Microporous Interlayer Pressure Joining for Dissimilar Metals
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Solution Overview
Problem
Existing electrically assisted pressure joining methods suffer from defects such as barreling in metal materials due to high compressive flow stress and deteriorated joining properties when heterogeneous materials are used, leading to damage and reduced bonding efficiency.
Innovation Solution
An electrically assisted pressure joining apparatus and method that incorporates an intermediate portion with micropores, manufactured through three-dimensional printing, is inserted between the metal members to apply pressure and current, minimizing damage and enhancing joining properties by creating a local high temperature and gradual mixing of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If direct contact joining of metal materials is performed by applying pressure and current, then joining is achieved, but defects such as barreling occur due to high compressive flow stress
Solution Approach 1:
An intermediate portion made of porous material is introduced between the first and second metal materials to act as a mediator during joining. This intermediate layer reduces the direct contact pressure and distributes the compressive flow stress, preventing barreling defects while enabling successful joining of the metal materials through diffusion bonding.
Solution Approach 2:
The intermediate portion is constructed from porous material with controlled porosity, which allows it to deform and accommodate the metal materials during pressing without transmitting excessive compressive stress. The porous structure absorbs and distributes the pressure, preventing barreling while maintaining joining effectiveness.
2Strength
If heterogeneous metal materials are joined by direct contact, then joining is achieved, but joining properties deteriorate due to component difference at joint portion
Solution Approach 1:
The intermediate portion serves as a transitional layer between heterogeneous metal materials, gradually transitioning from one metal composition to another. This gradient structure reduces the abrupt component difference at the joint interface, improving metallurgical compatibility and joining reliability for dissimilar metal combinations.
Solution Approach 2:
The intermediate portion features a gradual change in compositional parameters from one metal material to another, creating a gradient structure. This parameter transition reduces thermal and compositional mismatches at the joint interface, thereby improving joining properties for heterogeneous materials.
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 apparatus reduces damage to metal members by minimizing compressive flow stress and increases joining force through local temperature generation and component mixing, improving bonding efficiency and manufacturing efficiency by allowing direct placement of the intermediate portion.
Implementation Method 1
a high electrical resistance of the intermediate portion may generate a local high temperature portion
Implementation Method 2
atoms are diffused in joining surfaces of the two metal materials, resulting in joining of the two metal materials
Data Source
AI summary
An electrically assisted pressure joining apparatus and an electrically assisted pressure joining method join a first metal member and a second metal member together, and includes an electrode portion, an intermediate portion including a plurality of micropores and inserted between a first metal member and a second metal member, and a pressure portion connected to the electrode portion to receive a current from the electrode portion and transfer the current to the first metal member and the second metal member to apply a pressure to the first metal member such that the first metal member and the second metal member are joined together by the intermediate portion.