A method for determining maximum bearing load values for metal sheet connections of metal sheets from a material quality as a function of multiple welding parameters, characterized in that the material quality is dependent on the metal sheet thickness t and the weld spot diameter dp, which applies for a material quality in a metal sheet thickness interval ( t i,t i +1), in which from head tension or shear tension data of metal sheet connections with different weld spot diameters using a linear regression of the head tension or shear tension measurement data of at least two different metal sheet thicknesses t i and t t +1, which correspond to the upper and the lower limit of the metal sheet thickness interval ( t i t i +1), a shared function is determined for the maximum bearing load G(dp,t), which applies for a metal sheet thickness interval ( t i, t i +1) and has the form: G dp t = a ⋅ dp + b ⋅ t + c, wherein a, b and c are variables independent of dp or t, and wherein the following steps are carried out: - carrying out a plurality of shear tension or head tension tests for measuring the maximum tensile force F max of joined metal sheets with different metal sheet thicknesses in the metal sheet thickness interval ( t i, t i +1) and different weld spot diameters dp within a permissible weld spot diameter interval ( dp min, dp max) with the same material quality, - determining a linear regression function of the maximum tensile force F max, t i ( dp) for at least two metal sheet thicknesses t i and t i +1 of a material quality, - establishing a deviation interval with upper and lower limit for the at least two regression functions, where the following applies for the upper limit: F max, OG, t i dp = F max, t i dp + dQ and for the lower limit, the following applies: F max, UG, t i dp = F max, t i dp − dQ, - determining of a first linear trend function T t i ( dp) with the gradient m t i for a first metal sheet thickness, which runs through the points ( dp min / F max, UG,t i ( dp min)) and ( dp max / F max, OG,t i ( dp max)), - determining of a second linear trend function T t i +1 ( dp) with the gradient m t i +1 for a second metal sheet thickness, which runs through the points ( dp min / F max, OG,t i +1 ( dp min)) and ( dp max / F max, UG,t i +1 ( dp max)), - wherein the first metal sheet thickness t i is less than the second metal sheet thickness t i +1, and the gradient m t i is greater than the gradient m t i +1 - determining a further trend function G t i ( dp,t i) = m · dp + b t i for at least for two metal sheet thicknesses ( t i) and ( t i +1), with a) G t i dp max + dp min / 2, t i) = F max, t i dp max + dp min / 2 and b) G t i + 1 dp t = G t i dp t i + b t, wherein m = m i + m i + 1 / 2, b t = b ⋅ t − t i and b = F max, t i + 1 dp max + dp min / 2 − F max, t i dp max + dp min / 2 t i + 1 − t i, so that Gt i +1 ( dp,t) = m · dp + b t i + b · ( t - t i) indicates the maximum tensile force of a metal sheet connection dependent on the metal sheet thickness within the metal sheet thickness interval ( t i,t i +1) and dependent on the weld spot diameter dp · - carrying out a plurality of shear tension or head tension tests for measuring the maximum tensile force F max of joined metal sheets with different metal sheet thicknesses in the metal sheet thickness interval ( t i, t i +1) and different weld spot diameters dp within a permissible weld spot diameter interval ( dp min, dp max) with the same material quality, - determining a linear regression function of the maximum tensile force F max, t i ( dp) for at least two metal sheet thicknesses t i and t i +1 of a material quality, - establishing a deviation interval with upper and lower limit for the at least two regression functions, where the following applies for the upper limit: F max, OG, t i dp = F max, t i dp + dQ and for the lower limit, the following applies: F max, UG, t i dp = F max, t i dp − dQ, - determining of a first linear trend function T t i ( dp) with the gradient m t i for a first metal sheet thickness, which runs through the points ( dp min / F max, UG,t i ( dp min)) and ( dp max / F max, OG,t i ( dp max)), - determining of a second linear trend function T t i +1 ( dp) with the gradient m t i +1 for a second metal sheet thickness, which runs through the points ( dp min / F max, OG,t i +1 ( dp min)) and ( dp max / F max, UG,t i +1 ( dp max)), - wherein the first metal sheet thickness t i is less than the second metal sheet thickness t i +1, and the gradient m t i is greater than the gradient m t i +1 - determining a further trend function G t i ( dp,t i) = m · dp + b t i for at least for two metal sheet thicknesses ( t i) and ( t i +1), with a) G t i dp max + dp min / 2, t i) = F max, t i dp max + dp min / 2 and b) G t i + 1 dp t = G t i dp t i + b t, wherein m = m i + m i + 1 / 2, b t = b ⋅ t − t i and b = F max, t i + 1 dp max + dp min / 2 − F max, t i dp max + dp min / 2 t i + 1 − t i, a) G t i dp max + dp min / 2, t i) = F max, t i dp max + dp min / 2 and b) G t i + 1 dp t = G t i dp t i + b t, wherein m = m i + m i + 1 / 2, b t = b ⋅ t − t i and b = F max, t i + 1 dp max + dp min / 2 − F max, t i dp max + dp min / 2 t i + 1 − t i,