On the estimation of defects developments at radiographic testing of welded joints

Equations for estimation of the detectability of volumetric and plane defects of arbitrary size, form, depth of occurrence and orientation in a weld are derived. Technique proposed for estimation permits to determine for revealing specific defects the critical values of their parameters in the whole range of welded joints thickness under radiographic testing. At that, it makes it possible to assess separately the degree of effect of main radiographic factors on the defects detectability, in particular of visual differentiation ability of defects images on radiograph and of scattered radiation. Results of estimations and experimental investigations of defects detectability in radiographic testing of welded joints are presented