Abstract. The aim of this study is to determine the influence of design factors of butt-welded sheet joints on the level of elastic stress concentration in joints. The finite element method was used to model the stress-strain state in the zones of constructive concentration of butt sheet joints with double-sided seams. The design model simulated the form of the joint in all the elements since the distribution of stresses and strains in the cross section depends on the joint configuration. The following parameters for butt sheet joints such as sheet thickness, the width of the joint, the bead width and bead height in butt welding joints were varied in the study. A nonlinear model was used to approximate the values of the elastic stress concentration factors obtained for different values of the geometric parameters for butt-welded sheet joints. This model is in good agreement with the values of the elastic stress concentration factors in the transition zone between the weld seam and base metal obtained by the stress-strain state modelling in joints with the help of FEM (the coefficient of determination R 2 ≥0.856).