Laser Retouching Brazed Joints Aeronautical Components
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Solution Overview
Problem
Brazing defects in metal parts, particularly aeronautical components, lead to geometrical deformation, material property degradation, and new defects when repeated high-temperature oven cycles are used for retouching, resulting in scrapped assemblies and reduced production rates.
Innovation Solution
A low-power pulsed laser is used to retouch brazed joints, with peak power between 1500 and 3000 W, to locally limit the thermally affected zone and fill defects with compatible filler metal, reducing deformation and energy consumption while protecting against oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If repeated high-temperature oven cycles are used to retouch brazing defects, then the brazing defects can be repaired, but geometrical deformation and material property degradation occur
Solution Approach 1:
The patent applies local quality by using a laser beam to concentrate thermal energy precisely at the defect location rather than heating the entire assembly. This localized heating approach allows retouching of brazing defects while maintaining the geometrical precision of the overall assembly, directly resolving the contradiction between repair capability and deformation control
Solution Approach 2:
The patent changes the thermal parameters by using lower peak temperatures and shorter heating durations with the laser compared to traditional oven brazing. This parameter change enables defect repair without subjecting the entire assembly to high-temperature prolonged exposure that causes geometrical deformation and material degradation
2Ease of repair
If repeated high-temperature oven cycles are used to retouch brazing defects, then the brazing defects can be repaired, but the lifespan of aeronautical parts is reduced
Solution Approach 1:
By concentrating the thermal energy locally at the defect site using a laser beam, the patent minimizes the thermally affected zone. This prevents widespread thermal damage that would compromise the structural integrity and lifespan of aeronautical parts, while still achieving effective repair of the brazing defect
Solution Approach 2:
The patent uses controlled laser parameters including pulse duration, peak power, and duty cycle to limit the thermal impact on the base metal. This parameter optimization enables defect repair while preserving the metallurgical properties and extending the service life of critical aeronautical components
3Productivity
If the same oven is used for both brazing and retouching, then equipment utilization is maintained, but the production rate decreases due to batch processing requirements
Solution Approach 1:
The patent replaces the mechanical batch heating system (oven) with a localized energy delivery system (laser). This substitution enables individual part repair without requiring batch processing, thereby increasing production rate while maintaining ease of manufacture through direct defect treatment
Solution Approach 2:
The patent enables immediate retouching of defects as they are detected, rather than waiting to accumulate a batch of defective parts. This preliminary action approach eliminates production delays and maintains continuous workflow, directly addressing the productivity issue
4Ease of repair
If arc (TIG) welding is used to retouch defects, then high-power heating can melt and fill defects, but deformations occur that cannot be repaired
Solution Approach 1:
The patent uses a laser beam to deliver thermal energy with precise spatial control, concentrating heat only at the defect location. This localized approach provides sufficient melting and filling capability while avoiding the widespread thermal input from arc welding that causes irreparable deformations
Solution Approach 2:
The patent employs controlled laser parameters including lower peak power density and shorter interaction time compared to arc welding. This parameter optimization achieves effective defect filling while minimizing thermal distortion, preventing the irreparable deformations associated with high-power arc welding
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 repairs brazed joints with minimal deformation and energy use, maintaining part geometry and extending the lifespan of aeronautical components, while allowing for efficient production by avoiding the need for batch processing of defective parts.
Implementation Method 1
the brazed zones are retouched by means of a retouching laser, the peak power of the retouching laser being between 1500 and 3000 W, the retouching laser being used in pulsed mode
Implementation Method 2
the filler metal, in contact with the retouching laser beam, melts on the brazed zone in order to fill the brazing defects of the part
Data Source
AI summary
A method of retouching metal parts joined by brazing at high temperatures is disclosed. The brazed zones are retouched by a retouching laser. The peak power of the retouching laser is between 1500 and 3000 W. The retouching laser is used in pulsed mode.