Method for monitoring a resistance welding process and device therefor
AssigneePeugeot Citroen Automobiles SA
InventorsPatrice Auger, Jacky Soigneux
Life of this patent
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Abstract
A method for monitoring a resistance welding process carried out on a stack of metal workpieces (1) clamped between two electrodes (2a, 2b) of a clamp (3), and a device therefor. According to the method, the electrodes (2a, 2b) are subjected to a clamping force (F) and a voltage (V(t)) enabling a current (I(t)) to flow through the stack of metal workpieces (1). The monitoring method further includes at least one step of analysing the clamping force (F) by comparison with a model from a prior learning process. The result of the analysis of each step is taken into account by a decision-making matrix to generate a correction and/or control signal intended for the welding process.
Claims12
Method for monitoring a resistance welding method 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 current through the stack of metallic parts, the welding method comprising at least a step of measuring a force parameter representative of the clamping force before, during, and after, respectively, passage of the current, and the monitoring method comprising at least one step of establishing threshold values of said clamping force and at least one step of 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,
- wherein the monitoring method comprises further at least one step of analyzing the clamping force with respect to a model resulting from a preliminary learning phase, the analysis result of each step being taken into account by a decision-making matrix making it possible to generate a correction and/or control signal intended for the welding method.
Dependencies are inferred from the claim text.