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The selection of ultrasonic transducers for inspection of pipeline girth welds. Vol. 3. Evaluation of the pitch-catch technique for examination of the body region

Technical Report:

Abstract

Research was conducted to develop an ultrasonic inspection design for the nondestructive evaluation of pipeline girth welds made by the mechanized gas metal arc (GMA) welding process for onshore and offshore pipeline construction. This report describes the work carried out to evaluate the performance to the pitch-catch technique with respect to its ability to examine the body region of mechanized GMA welds in 19.5 mm thick material. Evaluation of the pitch-catch technique was carried out on simulated and real weld defects. Results show that an inspection design method and criteria can be specified for the detection of lack of sidewall fusion defects in the body region of mechanized GMA welds. The criteria specified a pitch-catch technique using a 2.25 MHz 45{degrees} transmitter and a 2.25 MHz 55{degrees} receiver probe. A single pair of these transducers can inspect wall thickness from 9.7 mm to 23.0 mm. The pitch-catch technique evaluated on 19.5 mm wall thickness materials demonstrated that the detection goal of projected depth with a signal-to-noise ratio of greater than 12dB could be met, and that no problems occurred with false indications or missed defects. High sensitivities to small defects in the body region were obtained using a single pair  More>>
Publication Date:
Oct 01, 1988
Product Type:
Technical Report
Report Number:
NOVA-15048; MICROLOG-90-01202
Reference Number:
CANM-90-005430; EDB-90-095192; ERA-15-035297
Subject:
42 ENGINEERING; PIPELINES; INSPECTION; WELDED JOINTS; ULTRASONIC TESTING; GAS METAL-ARC WELDING; PERFORMANCE TESTING; TRANSDUCERS; ACOUSTIC TESTING; ARC WELDING; FABRICATION; JOINING; JOINTS; MATERIALS TESTING; NONDESTRUCTIVE TESTING; TESTING; WELDING; 420205* - Engineering- Transport & Storage Facilities- (1980-)
OSTI ID:
6834625
Research Organizations:
Metals Technology Labs., Ottawa, ON (Canada); Nova, an Alberta Corp., AB (Canada)
Country of Origin:
Canada
Language:
English
Other Identifying Numbers:
Other: CNN: OSQ82-00244
Availability:
PC Canada Centre for Mineral and Energy Technology, Technical Information Division, 562 Booth St., Room 20-C, Ottawa, ON, CAN K1A 0G1; MF CANMET/TID, Energy, Mines and Resources Canada, 555 Booth St., Ottawa, Ont., Canada K1A 0G1.
Submitting Site:
CANM
Size:
Pages: (49 p)
Announcement Date:

Technical Report:

Citation Formats

Glover, A G, Fingerhut, M P, and Dorling, D V. The selection of ultrasonic transducers for inspection of pipeline girth welds. Vol. 3. Evaluation of the pitch-catch technique for examination of the body region. Canada: N. p., 1988. Web.
Glover, A G, Fingerhut, M P, & Dorling, D V. The selection of ultrasonic transducers for inspection of pipeline girth welds. Vol. 3. Evaluation of the pitch-catch technique for examination of the body region. Canada.
Glover, A G, Fingerhut, M P, and Dorling, D V. 1988. "The selection of ultrasonic transducers for inspection of pipeline girth welds. Vol. 3. Evaluation of the pitch-catch technique for examination of the body region." Canada.
@misc{etde_6834625,
title = {The selection of ultrasonic transducers for inspection of pipeline girth welds. Vol. 3. Evaluation of the pitch-catch technique for examination of the body region}
author = {Glover, A G, Fingerhut, M P, and Dorling, D V}
abstractNote = {Research was conducted to develop an ultrasonic inspection design for the nondestructive evaluation of pipeline girth welds made by the mechanized gas metal arc (GMA) welding process for onshore and offshore pipeline construction. This report describes the work carried out to evaluate the performance to the pitch-catch technique with respect to its ability to examine the body region of mechanized GMA welds in 19.5 mm thick material. Evaluation of the pitch-catch technique was carried out on simulated and real weld defects. Results show that an inspection design method and criteria can be specified for the detection of lack of sidewall fusion defects in the body region of mechanized GMA welds. The criteria specified a pitch-catch technique using a 2.25 MHz 45{degrees} transmitter and a 2.25 MHz 55{degrees} receiver probe. A single pair of these transducers can inspect wall thickness from 9.7 mm to 23.0 mm. The pitch-catch technique evaluated on 19.5 mm wall thickness materials demonstrated that the detection goal of projected depth with a signal-to-noise ratio of greater than 12dB could be met, and that no problems occurred with false indications or missed defects. High sensitivities to small defects in the body region were obtained using a single pair of pitch-catch probes that inspected the body region as a single plane. 4 refs., 14 figs., 6 tabs.}
place = {Canada}
year = {1988}
month = {Oct}
}