RESIDUAL STRESS DISTRIBUTION FOR A SINGLE PASS WELD IN PIPE
محتوى المقالة الرئيسي
الملخص
Heat input due to the welding of mild steel pipe causes a temperature gradient in the parent metal. After welding and temperature cooling down, residual stresses appear around welding zone which reduces the weld strength. Residual stresses are a result of the temperature gradient and the dependency of material properties on the temperature, such as yield strength, elasticity modulus, and thermal expansion coefficient.
In this study, a typical flat joint of a single pass weld in a thin pipe was studied analytically and numerically. Analytical approach is performed by exploring a simple method to calculate the magnitude of residual stress in terms of the weld shrinkage behavior. Numerical analysis is performed by applying non-linear transient heat transfer analysis using welding parameters, such as heat generation, free or force convection with ambient, are performed using a general purpose FE package ANSYS 8.0 in order to obtain the temperature distribution in the welded parts. A non-linear thermal-elastic-plastic stress analysis is then performed using the same package to predict the stress fields during and after welding.
تفاصيل المقالة
كيفية الاقتباس
تواريخ المنشور
المراجع
Brown S. and Song H., "Finite element simulation of welding of large structures", Vol.114, November 1992.
Erika Hedblom, " Multipass welding of nuclear components-computations ", Lulea University of Technology, Department of Applied Physics and Mechanical Engineering, Division of Computer Aided Design, 2002.
Koichi Masubuchi, " Analysis of welded structures (residual stresses, distortion, and their consequences), 1980.
Meo M. and Vignjevic R., "Welding simulation using FEA ", College of Aeronautics, Cranfield University, Bedford, UK, MK430AL,2003.
Norman Eaton, "Welding in energy-related projects ", Welding Institute of Canada, 1984.
Panagiotis Michaleris, "Residual stress distributions for multi-pass welds in pressure vessel and piping components ", Edison Welding Institute, Columbus, 1997.
Timoshenko S. and Woinowsky-Krieger S., "Theory of Plates and Shell", second edition, McGraw-Hill, 1959.
Wu A., Syngellakis S., and Mellor B.G., "Finite Element Analysis of Residual Stresses in a Butt Weld", University of Southampton, High field, U.K, 2001.