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Welded nuts are used in car body construction, which are automatically welded to sheet metal parts to screw assemblies together. They are placed in a welding fixture on a mandrel before a robot positions and centers the body part. Before the nut is then welded to the sheet metal part with welding tongs, a laser distance sensor triangulation must check whether the nut is placed on the mandrel. Due to the large working range with high precision, the sensor can be mounted further away from the process to protect the sensor.