Slit Nozzle and Suction Port Layout for Laser Weld Shielding
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Solution Overview
Problem
Existing laser welding processes for lithium battery case assembly face challenges in providing uniform gas shielding and effective fume suction, leading to potential oxidation, porosity, and reduced weld quality.
Innovation Solution
A gas assistance device for laser welding, comprising an assistance gas unit with a slit-shaped nozzle and a fume suction unit with a slit-shaped port, where the fume suction unit is partially attached to the assistance gas unit, ensuring the fume suction port is located above the assistance gas nozzle, facilitating efficient gas shielding and fume removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a stationary welding head with integrated shielding gas nozzle is used, then the welding process is simple, but the gas shielding is not uniform and welding efficiency is low
Solution Approach 1:
The welding system is divided into separate components: a scanner welding head for high-speed welding and a separate gas assistance device for uniform gas shielding. This segmentation allows each component to be optimized independently, achieving both high welding efficiency and uniform gas distribution.
Solution Approach 2:
A separate gas assistance device is introduced as an intermediary component between the welding head and the workpiece. This mediator provides uniform gas shielding without interfering with the high-speed scanning welding process, resolving the conflict between welding efficiency and gas shielding quality.
2Object-generated harmful factors
If a separate suction pipe is used to remove fumes, then fume removal is possible, but suction gaps occur and shielding gas uniformity is disrupted
Solution Approach 1:
The fume suction function is merged with the gas assistance device by integrating a suction port into the device body. The suction port and gas nozzles work cooperatively within the same structure, ensuring that fume removal does not create suction gaps or disrupt shielding gas uniformity.
Solution Approach 2:
The suction port is nested within the gas assistance device structure, with the suction channel integrated into the device body. This nested design allows the suction function to be embedded within the gas shielding system, ensuring coordinated operation and maintaining shielding gas uniformity while effectively removing fumes.
3Object-generated harmful factors
If the fume suction port is not properly positioned relative to the gas nozzle, then fume suction may be effective, but shielding gas laminar flow is destroyed and weld quality decreases
Solution Approach 1:
The suction port is positioned at a specific location above the gas nozzle with precise spatial relationship. This localized positioning ensures that the suction action occurs at an optimal position that does not disrupt the laminar flow of shielding gas at the welding point, maintaining both fume removal effectiveness and weld quality.
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 device enhances the quality of weld joints by ensuring uniform gas shielding and effective fume suction, minimizing oxidation and porosity, and improving the overall efficiency of the laser welding process.
Implementation Method 1
In order to prevent oxidation and reduce porosity, it is necessary to provide partial gas shielding during the welding process
Implementation Method 2
fumes generated during the welding process need to be sucked out
Data Source
AI summary
A gas assistance device for laser welding includes an assistance gas unit configured to apply an assistance gas to a site to be welded, and a fume suction unit configured to suck fumes generated during laser welding. The assistance gas unit is provided with an assistance gas nozzle. The fume suction unit is provided with a fume suction port. The assistance gas nozzle includes a first slit-shaped opening. The fume suction port includes a second slit-shaped opening. The fume suction unit is at least partially attached to the assistance gas unit. In an operating state of the gas assistance device, the second slit-shaped opening is at least partially located above the first slit-shaped opening.