Ultrasonic weld testing and imaging using portable automated arm

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Authors
  1. Chahbaz, A.
  2. Cyr, A.
  3. Sicard, R.
  4. Pelletier, A.
  5. Brassard, M.
  6. Matthews, J.R.
Corporate Authors
Tektrend International Inc, Montreal QUE (CAN);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Automated and manual ultrasonic techniques are rapidly becoming as popular as conventional radiographic techniques for weld testing applications. However, for automated ultrasonic techniques, inspection cycle time and defect/data interpretation represent important factors. In this work, we describe the use of portable automated PC-based ultrasonic scanner to inspect simulated and real naval construction welds. The system is a self-contained single unit in which all electronic boards are mounted in the system server workstation. The system offers advanced analysis and interpretation capabilities, and can display the raw and interpreted inspection results in a realistic 3D representation. We also examine the resulting scan images from two inspection setups used to improve inspection reliability and defect interpretation in terms of detectability of weld defects. We then averaged and reconstructed the images using a Syntactic Aperture Focusing Technique SAFT technique with an attenuation correction factor introduced to improve resolution for long propagation paths. The Syntactic Aperture Focusing Technique (SAFT) makes it possible to increase the signal-to-noise ratio by averaging several shifted reflections from the same defect point. Lateral resolution is therefore improved, especially for long probe-to-defect distances. TRUNCATED
Keywords
Acceptance tests;Computer aided ultrasonics;Defect condemnation
Report Number
DREA-SR-2001-094-SES-VII-PAP-32 — Special Report
Date of publication
01 Oct 2001
Number of Pages
11
DSTKIM No
CA011869
CANDIS No
516447
Format(s):
Hardcopy;Document Image stored on Optical Disk

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