Nondestructive testing

Details Nondestructive testing Nondestructive testing

1987-04-17

1988-12-27

Levy, Stewart J.

Measuring and testing

Vibration

By mechanical waves

G01N 2804

Patent

active

047931850

ABSTRACT:
Electrically conductive work pieces such as steel tubes or pipes are tested by means of a transducer comprised of a row of magnetic pole pieces through which a dc flux pattern of alternating polarity and direction is set up along a line of pole extensions and through which bidirectional ac ultrasonic transmission takes place to discover defects which return ultrasonic pulses.

REFERENCES:
patent: 4312231 (1982-01-01), Kawashima et al.
patent: 4596147 (1986-06-01), Behl et al.
patent: 4602512 (1986-07-01), Kowol et al.

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