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Proceedings Paper

Study on three-dimension synchrony high-speed photography of plasma during CO2 laser welding
Author(s): Jinhe Liu; Fusheng Zhang; Licai Ma; Danggang Lei
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Paper 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.

Paper Details

Date Published: 13 January 2005
PDF: 6 pages
Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); doi: 10.1117/12.577886
Show Author Affiliations
Jinhe Liu, Northwestern Polytechnical Univ. (China)
Fusheng Zhang, Northwestern Polytechnical Univ. (China)
Licai Ma, Northwestern Polytechnical Univ. (China)
Danggang Lei, Northwestern Polytechnical Univ. (China)

Published in SPIE Proceedings Vol. 5629:
Lasers in Material Processing and Manufacturing II
ShuShen Deng; Akira Matsunawa; Y. Lawrence Yao; Minlin Zhong, Editor(s)

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