Laser Deposition Protrusion Technique for Edge Geometry Control
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Solution Overview
Problem
Direct laser deposition methods often fail to maintain the desired geometric shape and microstructure at thin edges and corners of components, as high power required for correct build out geometry negatively affects the microstructure.
Innovation Solution
A method involving surveying the workpiece to identify risk areas, forming low-heat melt pools, and injecting powdered metal to create protrusions that maintain the desired microstructure and geometry, allowing for controlled build layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If excessive power is used to generate a large melt pool and build profile to obtain correct build out geometry, then the desired geometric shape is achieved, but the microstructure of the laser deposition build is negatively affected
Solution Approach 1:
The deposition process is divided into multiple sequential build layers, where each layer is deposited and allowed to cool before the next layer is added. This segmentation allows for better control of heat input and microstructure development while achieving the desired build geometry through cumulative layering rather than single-pass high-power deposition.
Solution Approach 2:
The laser deposition process uses periodic heating and cooling cycles, where the laser beam is applied in controlled pulses or passes, allowing the material to melt and then solidify in a controlled manner. This periodic action enables precise control over both geometry and microstructure by adjusting the timing and intensity of each heating cycle.
2Quantity of substance
If individual build layers are deposited successively to form component structure, then material is added to the component, but consistency of deposition is difficult to achieve
Solution Approach 1:
The system incorporates monitoring and control mechanisms that track deposition parameters such as laser power, wire feed rate, and deposition rate. This feedback allows for real-time adjustments to maintain consistent deposition quality across multiple build layers, compensating for variations in material properties or process conditions.
Solution Approach 2:
The deposition process dynamically adjusts key parameters including laser power, scanning speed, and wire feed rate based on the specific requirements of each build layer and the observed deposition quality. These parameter changes enable consistent deposition by optimizing the process conditions for each layer while maintaining overall process stability.
3Quantity of substance
If high power laser deposition is used to build material on thin edges or thin airfoils, then material deposition occurs, but the desired geometric shape at edges and corners is not maintained
Solution Approach 1:
The laser deposition process applies different local conditions to different regions of the workpiece. For thin edges and corners, the system uses reduced laser power, adjusted scanning speeds, and modified wire feed rates compared to bulk areas. This local quality approach ensures that delicate geometries are preserved while still achieving adequate material deposition where needed.
Solution Approach 2:
The deposition process dynamically adapts parameters based on the local geometry being deposited. When the laser beam encounters edges or corners, the system automatically adjusts power, speed, and material feed rates in real-time to match the local geometric requirements, preventing distortion while maintaining deposition efficiency.
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 ensures the formation of build layers with the desired geometry and microstructure, even at thin edges and corners, by strategically forming protrusions to enhance material deposition and prevent deformation.
Implementation Method 1
a wire or powder of deposition material is presented below a laser beam such that the laser beam heats the deposition material
Implementation Method 2
The deposition material melts and, when re-solidified, becomes an integral part of a component structure
Implementation Method 3
melting, at low heat, the article at the first location using a light source to establish a first melt pool
Implementation Method 4
injecting powdered metal into the first melt pool, and solidifying the first melt pool to form the first protrusion
Data Source
AI summary
A method of applying a laser metal formed build layer on a surface of an article. The surface of the article is melted locally using a light source to form a melt pool. Powdered metal is injected into the melt pool. The melt pool is solidified to form the build layer having a desired microstructure and geometry on the surface of the article.