Guide Vane Mounting Hook Repair With Low-Distortion Material Deposition
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Solution Overview
Problem
In turbomachines, especially gas turbines, guide vane mounting hooks wear out over time, exceeding specified tolerances and requiring effective repair methods to maintain operational efficiency and prevent power loss and stability issues.
Innovation Solution
A method involving the removal of worn material over the entire circumference of the receiving hook in a turbomachine housing, followed by application of second material using laser powder deposition welding or plasma welding processes, applied in multiple layers with localized heat to minimize distortion, and subsequent heat treatment to enhance wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If conventional welding processes are used to repair the receiving hook, then the repair can be completed, but the heat input causes significant distortion of the mounting hook and housing
Solution Approach 1:
The patent replaces conventional thermal welding processes with laser powder deposition welding, which uses a highly concentrated laser beam to melt and deposit material with minimal heat input. This substitution of the heating mechanism resolves the contradiction by enabling repair while minimizing thermal distortion of the mounting hook and housing.
Solution Approach 2:
The patent applies material only to the specific worn areas of the receiving hook rather than the entire component. The laser powder deposition process deposits material locally where needed, concentrating the repair action only in the affected regions and minimizing heat input and distortion to the surrounding areas.
2Reliability
If material is removed from worn areas of the receiving hook, then the worn surfaces are eliminated, but the receiving hook dimensions change and require subsequent material application
Solution Approach 1:
The patent removes worn material from the receiving hook surface through machining or abrasion, then recovers the removed dimensions by depositing new material using laser powder deposition welding. This cycle of removing degraded material and recovering the original dimensions restores the component to its initial state, maintaining both reliability and dimensional accuracy.
Solution Approach 2:
The patent applies a second material (wear-resistant alloy powder) onto the prepared surface of the receiving hook. This creates a composite structure where the base material provides structural integrity and the deposited wear-resistant material provides enhanced surface properties, simultaneously achieving wear resistance and dimensional accuracy.
3Duration of action of stationary object
If the receiving hook is repaired multiple times, then the service life is extended, but the accumulated heat input and material layers increase complexity
Solution Approach 1:
The patent performs preliminary preparation of the surface (cleaning, roughening, or machining) before each material deposition step. This preliminary action ensures proper adhesion of the new material layer to the existing surface, enabling multiple repair cycles without compromising the quality of subsequent layers and managing process complexity systematically.
Solution Approach 2:
The patent applies material in multiple thin layers rather than a single thick layer. Each layer is deposited separately using laser powder deposition welding, allowing for better control of the deposition process, reduced residual stresses, and improved adhesion. This segmented approach facilitates multiple repair cycles while managing process complexity.
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 method effectively repairs guide vane mounting hooks, maintaining or exceeding new part manufacturing accuracy and strength, reducing wear, and minimizing distortion, thereby extending service life and adhering to scheduled maintenance intervals.
Implementation Method 1
The application is carried out using localized heat via a laser powder deposition welding process
Implementation Method 2
a plasma welding process
Implementation Method 3
Ablation can also be carried out by means of electrical discharge machining (EDM), laser ablation, or other methods
Implementation Method 4
laser powder deposition welding process
Data Source
Figure 1
Figure 2
Figure 3a~3d
AI summary
The present invention relates to a method for repairing a receiving hook (200) for guide vanes, wherein the receiving hook (200) is arranged in a housing (100) of a turbomachine, comprising the steps of removing first material in a region (17) of the receiving hook (200), wherein the region (17) extends over the circumference of the housing (100), and subsequently the further step of applying second material in or onto the region (17), wherein the applied region (17) extends over the circumference of the housing (100), and wherein the application is carried out using local heat.