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

Abstract

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 datamore » 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.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (US)
Sponsoring Org.:
Lasson Technologies, TWB, Inc.; USDOE Office of Science (US)
OSTI Identifier:
10335
Report Number(s):
ORNL/CP-104419
TRN: US0103384
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Conference
Resource Relation:
Conference: Photonics East, Boston, MA (US), 09/19/1999--09/22/1999; Other Information: PBD: 19 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ULTRASONIC TESTING; WELDED JOINTS; DEFECTS; DETECTION; STEELS; LASER RADIATION; INTERFEROMETERS; DATA ANALYSIS; WELD INSPECTION; ON-LINE INSPECTION; BAYESIAN; LASER-BASED ULTRASONIC; WAVELET

Citation Formats

Bacher, G.D., Kercel, S.W., Kisner, R.A., Klein, M.B., and Pouet, B. In-Process Detection of Weld Defects Using Laser-Based Ultrasound. United States: N. p., 1999. Web.
Bacher, G.D., Kercel, S.W., Kisner, R.A., Klein, M.B., & Pouet, B. In-Process Detection of Weld Defects Using Laser-Based Ultrasound. United States.
Bacher, G.D., Kercel, S.W., Kisner, R.A., Klein, M.B., and Pouet, B. Sun . "In-Process Detection of Weld Defects Using Laser-Based Ultrasound". United States. https://www.osti.gov/servlets/purl/10335.
@article{osti_10335,
title = {In-Process Detection of Weld Defects Using Laser-Based Ultrasound},
author = {Bacher, G.D. and Kercel, S.W. and Kisner, R.A. and Klein, M.B. and Pouet, B.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}

Conference:
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