Article Article
Ultrasonic Multiple Beam Technique Using Single Phased Array Probe for Detection and Sizing of Stress Corrosion Cracking in Austenitic Welds

This paper describes a multiple beam technique using an ultrasonic single phased array probe for detecting and sizing planar discontinuities in austenitic stainless welds. This technique uses a single phased array probe with focal laws for two kinds of sectorial scans (S-scans) separately based on transverse and longitudinal wave velocities. The transverse wave S-scan uses an angle beam transverse wave method in order to detect planar discontinuities. The longitudinal wave S-scan uses a multiple beam method to get discontinuity sizing; it is used with inside-diameter creeping waves, mode-converted waves and angle focal beam longitudinal waves. The validity of generation of multiple beams from a single phased array probe without wedges is confirmed by comparison of measurements and simulations of ultrasonic wave displacement of angle beams. The effectiveness of the multiple beam technique with a single phased array probe is presented by results from electrical discharge machined slits and stress corrosion cracks in austenitic stainless steel welds.

Davis, J. M., Advanced Ultrasonic Flaw Sizing Handbook, The Art Room Corporation, Las Vegas, Nevada, 2001. Davis, J. M., and M. Moles, “Beam Sweeping and Encoded Phased Array,” Materials Evaluation, Vol. 65, No. 6, 2007, pp. 539–541. Gendreu, P. and R. Berriet, “Impulse Diffraction in Solids Applications to Contact Phased Array,”, Vol. 3, No. 4, 1998. Miller, G. F. and H. Pursey, “The Field and Radiation Impedance of Mechanical Radiators on the Free Surface of a Semi-infinite Isotropic Solid,” Proceedings of the Royal Society of London, Ser. A, Vol. 233, 1954, pp. 521–541. R/D Tech, “Introduction to Phased Array Ultrasonic Technology Applications,” Toronto, Ontario, Canada, 2004. Royer, D. and E. Dieulesaint, Elastic Waves in Solids, Springer-Verlag, Berlin, 2000. Schmerr, L. W., Fundamentals of Ultrasonic Nondestructive Evaluation, Plenum Press, New York, 1998. Scruby, C. B. and L. E. Drain, Laser Ultrasonic, Adam Hilger, New York, 1990. Tooma, M. et al., “A New Ultrasonic Inspection Method Using Crossed Active Focus Scanning for Crack Sizing,” 3rd International Conference on Nondestructive Testing, Crete, October, 2003, pp. 140–143.
Usage Shares
Total Views
129 Page Views
Total Shares
0 Tweets
0 PDF Downloads
0 Facebook Shares
Total Usage