Bimetallic Coaxial Cable Outer Conductor Seam Design
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Solution Overview
Problem
The manufacture of bimetallic tubular conductors in coaxial cables is challenging due to the disparity in melting temperatures of the metals used, making welding difficult and increasing production costs.
Innovation Solution
A coaxial cable design featuring a tubular bimetallic outer conductor with angled longitudinal edge portions forming tabs, allowing for a less expensive material combination such as aluminum and copper, and a joint type like welding, adhesive, or soldering at the seam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heat-based welding is used to join bimetallic tubular conductors, then a continuous welded joint is achieved, but the manufacturing difficulty increases due to different melting temperatures of the metals
Solution Approach 1:
A flux-coated layer is applied to the bimetallic conductor before welding. This flux layer acts as an intermediary that facilitates the welding process by lowering the melting point at the interface, enabling the joining of metals with different melting temperatures (such as aluminum and copper) without requiring extreme heat that would damage the lower-melting-point metal.
Solution Approach 2:
The welding process parameters are modified by introducing chemical fluxes that change the thermal and chemical properties of the welding zone. The flux coating transforms the welding environment, allowing for lower temperature welding processes that are compatible with bimetallic constructions having disparate melting points.
2Ease of manufacture
If an inlaid bimetallic layer is used in the conductor, then welding becomes easier, but the manufacturing cost increases
Solution Approach 1:
The invention uses a composite structure consisting of a bimetallic conductor with a flux-coated layer. This composite approach combines the electrical conductivity benefits of dissimilar metals (such as aluminum core with copper cladding) with a flux coating that enables straightforward welding, avoiding the need for complex inlaid bimetallic constructions while achieving both ease of welding and cost-effectiveness.
Solution Approach 2:
The flux coating is applied as a relatively simple, cost-effective layer that can be easily applied during manufacturing. While the flux is consumed during the welding process, its low cost and simple application method make it economically superior to complex inlaid bimetallic structures, providing a disposable but highly effective solution to the welding problem.
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 design facilitates easier and cost-effective manufacturing of coaxial cables by using a less expensive bimetallic strip for the outer conductor, maintaining high electrical conductivity and signal carrying ability.
Implementation Method 1
The high frequency signals carried by the coaxial cable are concentrated in only a small portion, radially outermost, of the inner conductor, and a correspondingly small radially innermost portion of the outer conductor. This characteristic is attributed to the electromagnetic phenomenon called the skin effect.
Implementation Method 2
the manufacture of a bimetal tubular inner conductor usually involves some form of heat based welding, such as for example, conventional induction welding
Data Source
AI summary
A coaxial cable may include an inner conductor, an outer conductor and a dielectric material layer therebetween. The outer conductor may include a tubular bimetallic layer and may have a pair of opposing longitudinal edge portions at a longitudinal seam. The tubular bimetallic layer may include an inner metal layer and an outer metal layer bonded thereto and coextensive therewith. In addition, the opposing longitudinal edge portions may be angled outwardly to define a pair of adjacent outwardly extending tabs.