Scanning ultrasonic inspection method and apparatus
AssigneeBritish Steel Corporation
InventorAlexander Rankin Cornforth
Life of this patent
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Abstract
An arrangement for testing tube-like articles for defects includes scanning a defect detecting device in a helical path about the article; marking, upon receipt of defect indicative signals at the device, a pictorial record of the magnitude and position along the article of defects shown by the received defect indicative signals if they are greater than a predetermined magnitude; subjecting received defect indicative signals greater than said predetermined magnitude to predetermined repetition tests; and marking on the pictorial record the circumferential position about the article of defects shown by the received defect indicative signals if they satisfy the predetermined repetition tests.
Claims17
Apparatus for testing elongate articles for defects comprising a defect detecting device adapted for helical scanning about the article to be tested;
- means for marking, upon receipt of defect indicative signals at the device, a pictorial record of the magnitude and the position along the article of the defects shown by the received defect indicative signals;
- means for applying to defect indicative signals, if they are greater than a predetermined magnitude, predetermined repetition tests;
- and means for marking on the pictorial record the radial position about the article of defects shown by the received defect indicative signals if they satisfy the predetermined repetition tests.
A method of testing elongate articles for defects comprising scanning a defect detecting device in a helical path about the article;
- marking, upon receipt of defect indicative signals at the device, a pictorial record of the magnitude and position along the article of defects shown by the received defect indicative signals;
- subjecting received defect indicative signals, if they are greater than a predetermined magnitude, to predetermined repetition test;
- and marking on the pictorial record the radial position about the article of defects shown by the received defect indicative signals if they satisfy the predetermined repetition tests.
A method of testing a tube for defects comprising scanning a plurality of ultrasonic testing probes in a helical path about the tube;
- using the probes to transmit a plurality of ultrasonic pulses into the tube and to receive from the tube defect indicative echoes of the pulses from the tube;
- testing whether defect indicative echoes are received from pulses transmitted by a predetermined number of probes during successive scanning movements past the same circumferential position about the tube;
- and providing an output signal if they are.
Dependencies are inferred from the claim text.