Patent ID: 7655880

Claim:
Method of monitoring resistance welding of a stack of metallic parts clamped between two electrodes of a clamp, comprising: applying to the electrodes, on the one hand, a clamping force, and on the other hand, an electric tension making it possible to pass a welding current through the stack of metallic parts to form each welding spot, measuring a force parameter representative of the clamping force before, during, and after, respectively, passage of the current, establishing threshold values of said clamping force, comparing the force parameter to at least two different threshold values to deduct therefrom an evolution of the force parameter and to control certain welding operations as a function of the evolution of said clamping force parameter, analyzing the clamping force measured during welding of each welding spot with respect to a model resulting from a preliminary learning phase, so as to produce an analysis result, and generating at least one of a correction signal and a control signal from a decision-making matrix as a function of the analysis result, so as to monitor and control the resistance welding of each welding spot based on said analysis result by using said decision-making matrix during welding of each welding spot.