Study on three-dimension synchrony high-speed photography of plasma during CO2 laser welding

Jinhe Liu; Fusheng Zhang; Licai Ma; Danggang Lei

doi:10.1117/12.577886

13 January 2005 Study on three-dimension synchrony high-speed photography of plasma during CO₂ laser welding

Jinhe Liu, Fusheng Zhang, Licai Ma, Danggang Lei

Proceedings Volume 5629, Lasers in Material Processing and Manufacturing II; (2005) https://doi.org/10.1117/12.577886
Event: Photonics Asia, 2004, Beijing, China

Abstract

During CO₂ laser deep penetration welding, the laser-induced plasma significantly effects the process stability and efficient. In this study, the method of three-dimension synchrony high-speed photography is adopted to record the charge of plasma during laser deep penetration welding. The primary version image is in the image plane directly, the vertical view and the side view image also are in the same image plane by two optical fibers and finally three images distribute at the different area of a film. It is clear that the direction variation of laser welding plasma is acute. The reason is that the change of keyhole shape leads to the impact direction variation of the metal vapor to the plasma and it finally affects the motion direction of the laser-induced plasma. The plasma is in the state of irregular rotation and wobbling in space during the laser welding process. The area change curve on continuous 80 frames image are given out. The change extent of relative area on the three images are calculated and the curves of the relative area are showed. It is found that the shape of plasma change quickly and the maximum relative area ratio of the side view image is up to 40 during laser welding.

Citation Download Citation

Jinhe Liu, Fusheng Zhang, Licai Ma, and Danggang Lei "Study on three-dimension synchrony high-speed photography of plasma during CO₂ laser welding", Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); https://doi.org/10.1117/12.577886

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