A study on the mechanical behaviors in welded parts by numerical simulation

At present, welding is being considered as the most useful method to assemble the steel structures. But, the process can produce the mechanical defects such as welding residual stresses and welding deformations, which have a great influence on the structural instability in welded parts necessarily. It is important to accurately predict these characteristics including distribution of temperature during welding in order to evaluate the mechanical behaviors in welded parts; however, the experimental methods to clarify the characteristics have the practical limitations. From these reasons, a numerical simulation may be attractive for the purpose of solving these problems. In this paper, authors introduce the various examples of numerical analysis to the welded parts considering the moving effect of heat sources and the temperature dependency of material by the finite element method (un-stationary heat conduction & thermal elasto-plastic analysis).