Multi-Coated Welding Electrode Without Copper Contamination
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Solution Overview
Problem
Traditional copper-coated welding electrodes face issues such as copper contamination in welds, leading to mechanical property degradation and environmental pollution, while also posing health hazards due to copper oxide emissions.
Innovation Solution
A welding electrode with a core wire and two or more coatings, where the coatings include an electrically conductive layer with elements other than copper and an additional functional coating containing antimony or its oxides to reduce friction, stabilize arcs, modify weld metal microstructure, and adjust surface tension, thereby eliminating the need for copper and improving 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 degrades mechanical properties and causes environmental pollution
Solution Approach 1:
The patent extracts and removes copper from the coating composition entirely, replacing it with alternative materials (zinc, aluminum, tin, or their alloys) that provide electrical conductivity without causing copper contamination in the weld metal, thereby eliminating the harmful effects while maintaining the beneficial electrical properties
Solution Approach 2:
The patent employs composite coating materials consisting of zinc, aluminum, tin, or their alloys combined with other elements to achieve the desired electrical conductivity and welding performance without using copper, thus creating a composite material system that eliminates harmful copper contamination while maintaining functional performance
2Use of energy by moving object
If copper coating is used on welding electrode, then electrical conductivity is improved, but copper oxide emissions pose health hazards
Solution Approach 1:
The patent completely removes copper from the coating formulation, replacing it with alternative metals (zinc, aluminum, tin) that do not generate harmful copper oxide emissions during welding, thereby eliminating the health hazards associated with copper oxide inhalation while maintaining adequate electrical conductivity for arc stabilization
3Ease of manufacture
If traditional single-layer coating is used, then manufacturing is simple, but welding performance optimization is limited
Solution Approach 1:
The patent divides the coating into multiple functional layers with distinct compositions and purposes - an inner layer providing base protection and electrical conductivity, and an outer layer optimized for arc stabilization and weld quality - allowing each layer to be independently optimized while maintaining manufacturing feasibility through sequential application processes
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-related issues, enhances mechanical properties, and minimizes environmental impact by stabilizing arcs, improving weld metal quality, and reducing slag formation, while maintaining or exceeding the benefits of copper coatings.
Implementation Method 1
an electrically conductive coating including one or more electrically conducting elements or compounds
Implementation Method 2
one or more additional elements or compounds adapted to reduce friction of the welding electrode
Implementation Method 3
stabilize an arc formed from the welding electrode
Implementation Method 4
modify a microstructure of a weld metal formed from the welding electrode
Implementation Method 5
modify a surface tension of a molten droplet formed from the welding electrode
Data Source
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 reduce friction of the welding electrode, stabilize an arc formed from the welding electrode, modify a microstructure of a weld metal formed from the welding electrode and/or 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.