THE CONTROVERSY OVER THE CHOICE OF A GOOD RADIOGRAPHIC TECHNIQUE FOR WELD RADIOGRAPHY
R. Halmshaw
49 Crouch Croft, London SE9 3HX, UK
Keywords: Structural integrity, maintenance, Fracture mechanics, Flaw
ABSTRACT The decision to produce new European Standards in NDT, to replace all relevant national standards in the member countries has highlighted major differences in these national standards and also in other standards used in countries outside the European Community. These differences are particularly fundamental in standards for weld radiography on film and will be discussed and analysed. The author believes that film unsharpness, film granularity and film contrast are three separate fundamental properties of radiographic film which have varying importance in the values of flaw sensitivity which can be obtained with different energies of X-rays which are used in industrial radiography, i. e. from 50 keV to 30 MeV. Some well known standards appear to ignore this. The relative importance of other technique parameters will be discussed and a recommended standard designed to produce good flaw sensitivity will be outlined.
Publication Source: Trends in NDE Science & Technology; Proceedings of the 14th World Conference on Non-Destructive Testing, New Delhi, 8-13 December 1996.Vol. 1, pages 99 - 104
Publisher: Ashgate Publishing Company
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