Residual Stresses Measurement in the Weld Seam of X70 Steel, Analyzed by XRD

Determination of residual stresses in the welded areas of metal structures is a very important operation in the mechanical construction and other fields, for the reliability and sustainability of these metal structures [J.B. Ju, S.K. Lee, J. Jang, W.S. Kim, D. Kwon, Int. J. Press. Vessels Piping 80, 641 (2003)]. Over the past few years, a significant number of studies have been carried out in order to understand the influence of residual stresses on the assembly by welding, from the standpoint of mechanical properties and corrosion resistance [E. Macherauch, K.H. Kloos, Residual Stresses in Science and Technology, DGM Inform. Verlag, 1987, p. 3; P.J. Withers, H.K.D.H. Bhadeshia, Master Sci. Technol. 17, 366 (2001)]. Several studies have been carried out for the purpose of finding non-destructive methods for the evaluation of the residual stress [H. Nasri, Mesure De Contraintes Résiduelles Dues Au Soudage Et Au Soudage-Martelage Par Micro-Profil De Surface, Ecole De Technologie Supérieure Université Du Québec, 2007; C. Balasingh, A.K. Singh, Metals Materials Proc. 12, 269 (2000)]. One of the methods that proved important, it is that of sinψ². In this work we have applied this method in the assessment of the residual stress in the welded X70 steel.