Common and important problems associated with the welding of large structures are induced distortion and residual stresses, both difficult to simulate accurately given the intensive computational demands of such severely nonlinear processes. In this paper, temperature distribution and variation of stresses and deformations in welding of a thick plate flange have been evaluated by using a three dimensional (3D) model. For modeling of molten puddle motion (speed of welding) in numerical model, birth and dead element method have been employed. By using 3D nonlinear-transient-heat flow finite element analysis, temperature distribution versus time, during welding and after cooling, is obtained. Then by applying these results and viscoplastic condition (Anand viscoplastic model), stress distribution during welding and residual stresses and final deformations are determined.

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