Functional Welding Electrode Coatings to Eliminate Copper Contamination
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Solution Overview
Problem
Traditional copper-coated welding electrodes face issues such as copper contamination in welds, leading to reduced mechanical properties and environmental pollution, while also posing health risks due to copper oxide emissions.
Innovation Solution
A welding electrode with a solid core wire and two or more coatings, including an electrically conductive coating without copper and an additional functional coating containing antimony or its oxides, which modifies the surface tension of molten weld metal droplets, reducing copper usage and enhancing welding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If copper coating is used on welding electrode, then electrical conductivity is improved, but copper contamination in welds increases leading to reduced mechanical properties
Solution Approach 1:
The coating is divided into multiple functional layers: an inner electrically conductive layer (free of copper or with reduced copper content) and an outer functional layer containing alloying elements. This segmentation allows the inner layer to provide electrical conductivity while the outer layer prevents copper contamination and enhances weld metal properties.
Solution Approach 2:
Copper is extracted or completely removed from the coating composition. The patent specifically eliminates copper from the coating to prevent copper cracking and improve weld metal mechanical properties, while maintaining electrical conductivity through alternative conductive materials in the inner layer.
2Use of energy by moving object
If copper coating is used on welding electrode, then electrical conductivity is improved, but environmental pollution and health risks increase due to copper oxide emissions
Solution Approach 1:
Copper is extracted or completely removed from the coating composition. The patent specifically eliminates copper to prevent copper cracking and improve weld metal mechanical properties, while maintaining electrical conductivity through alternative conductive materials in the inner layer.
Solution Approach 2:
The chemical composition parameters of the coating are changed by eliminating copper and using alternative materials. This parameter change reduces or eliminates copper oxide emissions during welding, addressing environmental and health concerns while maintaining functional performance.
3Productivity
If functional coating with antimony is added, then welding performance is enhanced, but coating complexity increases
Solution Approach 1:
The coating is divided into multiple functional layers: an inner electrically conductive layer (free of copper or with reduced copper content) and an outer functional layer containing alloying elements. This segmentation allows the inner layer to provide electrical conductivity while the outer layer prevents copper contamination and enhances weld metal properties.
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 reduces copper cracking, improves mechanical properties, and minimizes environmental and health hazards by eliminating copper from the coating, while maintaining electrical conductivity and enhancing welding efficiency.
Implementation Method 1
an additional functional coating containing antimony or its oxides, which modifies the surface tension of molten weld metal droplets
Implementation Method 2
an electric arc is created when a voltage is applied between a consumable weld electrode... and the workpiece. The arc melts a tip of the metal wire, thereby producing droplets of the molten metal electrode
Data Source
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AI summary
The disclosed technology generally relates welding electrodes, and more particularly to consumable welding electrodes having functional coatings. In one aspect, a welding electrode comprises a core wire having a base metal composition and two or more coatings covering at least a portion of the core wire. The two or more coatings comprise an electrically conductive coating including one or more electrically conducting elements or compounds in addition to or other than copper (Cu). The two or more coatings additionally comprises an additional functional coating including one or more additional elements or compounds adapted to modify a surface tension of a molten droplet formed from the welding electrode. In another aspect, a method of manufacturing a welding electrode comprises providing the core wire having the base metal composition and forming the two or more coating layers.