NDTnet - April 1996, Vol.1 No.04

Ultrasonic testing and image processing for in-progress weld inspection *

by Shaun Lawson

© Download: ut_tofd.exe 88 kbyte

Abstract

Ultrasonic methods are widely used in the non-destructive testing of all manner of welded joints. However, due to the practical difficulties involved in the NDT of incomplete or hot welds, much of this testing is undertaken after a joint is completed. Alternatively, if defects could be detected between weld runs then potentially large cost savings would result from reduced wastage of materials and gouging/repair times. In addition, if the NDT results could be interpreted fast enough (e.g. by an automated system) then weld process control may also be possible. This short artcicle describes some of the problems to be encountred when using pulse echo methods for flaw detection in incomplete welds. As an alternative, Time of Flight Diffraction methods are proposed and image processing techniques for automatic defect detection are described.



Author

S.Lawson</A Shaun Lawson
Shaun Lawson has worked in the field of computer vision in automatic inspection for 5 years. During this time he has worked both in industry (for Royal Ordnance plc, investigating the automation of industrial radiographic inspection cycles) and in academia. He is currently employed as a research officer at the University of Surrey in the UK where he is about to submit his PhD on image segmentation and neural networks applied to non-destructive testing.
E-mail:
s.lawson@surrey.ac.uk
WWW: http://robots.surrey.ac.uk/People/mes3sl/mes3sl.html
*This work is funded by the European Commission under the BRITE-EURAM II programme (project no. 5907).
The BRITE-EURAM project NDT Methods for Flaw Detection During Welding


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Rolf Diederichs 1.April.1996, info@ndt.net
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