Preparation method of fatigue specimen containing high-value welding residual stress

The invention discloses a preparation method of a high-value residual stress-containing welding member fatigue specimen. The preparation method comprises the following steps: measuring the residual stress of an actual welding structure of a specimen member as a specimen test result; performing three-dimensional modeling and finite element analysis on the sample component to obtain a sample simulation result of the residual stress of the sample component, and verifying the precision of a sample simulation model; setting different segmentation widths for the sample simulation model, cutting the sample simulation model into components with different width-to-thickness ratios, and measuring the residual stress of the components, so as to obtain a plurality of residual stress test results of the cut components; performing unit grid removal operation on the simulation model, performing simulation cutting to obtain a simulation residual stress result, comparing the simulation result with a corresponding test result,