Microdefects as indicator of steel wire quality

Abstract

AbstractThe aim of our work was to create non‐destructive methods of testing steel wire straightness while the wire is being produced. We made a conclusion about the reasons of bending moment appearance. The asymmetry in the density of microcracks on the left and right of the axis of symmetry of the wire leads to the asymmetry of stress in the met al. Also, asymmetry of stress could be the consequence of different mechanical properties of different section of steel wire. This difference in mechanical properties could be the consequence of different concentration of micro defects. Another possible reason of this effect could be the difference in chemical composition of neighbouring wire arrears. So, it was necessary to construct simple devise, which could indicate all that factors. It was suggested to measure the concentration of microcracks by indirect method. The concentration of microcracks affects the number of physical properties of the met al. First of all they are electrical conductivity and magnetic properties. We decide that the simplest solution is to control the asymmetry of stress in the wire by the asymmetry of the magnetic properties of the wire. The devise for such control was developed. This devise contains the magnetizing node, measuring node with magnetic sensors and signal processing unit. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)