Friction Stir Welded Electrical Line Casing for Dissimilar Metal Joints
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Solution Overview
Problem
Existing methods for creating a large-area, firmly bonded connection between electrical lines and contact elements are limited by one-piece design configurations, restricting pre-assembly and weld quality, especially when joining different metal pairs like aluminum and copper.
Innovation Solution
A method involving friction stir welding, where a hollow cylindrical casing is affixed to an exposed conductor, allowing for two firmly bonded connections: one between the conductor and the casing, and another between the casing and the contact element, enabling durable connections under mechanical stress and allowing for pre-assembly and visual inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a one-piece design of receiving casing and contact element is used, then a large-area firmly bonded connection is achieved, but the design configuration of the contact element is restricted and pre-assembly is not possible
Solution Approach 1:
The receiving casing is divided into a modular structure with a separate contact element that can be pre-assembled and then integrated into the final product. This segmentation allows different design configurations of contact elements while maintaining the firmly bonded connection quality through standardized interfaces and welding processes.
2Adaptability or versatility
If different metal pairs like aluminum and copper are joined, then design flexibility is improved, but weld quality and connection reliability deteriorate
Solution Approach 1:
A transition piece or intermediate layer is introduced between dissimilar metals (e.g., aluminum conductor and copper contact element) to facilitate reliable welding. This intermediary component is compatible with both metals, allowing for high-quality welds on each side while joining different metal pairs, thus maintaining both design flexibility and weld quality.
3Productivity
If pre-assembly of line and receiving casing is enabled, then productivity is improved, but the complexity of the connection process increases
Solution Approach 1:
The contact element is pre-assembled with the receiving casing in a preliminary manufacturing step, allowing for quality control and inspection before final integration. This pre-assembly approach enables parallel production processes, improving overall productivity while the standardized modular design keeps the complexity manageable through repetition and standardization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides durable connections resistant to mechanical stress, facilitates pre-assembly and visual inspection, and allows for the joining of different metal pairs with high weld quality, enhancing design flexibility and logistical efficiency.
Implementation Method 1
For friction stir welding, a reaming tool, for example, a spindle, is inserted, at least in sections, into the casing from the front side facing the contact element being moved up, or is brought into contact at least with the free end of the conductor, that is, with a front side of the line, and is caused to rotate relative to the casing and relative to the conductor.
Data Source
AI summary
A method for producing an electrical line arrangement with an electrical conductor and an electrical contact element to be connected thereto includes preparation of the exposed conductor, affixing of a casing open on its two front sides up to the exposed conductor, and forming of a first firmly bonded connection between the exposed conductor and an interior perimeter section of the casing by friction stir welding, by introducing a reaming tool from one front side into the casing and rotating the tool relative to the casing and to the conductor. Additionally, the method includes forming of a second firmly bonded connection between the casing and the contact element.