
An example of research is the use of a Photron SA-1 camera that in 180 000 frames per second captured the images from laser welding. By zooming in on the keyhole edge the surface structure inside the keyhole could be shown. On the videos you can clearly see that a continuous downward flow in the keyhole front wall when welding at the slightly higher speed. Through a new developed algorithm the flow rate could be measured and analyzed and it turns out that the flow at the keyhole front is proportional to the laser power.
The thesis in its entirety can be downloaded by using this link: