Abstract: V-groove multi-layer and multi-pass welding model of 2205 dual phase steel pipeline was established by using the SYSWELD finite element software, and the temperature field and welding residual stress distribution of the 2205 dual phase steel pipeline joint were simulated with the thermo-elasto-plastic finite element method. During the calculation of temperature field, a double ellipsoidal heat source model was adopted, and the heat source model was verified by experiments. The results show that the post welding residual stress of the pipeline is concentrated in the weld and nearby heat affected zone; the axial and circumferential residual stresses are distributed on the outer, inner and middle surfaces of the pipe wall. The axial residual stress presents the distribution mode of "tension-compression-tension" in the radial direction of each section of the pipeline. The circumferential stress of outer surface of the pipe is mainly high tensile stress at the 0° section, and the tensile stress at other sections is lower. The circumferential stress of inner surface of the pipe is mainly tensile stress at the weld seam. The tensile stress increases from 0° section to 270° section, and the tensile stress zone also increases.