Tungsten Arc Wire Preheating for Oxide-Free High-Rate Welding
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Solution Overview
Problem
Conventional welding systems face inefficiencies due to low deposition rates and excess energy transfer, leading to distortion, metallurgical property alteration, and increased oxidation when welding wire is not preheated, and existing preheating methods like Joule heating suffer from high energy losses and undesirable arcing.
Innovation Solution
The use of electric arcs generated by tungsten electrodes to preheat welding wire, reducing current requirements and maintaining efficiency across various material types, while also removing surface oxides and contaminants, thereby enhancing deposition rates and preventing weld defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If welding wire is not preheated, then the welding system operates with simple equipment, but deposition rates are low and excess energy transfer causes distortion and metallurgical property alteration
Solution Approach 1:
The patent applies preliminary action by preheating the welding wire before it reaches the weld zone using an electric arc generated by a tungsten electrode. This preheating action prepares the wire in advance, reducing the thermal gradient and energy transfer to the workpiece during welding, thereby increasing deposition rates while minimizing distortion and metallurgical property alteration.
2Temperature
If Joule heating is used for wire preheating, then wire preheating is achieved, but high energy losses and undesirable arcing occur
Solution Approach 1:
The patent substitutes Joule heating (resistive heating through current flow) with electric arc heating. The tungsten electrode generates an electric arc that directly heats the welding wire, providing more efficient and controlled preheating with reduced energy losses and without the undesirable arcing issues associated with Joule heating methods.
3Device complexity
If conventional welding is performed without wire preheating, then the process is simple, but surface oxides and contaminants remain on the wire
Solution Approach 1:
The electric arc preheating process simultaneously performs preliminary cleaning of the welding wire by removing surface oxides and contaminants through the high-temperature arc. This preliminary action occurs before the wire contacts the molten pool, ensuring a cleaner weld interface without significantly increasing system complexity.
4Productivity
If wire preheating is implemented, then deposition rates increase, but additional equipment and system complexity are required
Solution Approach 1:
The patent integrates the preheating function into the existing welding system by using a tungsten electrode that serves dual purposes: generating the welding arc and providing preheating through a separate arc path. This multi-functional approach enables wire preheating without requiring entirely separate equipment, thereby increasing deposition rates while limiting the increase in 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 electric arc preheating system achieves higher deposition rates and prevents weld defects by efficiently preheating the welding wire, reducing hydrogen porosity, and maintaining performance across different materials, with the ability to retrofit into existing welding systems.
Implementation Method 1
The use of electric arcs generated by tungsten electrodes to preheat welding wire
Implementation Method 2
removing surface oxides and contaminants, thereby enhancing deposition rates
Data Source
AI summary
An apparatus and system for preheating and removing surface oxidation of welding wire using electric arcs one via one or more tungsten electrodes is disclosed. The preheating and cleaning electric arcs may occur between tungsten electrodes, or between one or more tungsten electrodes and welding wire. Electric arc preheating of welding wire allows increased efficiency and deposition rates.