Provided is an ANSYS-based duplex stainless steel and dissimilar steel welding deformation prediction method, comprising the following steps: (1) determining welding process parameters; (2) establishing a finite element model and performing grid partitioning; (3) determining thermal physical parameters of a welding material; (4) determining a heat source model; (5) calculating a temperature field; and (6) calculating a stress field, and working out the welding deformation of a duplex stainless steel and a dissimilar steel. Compared with the prior art, the present invention successfully predicts the deformation after the welding of SAF2507 super duplex stainless steel and Q235 low-carbon dissimilar steel. A thermal treatment scheme after the welding can be formulated according to the prediction result, reducing the number of welding process experiments, saving manpower and material resources, providing technical specifications for previous lofting and feeding procedures in the process of manufacturing a product, and reducing the workload of a later machining procedure.
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