Residual Stress Fields due to Varying Tack Welds Orientation in Circumferentially Welded Thin-Walled Cylinders. (10th September 2008)

• Record Type: Journal Article
• Authors: Qureshi, E. M.; Malik, A. M.; Dar, N. U.
• Other Names: Xi Fengfeng (Jeff) Academic Editor.
• Is Part Of: Advances in mechanical engineering. Volume 2009(2009)
• Publication Date: 2008-09-10
• Subjects: Mechanical engineering -- Periodicals; 621.05
• DOI: 10.1155/2009/351369
• Languages: English
• ISSNs: 1687-8132

Abstract

Abstract : The local, nonuniform heating and subsequent cooling during the welding processes causes complex thermal stress/strain fields to develop that finally leads to residual stresses, distortions, and their adverse consequences. Residual stresses are of prime concern to the industries producing weld-integrated structures around the globe because of their obvious potential to cause dimensional instability in welded structures, contribute to premature fracture/failure, along with the significant reduction in fatigue strength and in-service performance of the welded structures. Arc welding with single or multiple weld runs is an appropriate and cost effective joining method to produce high-strength structures in these industries. A multifield interaction in arc welding process makes it a complex manufacturing process. A number of geometric and process parameters are contributing to significant stress levels in arc-welded structures. In the present analysis, parametric studies are conducted for the effects of a critical geometric parameter, that is, tack weld on the corresponding residual stress fields in circumferentially welded thin-walled cylinders. Tack welds offer a considerable resistance to the shrinkage and the orientation, and size of tacks can alter altogether the stress patterns within the weldments. Hence, a critical analysis for the effects of tack weld orientation is desirable.