PURPOSE: To perform the accurate inspection of a welded part, by a method wherein a delay time is changed before and after the delay time determined by the outer diameter, wall thickness and desired angle of refraction of a steel pipe to transmit and receive an ultrasonic wave and the delay time of the reflected wave from a welding bead tow is fixed to perform oblique angle flaw direction.
CONSTITUTION: In order to perform the flaw detection of welding bead tows 21, 23, an angle of refraction is set to θ, the wall thickness of a steel pipe to (t) and the outer diameter thereof to R to calculate the position of a probe 10. After the setting of R, (t) and θ, a predetermined angle Δθ is added to and subtracted from θ to set θ+Δθ to a flaw detection range and the delay time to θ+Δθ is calculated and an ultrasonic wave is altered from the min. delay time to the max. delay time in said flaw detection range. Because a reflected wave is obtained when the tow 21 or 23 is aimed, said reflected wave is taken in as the output of D/A converter 36 and a calculator 30 fixes the angle of refraction to an angle θ' when the reflected wave was obtained. The non-circularity of the steel pipe is not always change and the distance between the start and final ends of the steel pipe may be regarded to be constant. Flaw detection is similarly carried out with respect to welding bead tows 22, 24 by a probe 10'.
| JPS60102666 | [Title of the device] Detecting device |
| JPS59132357 | ULTRASONIC FLAW DETECTION OF ANGULAR BILLET |
SUGIMOTO TAKAO
MUROTA SHOJI
| JPS59216051A | 1984-12-06 |
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