Plasma light emission monitoring and penetration status recognition in CO2 laser welding of AZ31B wrought magnesium alloy

Wen-da Tan; Ji-guo Shan; Xiang Lei; Jing Zhang; Wu-zhu Chen; Jia-lie Ren

doi:10.1117/12.757469

1 February 2008 Plasma light emission monitoring and penetration status recognition in CO₂ laser welding of AZ31B wrought magnesium alloy

Wen-da Tan, Ji-guo Shan, Xiang Lei, Jing Zhang, Wu-zhu Chen, Jia-lie Ren

Author Affiliations +

Proceedings Volume 6825, Lasers in Material Processing and Manufacturing III; 682502 (2008) https://doi.org/10.1117/12.757469
Event: Photonics Asia 2007, 2007, Beijing, China

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".

Citation Download Citation

Wen-da Tan, Ji-guo Shan, Xiang Lei, Jing Zhang, Wu-zhu Chen, and Jia-lie Ren "Plasma light emission monitoring and penetration status recognition in CO₂ laser welding of AZ31B wrought magnesium alloy", Proc. SPIE 6825, Lasers in Material Processing and Manufacturing III, 682502 (1 February 2008); https://doi.org/10.1117/12.757469

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