Surface-Treated Friction Welding for High-Resistance Components
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Solution Overview
Problem
Friction welding is challenging for materials used in gas turbine engines due to their resistance to flow at high temperatures, requiring large amounts of energy to soften them sufficiently for effective joining.
Innovation Solution
A local surface treatment is applied to the connection surfaces of components, altering the microstructure through mechanical, thermal, or chemical processes to facilitate friction welding, potentially reducing the energy required for the welding process and improving weld properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction welding is used to join components made from materials resistant to flow at high temperatures, then the components can be joined without melting, but large amounts of energy are required to soften the materials sufficiently
Solution Approach 1:
A local surface treatment is applied to the connection surfaces of the components before friction welding to alter the microstructure and reduce the energy required for welding. This preliminary action modifies the material properties at the connection zone, making it softer and more susceptible to friction welding, thereby resolving the contradiction between achieving reliable joins and minimizing energy consumption
2Reliability
If traditional welding techniques are used to join components with wide difference in melting points, then the components can be joined, but the process is not suitable for dissimilar materials
Solution Approach 1:
The local surface treatment is applied specifically to the connection surfaces rather than the entire components, creating a localized zone with modified microstructure. This allows the connection surfaces to have different properties from the bulk material, enabling successful friction welding of dissimilar materials while maintaining the original material properties in the bulk, thus resolving the contradiction between joining reliability and adaptability to dissimilar 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 local surface treatment reduces the energy needed for friction welding, enabling successful joining of components with resistant materials using lower speeds, thus enhancing the efficiency and quality of the weld.
Implementation Method 1
a part of the component to which it is applied is contacted by a heated or cooled material to provide heating or cooling by conduction or convection
Implementation Method 2
heated by induction or heated by exposure to radiation, plasma or an electron beam
Implementation Method 3
heated by induction or heated by exposure to radiation, plasma or an electron beam
Implementation Method 4
heated by induction or heated by exposure to radiation, plasma or an electron beam
Implementation Method 5
Heat is generated as a result of friction between the components when one is moved relative to another while they are pressed together
Implementation Method 6
a part of the component to which it is applied is subjected to at least one of local peening, ultrasonic peening, burnishing and rubbing against another material
Data Source
AI summary
A method of joining a first component to a second component at respective connection surfaces, comprising, in order, applying a local surface treatment to the connection surface of at least one of the first and second components in order to locally alter the microstructure to a depth of between 60 μm and 10 mm below the connection surface; and joining the first component to the second component using a welding process.