G - Physics – 01 – N
Patent
G - Physics
01
N
349/44
G01N 29/04 (2006.01) G01N 29/34 (2006.01)
Patent
CA 1226933
ABSTRACT OF THE DISCLOSURE An ultrasonic flaw detection method in which cold weld defects in the weld zone of an electric resistance welded steel pipe are detected by pro- jecting an ultrasonic wave (a) having a frequency range of from 25 MHz to 500 MHz and an angle of incidence of from 0° to 12° onto the weld zone of the pipe, and by projecting another ultrasonic wave (b) having a frequency of from 2 MHz to 10 MHz and an angle of incidence of from 15° to 27° onto the same weld zone.
471114
Fukuda Shinichi
Ikemoto Takeshi
Kajiyama Masaki
Fetherstonhaugh & Co.
Nippon Steel Corporation
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