Diffusion Alloy Insert Brazing for Superalloy Structural Repair
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Solution Overview
Problem
Hard-to-weld superalloy components in gas turbine machines face challenges in achieving sufficient mechanical strength due to difficulties in controlling the narrow brazing gap size, leading to inadequate repair methods that do not provide the necessary strength for operational conditions.
Innovation Solution
A method involving the fabrication of a diffusion alloy insert with a controlled narrow braze gap size, where a tapered slot is machined in the component, an insert with corresponding geometry is formed, a braze material layer is deposited and sintered, and the insert is positioned and brazed to join with the component, ensuring a strong structural repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If brazing is used to repair hard-to-weld superalloy components, then the components can be rejuvenated, but the mechanical strength is insufficient when the brazing gap size is not very narrow
Solution Approach 1:
A tapered slot is machined into the component before brazing, and a corresponding tapered insert is prepared in advance. This preliminary geometric configuration ensures that when the insert is placed in the slot, it automatically creates and maintains a narrow braze gap throughout the brazing process, enabling strong mechanical joints while repairing the component
Solution Approach 2:
A braze material layer is deposited on the insert surface as an intermediary substance. This braze material fills the narrow gap between the insert and the component, creating a strong metallurgical bond that provides the necessary mechanical strength for the repaired component to withstand operational loads
2Ease of manufacture
If conventional brazing is used for repair, then the process is simple, but the brazing gap size cannot be controlled to the desired narrow dimension
Solution Approach 1:
The repair process is segmented into distinct stages: machining a tapered slot with specific geometric dimensions, preparing a matching tapered insert, depositing braze material, and assembling. This segmentation allows each stage to be optimized independently, ensuring precise gap control while maintaining overall process simplicity
Solution Approach 2:
A tapered (asymmetric) geometry is used for both the slot and insert instead of parallel-sided configurations. The tapered shape naturally converges toward a narrow gap at the interface, providing automatic geometric control of the braze gap size without requiring complex adjustment mechanisms or high-precision assembly procedures
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 method effectively provides a component with a tensile strength greater than 500 MPa at room temperature, effectively addressing the limitations of existing repair techniques by ensuring a controlled narrow braze gap size for enhanced mechanical strength.
Implementation Method 1
The layer of the braze material is sintered on the outer surface of the insert to fabricate a diffusion layer
Implementation Method 2
the insert is positioned into the tapered slot and brazed to join the insert to the taper slot of the component
Data Source
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AI summary
A method (100) for treating a component (201) and a treated component (201) are provided. The method (100) includes the steps of machining (101) a tapered slot (204) in the component (201). The tapered slot (204) is measured to determine dimensions. An insert (301) is formed to have a corresponding geometry to the tapered slot (204) with a braze gap (303) between an outer surface of the insert (301) and an inner surface of the tapered slot (204). A layer of a braze material is deposited on the outer surface of the insert (301), where a thickness of the layer corresponds to the braze gap (303). The layer of the braze material on the outer surface of the insert (301) is sintered to fabricate a diffusion layer (302). The insert (301) is positioned into the tapered slot (204). The diffusion layer (302) is brazed to join the insert (301) to the taper slot. The treated component (201) includes a surface having a tapered slot (204), an insert (301), and a braze joint.