Cu-Al Multimetal Welding Wire for High-Aluminum Weldability
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Solution Overview
Problem
Existing methods for producing welding materials with high aluminium content are limited by the impossibility of casting such materials due to their low casting properties, resulting in suboptimal mechanical properties, corrosion resistance, and weldability.
Innovation Solution
A method of producing multimetal wires with a CuAl content by bundling and drawing aluminium wires within copper tubes, allowing for a higher aluminium content without the need for casting, and resulting in improved mechanical properties and weldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the aluminium content in copper welding wires is increased to improve mechanical properties and corrosion resistance, then the casting properties deteriorate, making the casting process impossible
Solution Approach 1:
The wire is divided into multiple separate aluminium strands (5 strands in the example) that are bundled together within a copper tube. This segmentation allows each aluminium strand to maintain its individual integrity while achieving the desired high aluminium content (12% by mass) in the composite wire structure, bypassing the casting limitation.
Solution Approach 2:
The invention creates a composite multimetal wire structure consisting of aluminium strands bundled within a copper tube. This composite approach allows combining materials with different properties (high aluminium content for strength and corrosion resistance, copper for ductility and weldability) without requiring casting of the high-aluminium alloy itself.
2Reliability
If multi-metal wires with high aluminium content are produced to improve corrosion resistance, then the production complexity increases due to skipping continuous casting
Solution Approach 1:
The production process uses segmented aluminium wires (5 separate strands) that are bundled together. This segmentation simplifies the production approach by avoiding the need for complex continuous casting equipment, as each strand can be produced separately and then assembled into the final multimetal wire structure.
Solution Approach 2:
The composite wire structure allows combining corrosion-resistant aluminium strands with copper tube, achieving improved corrosion resistance through material selection rather than through complex production processes. The copper tube provides additional corrosion protection and structural integrity.
3Ease of manufacture
If traditional casting methods are used for producing welding materials, then the production process is simpler, but the mechanical properties and weldability are suboptimal for high aluminium content materials
Solution Approach 1:
Instead of casting a homogeneous high-aluminium alloy, the invention segments the aluminium into separate strands that are bundled within a copper tube. This segmentation allows the use of simpler production methods (drawing and bundling) while achieving superior mechanical properties through the composite structure and optimal aluminium content distribution.
Solution Approach 2:
The composite multimetal wire structure combines the advantages of aluminium (high strength and corrosion resistance) with copper (good ductility and weldability). This composite approach achieves optimal mechanical properties and weldability without requiring complex casting processes for high-aluminium alloys.
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 method enables the production of welding materials with enhanced mechanical properties, corrosion resistance, and improved weldability, allowing for lower current settings during TIG welding.
Implementation Method 1
drawn to a diameter of ø2.15 mm while maintaining changes of drawing die diameter of 0.25 mm
Data Source
AI summary
A method of producing a multimetal wire containing CuAI, characterized in that in the first stage five sections of aluminium wires of the same length and with a diameter of ø2.15 mm each are placed directly in a thin-walled copper tube with a diameter of ø8 mm and a wall thickness of 0.8 mm, drawn to a diameter of ø2.15 mm while maintaining changes of drawing die diameter of 0.25 mm, followed by a second stage which includes repeating the first stage.