The safety of air transportation partly lies in Non Destructive Inspection. From the titanium production to final manufactured parts exploitation, the use of defect fre materials has to be guaranteed. In this scope, CEZUS has run research and development on Ultrasonic Inspection of large diameter forged bars. The paper will show how, progressively, improvements of methods led to the detection of flat bottom holes, the diameter of which decreasing from 1.2 mm to 0.8 mm for the same inspected billet. The improvement of the conventional procedure was to increase the signal to noise ratio in the case of alpha+beta type titanium alloys, which exhibit a rather high noise level. This has been obtained perfecting methodology and means in collaboration with FRAMATOME. With these new techniques, the signal to noise ratio is twice larger than the conventional one, and the detection of Flat Bottom Holes 0,8 mm is possible with similar confidence level. These methods, associated with the achievement of homogeneous microstructures throughout the large forged bar diameter, makes the ultrasonic inspection easy and reliable.
Ultrasonic inspection of titanium billets
Ultraschalluntersuchung von Titanbrammen
Science and Technology, Titanium, World Titanium Conference, 7 ; 3 ; 2859-2865
1993
7 Seiten, 6 Bilder
Conference paper
English
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