The main goal of the article is to identify artificially created defects like lack of fusion and incomplete penetration in butt weld joint using non-destructive volumetric methods. These defects are the most serious defects in welds of steel constructions from the safety point of view. For identification. an ultrasonic phased array technique and a conventional X-ray using digital imag... https://qnvzwdpf45e9sh.timeblog.net/70688064/analytical-examination-of-alcohol-based-hand-disinfectants-in-our-country-and-evaluation-with-respect-to-covid-19-pandemic