Method for electrically conductively connecting a contact piece to an electrical conductor, and corresponding arrangement

Abstract

A method is provided for electrically conductively connecting a contact part on the basis of copper to an electrical conductor composed of a plurality of individual wires containing aluminum. A cup-shaped contact part which has a bottom and a cylindrical sleeve, which is integrally connected to the bottom and protrudes from the bottom, is pushed with tight contact of the sleeve against the conductor to such an extent until the end face of the conductor rests against the bottom of the contact part. Consequently, at least one rotating tool (6) is applied with sustained pressure, until due to increased temperature of the conductor, the conductor is softened to such an extent that it integrally connects with the contact part. The wall of the contact part is not broken through by the tool. Finally, the tool is removed from the contact part.

Description

RELATED APPLICATION[0001]This application claims the benefit of priority from European Patent Application Nos. 12 306 457.8, filed on Nov. 23, 2012 and 13 182 307.2, filed on Aug. 30, 2013, the entirety of which are incorporated by reference.BACKGROUND[0002]1. Field of the Invention[0003]The invention relates to a method for electrically conductively connecting a contact piece on the basis of copper to an electrical conductor consisting of a plurality of individual wires of aluminum, as well as a corresponding arrangement.[0004]2. Description of Prior Art[0005]The contact piece on the basis of copper consists either of copper or of a copper alloy. Additionally, it may have on its outer surface a layer of, for example, tin, zinc or nickel which are for example, precipitated galvanically. In the following, the contact piece is referred to only as “contact piece” without material identification. The individual wires of the conductor are either of aluminum or an aluminum alloy. In the f...

AI Technical Summary

Benefits of technology

The invention is a method for connecting a contact part to an aluminum conductor consisting of individual aluminum wires. The method involves using a copper contact part that is electrically conductively connected to the aluminum conductor through a process involving heat and pressure. The contact part is pushed onto the conductor until it rests on the floor of the contact part. The method does not require the use of additional materials such as tin or fastening elements and can be carried out with a rotating tool. The tool is pressed against the contact part and the conductor, creating a secure electrically conductive connection. The method can be used with a holding device or an adjustable tool. The technical effects of the invention include achieving a reliable electrically conductive connection between the contact part and the aluminum conductor, without compromising the integrity of the contact part or the insulation surrounding the conductor.

Problems solved by technology

However, problems occur when placing contact parts on the conductors because aluminum conductors are surrounded by an electrically very poorly conducting oxide layer.

This deficiency becomes apparent in the case of conductors which are composed of a plurality of individual wires, also called stranded conductors, each of which is surrounded by an oxide layer which cannot be avoided without special treatment.

This results in a cover like tinning or welding at the end of the stranded conductor.

Images