Concave Convex Mesh Screen Assembly for Gas Shielded Arc Torch
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Solution Overview
Problem
Existing gas shielded electric arc torches face challenges in achieving uniform gas distribution and reducing turbulence around the weld puddle and arc, leading to inefficiencies in welding and cutting processes.
Innovation Solution
A gas diffusion screen assembly comprising a concave and convex mesh screen pair, integrated with an electrode collar, is designed to reside within a torch cup, promoting laminar gas flow and secure gas distribution, potentially fabricated from metals like stainless steel, aluminum, or brass with specific mesh sizes, and optionally featuring a transition O-ring for sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a conventional gas lens with layered mesh screens is used, then the shielding gas is distributed, but turbulence occurs around the weld puddle and arc
Solution Approach 1:
The patent applies curvature by forming the mesh screens as concave and convex surfaces that mirror each other. The concave screen has a radius of curvature between 0.5 to 2 inches, while the convex screen mirrors this curvature. This curved geometry transforms the gas flow pattern, converting turbulent flow into laminar flow while maintaining uniform gas distribution across the weld area.
Solution Approach 2:
The patent implements nesting by placing the concave and convex mesh screens in close proximity to each other, with the convex screen positioned inside the concave screen's curvature. This nested arrangement creates a confined space that guides gas flow smoothly between the screens, preventing turbulence while ensuring even gas distribution to the weld puddle and arc.
2Reliability
If mesh screens are added to distribute gas, then gas distribution improves, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the mesh screen assembly by integrating the gas distribution function with the electrode positioning function. The concave and convex screens are positioned to work together as a unified structure that both distributes shielding gas uniformly and maintains proper electrode alignment, eliminating the need for separate components and reducing overall device complexity.
Solution Approach 2:
The mesh screen assembly serves multiple functions simultaneously: it distributes shielding gas uniformly across the weld area, reduces turbulence through its curved geometry, and maintains electrode positioning stability. This multi-functionality allows a single component design to address multiple requirements without increasing overall system complexity.
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 enhances gas distribution, reduces turbulence, and improves the precision and quality of welding and cutting by maintaining a consistent and undisturbed laminar gas flow, leading to more efficient and precise processes.
Implementation Method 1
The gas lens functions to helps evenly distribute the shielding gas promoting a laminar flow around the tungsten and along the weld puddle and arc
Data Source
AI summary
A gas diffusion screen assembly is adapted for residing in a torch cup of a gas shielded electric arc torch. The gas diffusion screen assembly comprises a first concave mesh screen, a second convex mesh screen, and an electrode collar. The collar interconnects the first and second mesh screens, and defines an opening for receiving an electrode of the electric arc torch.