Published in Russian Journal of Nondestructive Testing
AbstractThe purpose of this article is to determine the mathematical function of the optical behavior of radiographic films/images produced by gamma-ray radiography of the steel pipes. In order to achieve this goal, we used realistic films for welding tests on the oil and gas pipelines in the operational areas. Eight films were selected in each, th...
Published in Russian Journal of Nondestructive Testing
AbstractOne of the most prevalent problems in grinding nickel-based super alloys is grinding wheel loading phenomenon which is the chip accumulation in free inter granular spaces between grains or micro-clogging on active vertices of abrasive grains. This research work studies the efficiency of acoustic emission signals in order to measure the grin...
Published in Russian Journal of Nondestructive Testing
AbstractLongitudinal and shear ultrasound pulse velocity (UPV) were measured in concrete under tensile stresses. 17 beams made of 7 mixtures were tested under flexural tensile loading until failure while UPVs were recorded. At low stresses, before 30% of the maximum tensile stress, mixtures showed acoustoelastic response, with linear UPV variation ...
Published in Russian Journal of Nondestructive Testing
AbstractA procedure has been developed to detect surface defects in the head and foot of a rail using a magnetic method involving thin-film magnetoresistive field sensors. The setup consists of a system for moving the rail in the longitudinal direction, a magnetizing solenoid, cartridges with field sensors for inspecting the rail head and foot, a D...
Published in Russian Journal of Nondestructive Testing
AbstractSystems for nondestructive testing (NDT) of rails are multichannel and concurrently use several methods, including ultrasonic, magnetic flux leakage (MFL), visual, and others. Periodic inspection of rails does not allow easily monitoring the condition of rails and tracking the trend in the development of defects simultaneously through multi...
Published in Russian Journal of Nondestructive Testing
AbstractWe present calculations of the dependences of the electric voltage \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$U\left( H \right)$$\end{document} across a ma...
Published in Russian Journal of Nondestructive Testing
AbstractIt is noted that the ultrasonic testing of products made of complex structured materials is based, as a rule, on spatiotemporal signal processing, using ultrasonic antenna arrays to extract useful echo signal from pattern noise. If the product has a nonplanar surface, one should use a synthesized aperture antenna, which is a double crystal ...
Published in Russian Journal of Nondestructive Testing
AbstractA procedure is proposed for rejecting girth welds based on an analysis of the main parameters of acoustic emission (AE) signals recorded during multiple-pass welding. The accuracy of locating AE signals recorded from defects and their filtering from noise and interference were ensured by the use of a modified tabular method and rejection gr...
Published in Russian Journal of Nondestructive Testing
AbstractHydrogen saturated samples of technically pure titanium have been studied by the electron-positron annihilation method (EPA), coupled with the thermoelectric power measurements performed in these samples saturated by different amount of hydrogen. The structure of the hydrogenated samples was additionally investigated by X-ray diffraction. T...
Published in Russian Journal of Nondestructive Testing
AbstractFriction stir welding of pipes is gaining research interest as it delivers high performance weld joints when compared to fusion welding techniques. Mechanical testing of such welded pipes will yield only results about mechanical behaviour but cannot detect the defects. An attempt has been made in employing non-destructive techniques in anal...
