Flexible Diaphragm Pressurization for Pore-Free Composite Welding
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Solution Overview
Problem
Existing methods for thermally joining thermoplastic fiber composite components often result in porosity due to air inclusion and require complex, costly clamping molds that are difficult to apply uniformly, especially in hard-to-reach areas.
Innovation Solution
A method and apparatus using a flexible pressurization arrangement that applies and maintains pressure on the components during and after welding, preventing air inclusion and eliminating the need for fixed clamping molds by using a flexible cover that can be electrically conductive, insulating, or permeable as needed for different welding techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If fixed clamping molds are used to apply pressure during welding, then pressure can be maintained, but the device complexity and cost increase significantly
Solution Approach 1:
The patent employs a flexible pressurization arrangement comprising a flexible membrane or diaphragm that can be inflated or deflated to apply and release pressure. This flexible shell approach replaces complex rigid clamping molds while maintaining effective pressure application during the welding process and subsequent cooling phase.
Solution Approach 2:
The pressurization arrangement utilizes pneumatic or hydraulic inflation mechanisms to generate and control the pressing force. By inflating a flexible chamber or membrane, the system achieves uniform pressure distribution across the welding zone without requiring mechanical linkages or complex mold structures.
2Reliability
If complex clamping molds are used to prevent air inclusion, then joint quality improves, but the ease of operation and adaptability decrease
Solution Approach 1:
The flexible membrane can conform to various component geometries and welding configurations, making the system highly adaptable. The membrane's flexibility allows it to accommodate different joint types and component shapes while maintaining effective pressure application, thereby improving ease of operation without compromising joint quality.
Solution Approach 2:
The pressurization system transitions from static rigid molds to a dynamic flexible membrane that can be inflated and deflated as needed. This dynamic approach allows rapid setup and teardown, and the membrane naturally adapts to different welding scenarios, enhancing both operational simplicity and versatility.
3Productivity
If pressure is released immediately after welding, then the process speed increases, but porosity forms due to air inclusion during solidification
Solution Approach 1:
The flexible pressurization arrangement maintains continuous pressure application from through the welding process and into the cooling phase. The membrane remains inflated throughout the solidification period, ensuring continuous suppression of air inclusion while allowing the welding head to move on to the next joint, thus maintaining productivity without sacrificing joint quality.
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 approach ensures a strong, pore-free joint by maintaining pressure until the matrix solidifies, simplifies the welding process, and reduces the complexity and cost of equipment, particularly benefiting applications like aircraft assembly.
Implementation Method 1
extensive pressurization of thermoplastic fiber composite components to be joined by the pressurization arrangement, with the result that the fiber composite components are pressed against one another
Implementation Method 2
welding the fiber composite components in the joining zone during pressurization
Implementation Method 3
maintaining the pressurization by the pressurization arrangement until the joining zone solidifies
Data Source
AI summary
A method for thermally joining thermoplastic fiber composite components, including jointly covering thermoplastic fiber composite components to be joined, at least in the region of a joining zone, with a pressurization arrangement, which is flexible, at least in some section or sections, and extensive pressurization of thermoplastic fiber composite components to be joined by the pressurization arrangement, with the result that the fiber composite components are pressed against one another, at least in the joining zone. The fiber composite components are welded in the joining zone during pressurization. The pressurization is maintained by the pressurization arrangement until the joining zone solidifies. A cover is also disclosed, in particular a mold or diaphragm, for a pressurization device for thermally joining thermoplastic fiber composite components, and an apparatus for thermally joining thermoplastic fiber composite components.