Optical signal oscillations in laser keyhole welding and potential application to lap welding

Describes an optical sensor for process monitoring of Nd:YAG continuous wave laser welding. The sensor detects the broadband radiation produced by the welding process dividing it into broad spectral bands (designated UV/visible and IR). Fourier analysis is used to investigate an oscillatory intensit...

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Bibliographic Details
Published in:Measurement science & technology 1997-06, Vol.8 (6), p.627-633
Main Authors: Haran, F M, Hand, D P, Ebrahim, S M, Peters, C, Jones, J D C
Format: Article
Language:English
Subjects:
Biological and medical applications
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Industrial applications
Optics
Physics
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Description
Summary:Describes an optical sensor for process monitoring of Nd:YAG continuous wave laser welding. The sensor detects the broadband radiation produced by the welding process dividing it into broad spectral bands (designated UV/visible and IR). Fourier analysis is used to investigate an oscillatory intensity modulation of the optical signals, which is believed to arise from a combination of keyhole and weld pool oscillations. The spectral content of the oscillations may be used to detect a fully open welding keyhole and to determine workpiece thickness. (Abstract quotes from original text)
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/8/6/008