Conducting secondary development on CAE software for post-processing stands as an efficacious approach to evaluate fatigue strength in welded frames of railway vehicles.This paper presents a fatigue strength evaluation program for welded frames,em-ploying ABAQUS as the platform and utilizing Python language along with the ABAQUS/GUI toolkit.This program is devised to rapid-ly extract data from result files,process them,establish local coordinate systems of base metal and welds,and generate comprehensive material utilizations at evaluation points in the local coordinate systems based on the DVS 1612 standard,and write them into result files,enabling rapid analysis and visualization of fatigue strength in welded frames.The proposed approach offers an efficient and feasible way for evaluating fatigue strength in welded frames.This study provides valuable insights for extending the applications of ABAQUS secondary development for post-processing in other domains.