Induction Welding of Conductivity-Mismatched Thermoplastic Bodies
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Solution Overview
Problem
Existing welding methods for thermoplastic materials lack efficiency and effectiveness in achieving strong, deformation-resistant welds, particularly when different materials with varying electrical conductivities are involved.
Innovation Solution
The method involves induction welding a first thermoplastic body with a first fiber-reinforcement of a specific electrical conductivity and a second thermoplastic body with a second fiber-reinforcement of a higher electrical conductivity, using an induction welding coil to create a differential heating effect that enhances weld integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional welding methods are used for thermoplastic materials, then the welding process can be completed, but the weld strength is insufficient and heat-related deformation occurs
Solution Approach 1:
The patent applies local quality by creating different electrical conductivities in different regions of the thermoplastic bodies. The second thermoplastic body is designed with higher electrical conductivity through specific fiber reinforcement placement, causing localized differential heating during induction welding. This concentrates heat at the weld interface while protecting surrounding areas from excessive heat, thereby achieving strong welds with minimal deformation.
Solution Approach 2:
The patent utilizes parameter changes by modifying the electrical conductivity parameter of the thermoplastic bodies through selective fiber reinforcement. By changing the electrical conductivity distribution, the heating characteristics during induction welding are fundamentally altered, enabling precise control over heat distribution to achieve optimal welding results.
2Reliability
If thermoplastic bodies with different electrical conductivities are welded, then differential heating effect is achieved, but the complexity of material preparation increases
Solution Approach 1:
The patent employs composite materials by combining thermoplastic matrices with fiber reinforcements of different electrical conductivities. The first thermoplastic body uses standard fiber reinforcement while the second body incorporates enhanced fiber reinforcement or conductive additives, creating composite structures with tailored electrical properties that enable reliable induction welding.
3Ease of manufacture
If uniform heating is applied during induction welding, then the heating process is simple, but weld quality deteriorates due to excessive heat in certain areas
Solution Approach 1:
The patent implements local quality by designing the second thermoplastic body with higher electrical conductivity through specific fiber reinforcement placement. This creates intentional non-uniform heating during induction welding, concentrating thermal energy at the weld interface where it is most needed while protecting adjacent areas from overheating, thereby achieving superior weld 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 results in robust welds that minimize heat-related deformation, ensuring strong and reliable connections between thermoplastic components with different electrical conductivities.
Implementation Method 1
induction welding a first thermoplastic body with a first fiber-reinforcement... and a second thermoplastic body with a second fiber-reinforcement... using an induction welding coil
Implementation Method 2
The second fiber-reinforcement has a second electrical conductivity that is greater than the first electrical conductivity
Implementation Method 3
create a differential heating effect that enhances weld integrity
Data Source
AI summary
A method is provided during which a first thermoplastic body is provided. The first thermoplastic body includes first fiber-reinforcement with a first electrical conductivity. A second thermoplastic body is provided. The second thermoplastic body includes second fiber-reinforcement with a second electrical conductivity that is greater than the first electrical conductivity. The second thermoplastic body is arranged with the first thermoplastic body. The second thermoplastic body is induction welded to the first thermoplastic body using an induction welding coil. The second thermoplastic body is arranged between the first thermoplastic body and the induction welding coil.