1. A process for working a contour on at least one workpiece using a robot, the process comprising: positioning a workpiece relative to the robot; acquiring an actual position of the workpiece; acquiring a real course of a visible contour on the workpiece at predefined points using at least one sensor; and actuating the robot according to individual vectors so as to correct a robot motion during the working of the contour, wherein the contour is an invisible covered contour disposed close to the visible contour, and wherein the acquiring the real course of the visible contour includes acquiring and measuring visible points of the visible contour and calculating a position of the invisible covered contour based on the visible points, wherein the working includes one of welding and sealing a seam between the workpiece and a further workpiece, and wherein the workpiece and further workpiece include two automotive body parts.