Laser Welding Gas Enclosure Layout for Laminar Weld Protection
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Solution Overview
Problem
Laser welding systems face defects due to metal vapor and solid particles emitted during the process, which are not effectively removed by existing gas circulation methods, leading to turbulence and re-deposition of particles into the melt pool.
Innovation Solution
An apparatus with actuatable barriers and a controller ensures uniform, laminar gas flow by adjusting the cross-sectional areas of inlet and outlet openings, creating a pressure differential that enhances gas velocity and removes particles effectively without causing additional defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas circulation rate is increased to remove metal vapor and solid particles, then particle removal efficiency is improved, but turbulence increases causing defects in the weld
Solution Approach 1:
The patent changes the flow regime parameter from turbulent to laminar by adjusting gas velocity and flow characteristics. This resolves the contradiction by maintaining high particle removal efficiency through controlled laminar flow that avoids the turbulence-induced defects caused by high-speed chaotic flow.
Solution Approach 2:
The patent introduces a controllable gas flow system that can dynamically adjust flow characteristics. By controlling the transition to laminar flow, the system maintains optimal particle removal while preventing turbulence-related weld defects through real-time flow regime management.
2Object-affected harmful factors
If gas circulation is reduced to eliminate turbulence, then weld quality is improved, but particle removal efficiency decreases
Solution Approach 1:
The patent changes the flow regime parameter from turbulent to laminar, enabling effective particle removal at lower velocities. This resolves the contradiction by decoupling particle removal efficiency from high flow rates, allowing quiet laminar flow to achieve both weld quality and particle removal goals.
3Reliability
If gas flow velocity is increased to improve particle removal, then particle evacuation is enhanced, but turbulence is generated causing defects
Solution Approach 1:
The patent changes the flow regime from turbulent to laminar, allowing effective particle removal at controlled velocities without generating turbulence. This resolves the contradiction by enabling particle evacuation while maintaining manufacturing precision through smooth, non-turbulent flow characteristics.
4Manufacturing precision
If enclosure is used to contain the welding process, then process control is improved, but turbulence from gas circulation traps particles back in the melt pool
Solution Approach 1:
The patent changes the flow regime to laminar within the enclosed space, preventing turbulence from trapping particles. This resolves the contradiction by maintaining process control benefits of enclosure while ensuring continuous particle removal through non-turbulent flow patterns that don't recirculate contaminants.
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 achieves efficient removal of metal vapor and solid particles, ensuring defect-free welds by maintaining a stable and uniform gas flow over the melt pool during laser welding.
Implementation Method 1
the cross-sectional area of the first opening is larger than the cross-sectional area of the second opening so that a pressure at the inlet is greater than a pressure at the outlet
Implementation Method 2
the velocity of the gas exiting the enclosure at the outlet is higher than the velocity of the gas entering the enclosure at the inlet. This increases a static pressure differential and makes the flow of the gas more uniform and laminar
Data Source
AI summary
A laser welding system for welding a component and reducing defects in the weld by ensuring uniform, laminar gas flow over a process area of the system. The laser welding system comprises a laser for welding the component, a platform for supporting the component, an enclosure surrounding the platform, a first actuatable barrier, a second actuatable barrier, an actuator, and a controller. The enclosure includes a plurality of walls, one of the walls having an inlet and another wall having an outlet. The inlet and outlet each having an opening having a cross-sectional area for letting gas flow through. The first and second barriers are configured to modify the cross-sectional areas of the openings when actuated. The actuator is configured to actuate the barriers, and the controller is configured to direct the actuator to actuate the barriers so that the cross-sectional area of the first opening is larger than the cross-sectional area of the second opening so that a pressure at the inlet is greater than a pressure at the outlet.