A three dimensional finite element model of T type welding of thin plates was established based on ABAQUS software, the Goldak double-ellipsoid moving heat source model and the sequential coupling calculation of thermo-elastic,plastic mechanics were used, the welding residual stress, temperature field and deformation of T type welding of thin plates were obtained. In order to verify the validity of numerical calculation method, the T type bilateral welding experiments of Q235 steel thin plates were carried ...