In-Process Detection of Weld Defects Using Laser-Based Ultrasound

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Laser-based ultrasonic (LBU) measurement shows great promise for on-line monitoring of weld quality in tailor-welded blanks. Tailor-welded blanks are steel blanks made from plates of differing thickness and/or properties butt-welded together; they are used in automobile manufacturing to produce body, frame, and closure panels. LBU uses a pulsed laser to generate the ultrasound and a continuous wave (CW) laser interferometer to detect the ultrasound at the point of interrogation to perform ultrasonic inspection. LBU enables in-process measurements since there is no sensor contact or near-contact with the workpiece. The authors are using laser-generated plate (Lamb) waves to propagate from one ... continued below

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12 pages

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Bacher, G. D.; Kercel, S. W.; Kisner, R. A.; Klein, M. B. & Pouet, B. September 19, 1999.

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Description

Laser-based ultrasonic (LBU) measurement shows great promise for on-line monitoring of weld quality in tailor-welded blanks. Tailor-welded blanks are steel blanks made from plates of differing thickness and/or properties butt-welded together; they are used in automobile manufacturing to produce body, frame, and closure panels. LBU uses a pulsed laser to generate the ultrasound and a continuous wave (CW) laser interferometer to detect the ultrasound at the point of interrogation to perform ultrasonic inspection. LBU enables in-process measurements since there is no sensor contact or near-contact with the workpiece. The authors are using laser-generated plate (Lamb) waves to propagate from one plate into the weld nugget as a means of detecting defects. This paper reports the results of the investigation of a number of inspection architectures based on processing of signals from selected plate waves, which are either reflected from or transmitted through the weld zone. Bayesian parameter estimation and wavelet analysis (both continuous and discrete) have shown that the LBU time-series signal is readily separable into components that provide distinguishing features which describe weld quality. The authors anticipate that, in an on-line industrial application, these measurements can be implemented just downstream from the weld cell. Then the weld quality data can be fed back to control critical weld parameters or alert the operator of a problem requiring maintenance. Internal weld defects and deviations from the desired surface profile can then be corrected before defective parts are produced.

Physical Description

12 pages

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INIS; OSTI as DE00010335

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  • Photonics East, Boston, MA (US), 09/19/1999--09/22/1999

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  • Report No.: ORNL/CP-104419
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 10335
  • Archival Resource Key: ark:/67531/metadc622792

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 19, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • Nov. 12, 2015, 2:12 p.m.

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Bacher, G. D.; Kercel, S. W.; Kisner, R. A.; Klein, M. B. & Pouet, B. In-Process Detection of Weld Defects Using Laser-Based Ultrasound, article, September 19, 1999; (digital.library.unt.edu/ark:/67531/metadc622792/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.