Conductive Heat Transfer Strip for Uniform Composite Induction Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing induction welding technologies for thermoplastic composites face challenges with non-uniform heating due to edge effects, leading to poor weld quality, particularly in anisotropic materials.
Innovation Solution
An induction welding assembly comprising an induction welding coil, heat shield, conductive heat generation and transfer member, and actuator, which aligns the conductive member with the coil and shield to uniformly heat the weld interface by conductive heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing induction welding technology is used to weld thermoplastic composites, then the welding process can be completed, but non-uniform heating occurs due to edge effects causing poor weld quality
Solution Approach 1:
A conductive heat transfer member is introduced as an intermediary between the induction coil and the workpiece. This member has high electrical conductivity (at least 500,000 S/m) and high thermal conductivity (at least 10 W/mK) to uniformly distribute both electromagnetic energy and heat across the weld interface, eliminating edge effects and achieving uniform heating throughout the weld zone.
Solution Approach 2:
The conductive heat transfer member is positioned specifically at the weld interface where uniform heating is most critical. The member's properties are optimized for the local heating requirements, with higher electrical and thermal conductivity concentrated at the interface between workpieces to ensure uniform temperature distribution precisely where needed for weld quality.
2Reliability
If induction welding is performed on anisotropic composite materials, then welding can be achieved, but edge effects become more severe due to the anisotropic and inhomogeneous nature of the composite
Solution Approach 1:
The conductive heat transfer member serves as a mediator that decouples the heating process from the anisotropic properties of the composite workpiece. By introducing this homogeneous, highly conductive intermediate layer, the electromagnetic energy is uniformly distributed before entering the anisotropic material, preventing edge effects caused by the material's directional properties.
Solution Approach 2:
The invention changes the electrical and thermal conductivity parameters at the weld interface by introducing the conductive heat transfer member. This member provides consistently high electrical conductivity (≥500,000 S/m) and thermal conductivity (≥10 W/mK) regardless of the workpiece's anisotropic properties, thereby standardizing the heating parameters and eliminating edge effects associated with composite material heterogeneity.
3Manufacturing precision
If complex welding parameters are used to achieve good weld quality, then uniform heating can be obtained, but the welding process becomes more complex
Solution Approach 1:
The conductive heat transfer member acts as a passive intermediary that inherently provides uniform heat distribution through its high thermal conductivity, eliminating the need for complex active control parameters. The uniformity of heating is achieved through the material properties of the intermediate layer itself rather than through complex welding parameter adjustments.
Solution Approach 2:
The invention simplifies the welding process by changing the fundamental parameters of heat and electrical conductivity at the interface through the conductive member. This eliminates the need for complex parameter tuning, as the high electrical conductivity (≥500,000 S/m) and high thermal conductivity (≥10 W/mK) of the intermediate layer automatically ensure uniform heating with simpler process control.
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
The solution ensures uniform heating of thermoplastic composite welds by using a conductive heat transfer member to distribute heat evenly, improving weld quality and reducing the need for complex parameters.
Implementation Method 1
An electromagnetic field is generated using the induction coil, and the first workpiece and the second workpiece are welded together (e.g., via heat that is generated within the conductive heat generation and transfer member (via induction heating of the transfer member)
Implementation Method 2
heat that is generated within the conductive heat generation and transfer member (via induction heating of the transfer member)
Implementation Method 3
heat that is generated within the conductive heat generation and transfer member
Implementation Method 4
Conductive heat transfer through the thickness of the conductive heat transfer member may heat a first workpiece and weld the first workpiece to a second workpiece
Data Source
AI summary
An induction welding assembly and inductive welding method is disclosed. A tooling block includes a workpiece zone, a conductive heat generation and transfer member, and a heat shield, with the conductive heat generation and transfer member being disposed between the workpiece zone and the heat shield. A first workpiece and a second workpiece may be disposed within the workpiece zone such that the first workpiece is disposed between the conductive heat generation and transfer member and the second workpiece. The heat shield, conductive heat generation and transfer member, first workpiece, and second workpiece may be pressed together. An induction coil may be positioned in spaced relation to the heat shield and may be operated to heat the conductive heat generation and transfer member. Heat is conductively transferred by the conductive heat transfer member to the first workpiece to weld the first workpiece and the second workpiece together.