Verfahren zum Herstellen eines Fahrdrahtes für die Stromversorgung elektrisch angetriebener Fahrzeuge

摘要

A procedure for making a trolley wire to supply electric vehicles uses a steel wire surrounded by copper as well as a copper wire joined to it. A steel wire preheated to 900-950 deg C is completely sheathed by two part-strips also preheated to the same temperature within a reduced gas atmosphere. The first part strip is copper and the second is either copper or a high tensile copper alloy. The part-strips are joined metallically with the steel wire surface by rolling. During the process, the cross- section of the compound element is reduced by at least 20%. A copper wire preheated to the same temperature is joined by rolling to the element in the region of the first part strip.