Ultrasonic inspection of the root region of girth welds
- Atomic Energy of Canada Ltd., Chalk River, ON (Canada). Chalk River Nuclear Labs.
This is the final report to the American Gas Association for project PR-166-710. The objective of this contract was to identify improved ultrasonic inspection techniques for the root region of pipeline girth welds during construction. The improved inspection techniques had to be able to detect serious planar defects but not call for repairs on welds because of weld profile features such as misalignment (hi/lo). Two ultrasonic inspection techniques were identified that could characterize weld defects. The first, called the Dual Probe Technique, was developed as part of this contract. This technique was first identified by computer modelling, tested using the computer model, then evaluated in the laboratory. The results indicated that the Dual Probe Technique could be implemented as part of an automated inspection system and that it can detect planar defects in the presence of hi/lo. The second technique, called Time of Flight Diffraction, was developed in the mid 1970's to inspect thick wall pressure vessels in the nuclear industry. This technique was tested by computer simulation. The results showed that the technique could be extended to detect planar defects in the root region of pipeline girth welds. 5 refs., 15 figs.
- Research Organization:
- American Gas Association, Inc., Arlington, VA (USA). Pipeline Research Committee; Atomic Energy of Canada Ltd., Chalk River, ON (Canada). Chalk River Nuclear Labs.
- Sponsoring Organization:
- AGA; American Gas Association, Inc., Arlington, VA (USA)
- OSTI ID:
- 5628857
- Report Number(s):
- AGA-91014480
- Country of Publication:
- United States
- Language:
- English
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