Verfahren zur Prüfung des Abstandes beschichteter Bleche für deren Schweissbearbeitung

In coated sheets the coating material often has a significantly lower melting point than the material of the sheet. Accordingly, when welding together this type of sheets, there may occur explosion-like evaporation of coating material, which significantly compromises the quality of the joint. For improving the joining quality it has already been proposed to provide a narrow gap between the sheets, through which the vaporized coating material can escape. The present invention provides a process and a device for simple and reliable checking the spacing of the sheets. This is done by a process and a device in which on at least one side of a first sheet topographical changes are produced projecting from the surface, the first sheet is positioned and clamped relative to a second sheet with the topographical changes projecting from the surface defining a minimal spacing between the two sheets through which spacing, during welding, vaporized products can escape, and wherein it is checked whether the two sheets are in contact with each other via the topographical changes projecting from the surface.