Abstract: A calculating process for analyzing temperature field and residual stresses in the butt weld in steel plates used for ship manufacturing has been presented. Present study is based on software ANSYS 9.0 and includes 3-dimensional uncoupled heat-mechanical model and analytical field stress 2-dimensional model using programming software MATLAB 7.1 and the method of advanced elastic. The model of finite element was used in order to evaluate temporary stresses and residual stresses of the weld. At first, 3-dimensional model is developed in order to study temperature field and residual stresses. Then 2-dimensional model was used in order to study temperature cycle and welding residual stresses. Using the 2-dimensional model can save in much time of calculation. In this research testing results of reference were used to show accuracy of models. The results of both 2 and 3-dimensional models are very good considering the test model.