Weld joint grade evaluation method and system

The invention relates to the technical field of welding, in particular to a weld joint grade evaluation method and evaluation system. The weld joint grade evaluation method comprises the following steps: acquiring a strength evaluation result of a weld joint according to a first standard; according to the strength evaluation result, dividing a plurality of stress evaluation areas of the weld jointin combination with a second standard, and superposing all the stress evaluation areas to obtain a polishing area and a non-polishing area of the weld joint; and according to the polishing area and the non-polishing area, determining the polishing state of the weld joint and the corresponding stress bearing grade. According to the method, two different evaluation standards are combined; in the initial scheme design stage of the framework, the stress bearing grade of the weld joint can be accurately and efficiently evaluated, so that the occurrence of human intervention is reduced, and the analysis result of weld join