Method for the ultrasonic flaw detection of an electric welded p

Details Method for the ultrasonic flaw detection of an electric welded p Method for the ultrasonic flaw detection of an electric welded p

1984-12-28

1986-12-09

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73638, G01N 2904

Patent

active

046272895

ABSTRACT:
An ultrasonic flaw detection method in which defects in the weld zone of an electric resistance welded steel pipe are detected by projecting an ultrasonic wave (a) having a frequency range of from 25 MHz to 500 MHz at an angle of incidence of from 0.degree. to 12.degree. onto the weld zone of the pipe. In addition by projecting another ultrasonic wave (b) having a frequency of from 2 MHz to 10 MHz at an angle of incidence of from 15.degree. to 27.degree. onto the same weld zone enables discrimination between cold weld defects and other defects such as inclusions and penetrators.

REFERENCES:
patent: 3302453 (1967-02-01), Wood et al.
patent: 4375165 (1983-03-01), deSterke
patent: 4406167 (1983-09-01), Maeda
patent: 4531409 (1985-07-01), Koch et al.

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