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Ultrasonics. 2019 Apr;94:74-81. doi: 10.1016/j.ultras.2018.12.001. Epub 2018 Dec 1.

Convolutional neural network for ultrasonic weldment flaw classification in noisy conditions.

Author information

1
Department of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.
2
Department of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea. Electronic address: hjkim21c@skku.edu.
3
Korea Institute of Nuclear Safety, Daejeon 34142, Republic of Korea.

Abstract

Ultrasonic flaw classification in weldment is an active area of research and many artificial intelligence approaches have been applied to automate this process. However, in the industrial applications, the ultrasonic flaw signals are not noise free and automatic intelligent defect classification algorithms show relatively low classification performance. In addition, most of the algorithms require some statistical or signal processing techniques to extract some features from signals in order to make classification easier. In this article, the convolutional neural network (CNN) is applied to noisy ultrasonic signatures to improve classification performance of weldment defects and applicability. The result shows that CNN is robust, does not require specific feature extraction methods and give considerable high defect classification accuracies even for noisy signals.

KEYWORDS:

Convolutional neural network (CNN); Signal to noise ratio (SNR); Ultrasonic testing; Weldment flaw classification

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