Dissimilar Metal Transition Joint With Additive Collar Reinforcement
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Solution Overview
Problem
Current methods for manufacturing transition joints between dissimilar metals, such as aluminum and steel, are prone to failures that can lead to equipment damage, operator injury, and increased manufacturing costs, especially when dealing with larger parts and heavier wall thicknesses, due to overheating and limitations in weld joint geometry.
Innovation Solution
A dissimilar metal article is created using friction stir welding with an additive flow material bonded to the transition joint and outer surfaces of the components, which intermixes with the metals to form a strengthened collar, enhancing the joint's reliability and reducing the risk of overheating and geometry limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If friction stir welding is used to join larger parts with heavier wall thickness, then the joint strength is improved, but overheating of the joint components occurs during welding
Solution Approach 1:
A collar made from additive flow material serves as an intermediary component that is bonded to the joint components and the transition joint. This collar absorbs and distributes the thermal energy during welding, preventing overheating of the base joint components while maintaining joint strength. The collar acts as a thermal buffer that protects the critical welding interface from excessive temperatures.
2Reliability
If multiple interlayers with multiple explosion welding shots are used to manufacture transition joints, then the bond between dissimilar metals is improved, but manufacturing costs increase
Solution Approach 1:
The invention extracts and eliminates the need for multiple interlayers and multiple explosion welding shots from the manufacturing process. Instead of using complex multi-layer clad plates requiring sequential welding operations, the collar-based reinforcement approach achieves equivalent or superior bond reliability with a single welding operation, dramatically reducing manufacturing complexity and cost.
3Reliability
If transition joints are machined from explosion welded clad plates, then the bond between dissimilar metals is achieved, but weld joint geometry limitations and proximity to welded interfaces are worsened
Solution Approach 1:
The invention segments the joint reinforcement function from the base joint geometry. Instead of relying on complex multi-layer clad plate constructions with specific geometric constraints, the collar is applied as a separate reinforcing element that can accommodate various joint geometries without requiring precise control of the base metal dimensions or multiple welding interfaces.
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 provides a more reliable and stronger transition joint that reduces the risk of equipment damage and personal injury, while also lowering manufacturing costs by eliminating the need for multiple interlayers and plate qualification testing.
Implementation Method 1
friction stir welding
Implementation Method 2
additive flow material is distributed to the joint and circumferentially around an outer diameter of each of the first metallic component and second metallic component to intermix at the joint with the softened metals
Data Source
AI summary
A dissimilar metal article may include a first metallic component including a first metal material, a second metallic component comprising a second metal material, and a transition joint provided between and bonding a first metallic component first end surface to a second metallic component first end surface. An additive flow material may be further provided to the dissimilar metal article to strengthen the joint between the first metallic component and the second metallic component.