Method for creating two-dimensional inherent strain library of electric arc welding process

The invention discloses an arc welding process two-dimensional inherent strain library creating method which comprises the following steps: determining arc welding process parameters and the cross section size of a two-dimensional droplet weld on a weldment, and calculating the length of a molten pool; according to the heat space distribution of the arc heat source, the temperature-related material density and the specific heat, iterative calculation is conducted till heat balance is achieved, and the temperature distribution of the two-dimensional molten drop welding seam and the heat affected zone during arc heating is obtained; establishing a two-dimensional grid model, and performing heat transfer and solid-liquid phase change calculation to obtain solid-liquid distribution at different moments; carrying out residual solid thermal expansion calculation and weldment shrinkage calculation according to the two-dimensional grid model of the welding seam and the local weldment to obtain expansion deformation a