Measuring and testing – Vibration – By mechanical waves
Patent
1979-08-06
1981-06-02
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
73622, 73 1DV, G01N 2904
Patent
active
042703891
ABSTRACT:
Method and apparatus for automatic ultrasonic flaw detection of pipe welding zones wherein the width of the weld zone is divided into a plurality of subdivisions. The ultrasonic energy received from each of the subdivisions is displayed by employing multichannel gate circuitry providing respective outputs in units of 10% of the height of the echoes in each subdivision on a cathode ray tube in synchronization with signals representative of the longitudinal and lateral position of the probes along the pipe with respect to a reference point. The height of the defective echoes in each gate are printed together with the positions of the probe. The positions of the defects are diagrammed by a computer, thereby enabling high-speed data processing of the flaw detection information, a decrease in the time for the precise flaw detection comparable to conventional manual flaw detection method and apparatus and easy determination of the flaw detection results.
REFERENCES:
patent: 2969671 (1961-01-01), Sproule
patent: 3041872 (1962-07-01), Brown et al.
patent: 3575042 (1971-04-01), Lovelace et al.
patent: 4106326 (1978-08-01), Lather et al.
V. V. Grebennikov et al., "The Sever Automatic System for the Ultrasonic Inspection of Welded Seams in Thickwalled Pipe," The Soviet Journal of Nondestructive Testing, vol. 10, No. 14, pp. 375-378, May 1975.
Matsumoto Shigeaki
Nakajima Kimio
Shiraiwa Toshio
Tomabechi Masatoshi
Yamaguchi Hisao
Ciarlante Anthony V.
Sumitomo Metal Industries Limited
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