PURPOSE: To favorably detect a flaw not only on a flat part of the surface of an article to be inspected but also an irregular part by vertically sliding an ultrasonic probe and by pressing the probe on the surface of the article to be inspected.
CONSTITUTION: An ultrasonic probe 2 is held on a unit with a cover 4 and a holder 6, and repulsion by compression of a spring 3 provided between a spring receiver 7 and the cover 4 of the probe 2 presses the probe 2 onto an article to be inspected 1 so that it follows the irregularity of the article to be inspected 1. A supply port 1 facilitates inflow and holding by a groove 10 of a contact medium led to the neighborhood of the probe 2, a key 5 stops rotation of the probe 2 in the radial direction with combination with a key way of the holder 6 and enables vertical sliding. Also, a shoe 9 whose contact face is machined according to the piping diameter of the article to be inspected 1 facilitates mounting on the piping. Thus, the probe 2 is made into a unit, and a pressing force, inclination of the contact face and contact medium supply amount can be made as prescribed by pressing with the spring, etc., and then, ultrasonic flaw detection can be done favorably even on the irregular face of the article to be inspected 1.
AIZAWA TSUGUNORI
KAKINUMA YUKIO
HITACHI ENG CO LTD
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