Laser Welding Nozzle Layout to Block Metal Vapor on the Window
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Solution Overview
Problem
Existing laser welding devices face challenges in effectively preventing metal vapor from adhering to the laser transmission window, despite the use of shield gases, as the vapor can still reach and adhere due to insufficient shielding properties.
Innovation Solution
A laser welding device is designed with a gas injection nozzle that injects inert gas in the direction of the laser beam's irradiation and optical axis, forming a gas shield to weaken and push back the metal vapor, preventing it from reaching the transmission window, and includes features like an inclined injection unit and circumferential slit shape to enhance shielding efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shield gas is introduced into the shield gas pipe to prevent metal vapor from reaching the transmission window, then the shielding property is improved, but the metal vapor force is insufficiently weakened and adhesion still occurs
Solution Approach 1:
The gas injection nozzle acts as an intermediary device between the shield gas pipe and the workpiece. It introduces inert gas directly into the optical path hole where metal vapor is generated, creating a localized gas barrier that more effectively intercepts and weakens metal vapor before it reaches the transmission window, thereby enhancing the shielding property.
Solution Approach 2:
The invention utilizes pneumatic principles by injecting inert gas through the gas injection nozzle into the optical path hole. The gas flow creates a pneumatic barrier that pushes back against the metal vapor, weakening its force and preventing adhesion to the transmission window through gas dynamic pressure.
2Reliability
If inert gas is injected into the optical path hole toward the irradiation direction side and optical axis side, then metal vapor force is weakened and shielding is enhanced, but the device structure becomes more complex
Solution Approach 1:
The gas injection nozzle combines multiple functions into a single integrated component: it serves as both a shield gas introduction device and a structural element with an optical path hole for laser beam transmission. The nozzle body integrates the gas injection holes and the optical path, merging the shielding function with the optical transmission path to reduce overall device complexity.
Solution Approach 2:
The gas injection nozzle performs multiple functions simultaneously: it introduces shield gas into the optical path hole, maintains structural support for the optical path, and directs gas flow to weaken metal vapor. This multi-functionality reduces the need for separate components, thereby managing device complexity while enhancing shielding property.
3Reliability
If gas injection nozzle with optical path hole is used to inject inert gas, then metal vapor shielding is improved without interfering with laser beam irradiation, but the nozzle structure requires precise alignment
Solution Approach 1:
The optical path hole in the gas injection nozzle is designed with specific local qualities: its diameter is sized to allow laser beam transmission while being sufficient for gas flow, and its position is precisely located on the nozzle centerline. This localized precision ensures that the hole provides both optical transmission and effective gas injection without requiring extreme manufacturing precision throughout the entire nozzle structure.
Solution Approach 2:
The gas injection holes are asymmetrically arranged around the optical path hole rather than being symmetrically distributed. This asymmetric arrangement optimizes gas flow patterns to effectively intercept metal vapor while maintaining clear optical path alignment, reducing the stringency of alignment requirements compared to symmetric configurations.
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 solution effectively prevents metal vapor from adhering to the laser transmission window during welding, maintaining the integrity of the welding process without interfering with the laser beam's irradiation and stabilizing the gas shield's performance.
Implementation Method 1
an injection unit that injects inert gas for shielding metal vapor, which is ejected from the workpiece to the laser transmission window side when the workpiece is welded by the laser beam, into the optical path hole
Implementation Method 2
a laser beam irradiation unit that irradiates the workpiece with a laser beam to weld the workpiece
Implementation Method 3
the workpiece is melted by the laser beam with which the workpiece is irradiated
Implementation Method 4
by injecting an inert gas to metal vapor ejected from a workpiece toward an irradiation direction side and the optical axis side of a laser beam, it is possible to further weaken a force of the metal vapor ejected from the workpiece
Data Source
AI summary
The laser welding device includes a laser transmission window and a gas injection nozzle. The gas injection nozzle includes an optical path hole and an injection unit that injects an inert gas for shielding metal vapor into the optical path hole toward an irradiation direction side and an optical axis side of a laser beam.