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In designing primary circuits, it is standard practice to create a bored-out section in the piping both upstream and downstream of the welded seam known as a counterbore. The aim of the experiments described is to check precisely the influence of the counterbore on the detection of known artificial flaws such as simulated fatigue or corrosion cracks, as various parameters are changed. The results show a counterbore machined with sharp edges can under certain circumstances give rise to the creation of shear forces which may lead to the formation of cracks. A very accentuated counterbore may also have a negative influence on the interpretation of the ultrasonic results and lead to incorrect evaluations.

Additional information

Authors: VOLCAN A, JRC Ispra (IT)
Bibliographic Reference: EUR 15372 EN (1993) 16 pp., FS, free of charge
Availability: Available from Joint Research Centre, Publication Department, I-21020 Ispra (Va.) (IT)
Record Number: 199511591 / Last updated on: 1995-12-12
Original language: en
Available languages: en
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