Prediction and experimental validation of penetration depth of butt welds in thin plates using superimposed laser sources》.pdfVIP

NDTE International 50 (2012) 10–19 Contents lists available at SciVerse ScienceDirect NDTE International journal homepage: /locate/ndteint Prediction and experimental validation of penetration depth of butt welds in thin plates using superimposed laser sources Tsun-Yen Wu, I. Charles Ume n G.W.Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA a r t i c l e i n f o a b s t r a c t Article history: In this paper, a methodology to measure penetration depth of butt welds in thin plates using laser Received 11 May 2011 generated ultrasounds is presented. The superimposed line sources (SLS) technique is used to generate Received in revised form narrowband ultrasounds. The signal processing procedure that combines wavenumber-frequency (k-o) 21 March 2012 domain filtering and synthetic phase tuning (SPT) is used to reduce the complexity of Lamb wave Accepted 11 April 2012 signals. The reflection coefficients for different wavelengths corresponding to each wave mode are Available online 21 April 2012 calculated. Cutcheck inspection is performed and critical dimensions of weld such as penetration depth, Keywords: reinforcement height and bead width are measured. Regression analysis that includes stepwise Lamb waves regression and corrected Ak