10.14489/td.2014.12.pp.028-033

2014, 12 December

DOI: 10.14489/td.2014.12.pp.028-033

Gorkunov E.S., Zadvorkin S.M., Putilova E.A.
APPLICATION OF MAGNETIC NDT METHODS TO EVALUATE THE STRESS-STRAIN STATE OF THE INDIVIDUAL ZONES OF WELDED JOINTS
(pp. 28-33)

Abstract. An extensive network of trunk pipelines, existing and under construction, working under hard environmental conditions necessitates the development of non-destructive testing techniques to be applied to diagnosing a current state of pipes and welded joints in the process of production and use. This paper reports on the results of the microstructural analysis and the study of the mechanical and magnetic properties of the different zones of welded joints (base metal, heat-affected zone material and weld material) in tube steels Х70 and Х80 made by controlled rolling. The effect of various loading conditions on the magnetic characteristics of the metals of the three zones is studied. Magnetic parameters uniquely characterizing the variation of the stress-strain state of the individual zones of a welded joint (the weld, the heat-affected zone, the base metal) in a certain range of applied stresses have been ascertained.

Keywords: Pipe steels, welded joint, stresses, strain, magnetic testing, coercive force, residual induction, maximum magnetic permeability.

+ - About the Authors Click to collapse

E. S. Gorkunov, S. M. Zadvorkin, E. A. Putilova
Institute of Engineering Science UB RAS, Ekaterinburg, Russia. E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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