Coaxial Powder Nozzle Assembly for Uniform Laser Cladding
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Solution Overview
Problem
Existing laser cladding and consolidation systems face issues such as varying layer thickness and waviness, nozzle clogging, and metallurgical defects, limiting the fabrication of large components and requiring frequent nozzle replacements.
Innovation Solution
A nozzle assembly with side-feeding powder tubes made of high thermal conductivity materials, optimized for angle and length-to-diameter ratio, coupled with a control system to facilitate precise powdered material delivery and shielding gas, ensuring uniform layer deposition and reduced nozzle clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If off-axis nozzles are used in laser cladding systems, then powder delivery is simplified, but nozzle clogging occurs frequently
Solution Approach 1:
The patent inverts the conventional off-axis nozzle configuration by implementing a coaxial nozzle arrangement where the powder delivery axis aligns with the laser beam axis. This inversion eliminates the clogging issues associated with off-axis designs while maintaining simplified powder delivery through the central channel configuration.
Solution Approach 2:
The patent introduces an intermediary gas flow system that carries powdered material through a central channel to the deposition zone. This intermediary mechanism enables reliable powder delivery without direct contact between the powder stream and nozzle walls, preventing clogging while maintaining operational simplicity.
2Ease of manufacture
If conventional nozzle geometries are used, then powder delivery is straightforward, but excessive powder stream velocity causes metallurgical defects
Solution Approach 1:
The patent modifies the nozzle geometry parameters, specifically the channel length-to-diameter ratio and internal surface characteristics, to control powder stream velocity. By optimizing these parameters, the system achieves reduced powder velocity that prevents metallurgical defects while maintaining straightforward nozzle manufacturing.
3Reliability
If frequent nozzle replacements are performed, then clogging issues are resolved, but process runtime is interrupted and productivity decreases
Solution Approach 1:
The patent implements a coaxial nozzle design with optimized geometry that eliminates the need for frequent nozzle replacements. The continuous powder delivery system maintains reliable operation throughout extended build processes, ensuring uninterrupted productivity while resolving clogging issues through the inherent design.
4Productivity
If high powder stream velocity is achieved, then material delivery efficiency is improved, but metallurgical defects occur in cladding layers
Solution Approach 1:
The patent optimizes the nozzle internal geometry parameters, including channel length, diameter, and surface characteristics, to control powder stream velocity. These parameter changes reduce excessive velocity while maintaining efficient material delivery, preventing metallurgical defects in the cladding layers.
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
Enhances the operational life of the nozzle assembly, allowing for longer runtime and reduced manufacturing costs by minimizing clogging and metallurgical defects, enabling the fabrication of complex geometries with improved layer uniformity.
Implementation Method 1
side-feeding powder tubes made of high thermal conductivity materials
Implementation Method 2
a laser beam generates a melt pool on a substrate, such as the component, into which powdered material is deposited
Data Source
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AI summary
Described is a nozzle assembly (102) that includes a body component (130) defining a center axis (A). The nozzle assembly (102) also includes an energy beam channel (150) concentric with the center axis (A). The energy beam channel (150) has an inlet portion (152) and an outlet portion (154) configured to pass an energy beam (106) therethrough. At least one side feeding powder tube (132) extends through the body component (130) at an angle (α) with respect to the center axis (A). The side feeding powder tube (132) discharges a powdered material (110) into a focus point (B) of the energy beam (106). The angle (α) is configured to generate a powder concentration spot diameter that is about twice a beam focus point (B) diameter of the energy beam (106) focus point (B).