Now it is official: The excellent electrical conductivity of TOX®-Round Joint and TOX®-SKB Joints for joining sheet metal from the same or different materials with the same or different thickness was proven in a comprehensive study of the Technical University of Dresden! The intensive study on the topic of “Electrical property profile of formed joints” was performed by the institute for surface and production engineering together with the institute for electrical energy supply and high voltage technology of the TU Dresden. Leading representatives of the automotive industry and its suppliers as well as several manufacturers of joining and fastening technology products participated in the preliminary sessions of the PbA (project advisory board) performed by the “Joining” workgroup. Here, amongst others, a requirements profile and an experimental design were developed, whereby the experimental design was then fully used during implementation in practice. A basic distinction was made between the mechanical joining (e.g. pressure joining/clinching), the component connection (e.g. placing bolts, rivet nuts) and the mechanical joining with component connection (e.g. punched nuts). The trial was defined for “long-term stable mechanical joining of components with partially available functional integration through fastening of attachment parts (functional elements)”. With a view to the state of the art, the mechanical strength (shear, tensile and turning strength) was taken as much into account for this as the so far almost non-existing demand on the electrical properties of such joints. The practical background here is that the search for energy- and material-saving fastening and joining solutions is now being extended to electrical components and assemblies. In particular to get away from the additional, material- and energy-intensive procedures like spot welding, soldering or laser soldering and to give room to new, more economical manufacturing processes.
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