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Proceedings Paper

Plasma light emission monitoring and penetration status recognition in CO2 laser welding of AZ31B wrought magnesium alloy
Author(s): Wen-da Tan; Ji-guo Shan; Xiang Lei; Jing Zhang; Wu-zhu Chen; Jia-lie Ren
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Paper Abstract

Sheets of AZ31B wrought magnesium alloy were welded by CO2 laser. Welds of "partial penetration", "weld pool penetration", "keyhole penetration" and "excessive penetration" were obtained, and the "keyhole penetrated" weld possessed the best quality. The light emission of welding plasma was monitored by photo-diode, and it was found that the photo-diode signal varied with different penetration statuses. When the welds were "weld pool penetrated" and "keyhole penetrated", the average signal amplitude A reached its minimum value. R, which defined as ratio of A and standard deviation δs of signal was introduced to describe the fluctuation tendency of plasma, and the ratio reached its maximum value (which meant the lowest plasma stability) when welds were "weld pool penetrated". By detecting the minimum value of A and R, "keyhole penetration" can be differentiated from "weld pool penetration" and "excessive penetration".

Paper Details

Date Published: 1 February 2008
PDF: 9 pages
Proc. SPIE 6825, Lasers in Material Processing and Manufacturing III, 682502 (1 February 2008); doi: 10.1117/12.757469
Show Author Affiliations
Wen-da Tan, Tsinghua Univ. (China)
Ji-guo Shan, Tsinghua Univ. (China)
Key Lab. for Advanced Materials Processing Technology, Ministry of Education (China)
Xiang Lei, Tsinghua Univ. (China)
Jing Zhang, Tsinghua Univ. (China)
Wu-zhu Chen, Tsinghua Univ. (China)
Jia-lie Ren, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 6825:
Lasers in Material Processing and Manufacturing III
ShuShen Deng; Akira Matsunawa; Xiao Zhu, Editor(s)

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