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http://dx.doi.org/10.7736/KSPE.2015.32.11.989

Defect Detection in Laser Welding Using Multidimensional Discretization and Event-Codification  

Baek, Su Jeong (Department of Human and Systems Engineering, Ulsan National Institute of Science and Technology)
Oh, Rocku (Department of Human and Systems Engineering, Ulsan National Institute of Science and Technology)
Kim, Duck Young (Department of Human and Systems Engineering, Ulsan National Institute of Science and Technology)
Publication Information
Journal of the Korean Society for Precision Engineering / v.32, no.11, 2015 , pp. 989-995 More about this Journal
Abstract
In the literature, various stochastic anomaly detection methods, such as limit checking and PCA-based approaches, have been applied to weld defect detection. However, it is still a challenge to identify meaningful defect patterns from very limited sensor signals of laser welding, characterized by intermittent, discontinuous, very short, and non-stationary random signals. In order to effectively analyze the physical characteristics of laser weld signals: plasma intensity, weld pool temperature, and back reflection, we first transform the raw data of laser weld signals into the form of event logs. This is done by multidimensional discretization and event-codification, after which the event logs are decoded to extract weld defect patterns by $Na{\ddot{i}}ve$ Bayes classifier. The performance of the proposed method is examined in comparison with the commercial solution of PRECITEC's LWM$^{TM}$ and the most recent PCA-based detection method. The results show higher performance of the proposed method in terms of sensitivity (1.00) and specificity (0.98).
Keywords
Laser welding; Defect detection; Discretization; Event-Codification;
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Times Cited By KSCI : 3  (Citation Analysis)
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