Ultra-Narrow Gap Welding Nozzle Cooling to Prevent Arc Bypassing
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Solution Overview
Problem
Existing welding technologies for ultra-narrow gaps face issues with arc bypassing, leading to unfused welded joints and voids due to the complexity of physical insulation methods, which require specialized materials and increase processing complexity.
Innovation Solution
A welding apparatus with a blowing mechanism, conductive nozzle, and industrial water-cooling unit that maintains low temperatures to inhibit ionization and arc bypassing, using a ceramic mouth structure to prevent arcing, and controlling welding current and voltage within specific ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical insulation method is used to control arc burning at the root of welding gap, then arc bypassing is eliminated, but device complexity increases due to specialized flux strip materials and conveying mechanisms
Solution Approach 1:
The patent extracts and removes the complex physical insulation components (flux strip materials and conveying mechanisms) from the welding system. Instead of using external insulation materials, the invention uses the welding wire itself as the electrode, eliminating the need for separate insulation components while maintaining arc control at the welding gap root.
Solution Approach 2:
The welding wire serves dual functions: as the electrode for arc generation and as its own insulation medium. The wire's own structure and positioning mechanism prevent arc bypassing without requiring external insulation materials, making the system self-sufficient and reducing overall complexity.
2Reliability
If physical insulation method is used to control arc burning, then arc bypassing is prevented, but manufacturing complexity increases due to specialized flux strip production and slag removal difficulties
Solution Approach 1:
The patent eliminates the need for specialized flux strip materials and their associated production processes. By using the welding wire itself as the electrode without external insulation materials, the invention removes the manufacturing steps for producing and handling specialized consumables.
Solution Approach 2:
The invention uses standard welding wire as the electrode without requiring expensive specialized flux strip materials. The system relies on the welding wire's own properties rather than additional consumable materials, reducing both material costs and manufacturing complexity.
3Productivity
If welding gap is reduced to ultra-narrow size, then welding work amount is reduced, but arc bypassing occurs causing unfused welded joints and voids
Solution Approach 1:
The patent changes the electrical parameters (current and voltage) to specific ranges that enable stable arc burning at the root of ultra-narrow welding gaps. By optimizing these parameters, the system achieves reliable welding quality in ultra-narrow gaps without arc bypassing, maintaining both productivity and reliability.
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 inhibits arc bypassing, reduces processing complexity, and eliminates the need for additional consumables, resulting in a more compact apparatus and efficient welding process.
Implementation Method 1
an industrial water-cooling unit, connected to the blowing mechanism, wherein a medium flow of the industrial water-cooling unit flows through the inside of the blowing mechanism, the industrial water-cooling unit is configured to reduce a temperature of the shielding gas outputted by the blowing mechanism and a temperature of the conductive nozzle
Implementation Method 2
a blowing mechanism, configured to output shielding gas
Implementation Method 3
the conductive nozzle is configured to provide a welding current and a welding voltage for the welding wire
Implementation Method 4
the arc needs to be controlled to be located inside the welding gap for fillet welding
Data Source
AI summary
The present invention provides a welding apparatus and a welding method for ultra-narrow welding gap, relating to the technical field of welding with an ultra-narrow welding gap. The welding apparatus for ultra-narrow welding gap comprises: a blowing mechanism, a conductive nozzle and an industrial water-cooling unit. The industrial water-cooling unit is connected to the blowing mechanism. A medium flow of the industrial water-cooling unit flows through the inside of the blowing mechanism. The industrial water-cooling unit is configured to reduce a temperature of the shielding gas outputted by the blowing mechanism and a temperature of the conductive nozzle.