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Journal of KWJS 2003;21(6):33-39.
Published online October 27, 2003.
[연구논문] 웨이브렛 변환을 이용한 전자빔 용접 진단
 
Electron Beam Welding Diagnosis Using Wavelet Transform
ChoongSup Yoon
Abstract
Wavelet transform analysis results show a spectrum energy distribution of CWT along scale factors distinguish the partial, full and over penetration in a electron beam welding by analyzing the curve of spectrum energy at small scale, middle and large scale range, respectively. Two types of signals collected by Ion collector and x-ray sensors and analyzed. The acquired signals from sensors are very complicated since these signals are very closely related the dynamics of keyhole which interact the very high density energy with materials during welding. The results show the wavelet transform is more effective to diagnosis than Fourier Transform, further for the general welding defects which are not a periodic based, but a transient, non-stational)' and time-valsing phenomena.
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