Rapid calculation method for mechanical property of electric arc welding structural member

The invention provides a rapid calculation method for the mechanical property of an electric arc welding structural member, which comprises the following steps: determining electric arc welding process parameters, and obtaining an inherent strain library; dividing weldment grids, defining material mechanical parameters, creating a heat affected zone node group to record all nodes of a weldment heat affected zone, and creating a welding path positioning point node group to record each positioning point on a welding path; creating a process file, and recording types and directions of welding paths of all welding seams and a welding sequence; developing an inherent strain library calling program, and interpolating inherent strain in the inherent strain library to a weldment heat affected zone node according to the coordinates of all welding seam positioning points and the coordinates of the positioning points in the inherent strain library according to a welding path and a welding sequence in a process file to s