Multilayer Metal Pipe Forming for Stable Metallurgical Bonding
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Solution Overview
Problem
Current methods for preparing multilayer metal composite pipes face challenges such as poor quality, high production costs, and low efficiency due to issues like inconsistent bonding, residual stress, and difficulty in achieving metallurgical bonding between metals.
Innovation Solution
A method involving external and internal grinding of metal pipes, followed by cleaning, assembly, high-speed friction welding, four-roller cross-rolling, and two-roller cold-rolling to achieve metallurgical bonding and reduce diameter, with optional heat treatment and precise cold-rolling steps to enhance bonding and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If explosive compositing method is used to connect metals, then bonding is achieved quickly, but the shape control is poor and quality is low
Solution Approach 1:
The patent replaces the explosive mechanical connection method with a friction stir welding process that uses mechanical friction and stirring to achieve metallurgical bonding. The friction stir welding tool applies rotational friction to heat and mix the metal surfaces, then applies pressure to forge a strong bond, eliminating the shape control problems of explosive welding while maintaining rapid bonding capability
Solution Approach 2:
The patent changes the bonding parameters from explosive impact to controlled friction heat and pressure. By adjusting the rotational speed, feed rate, and axial force of the friction stir welding tool, the process achieves consistent metallurgical bonding with excellent shape control and joint quality
2Reliability
If casting compositing method is used to inject liquid metals, then bonding layer quality improves, but new phases appear causing interface instability
Solution Approach 1:
The patent replaces the casting liquid metal injection method with friction stir welding, which uses mechanical friction and stirring to create a solid-state metallurgical bond. This avoids the formation of unwanted intermetallic phases that occur during casting, resulting in a stable and reliable bonding interface
Solution Approach 2:
The patent changes the bonding state from liquid-phase casting to solid-state friction stir welding. By controlling the temperature, pressure, and stirring parameters, the process achieves a stable bonding interface without forming harmful new phases, ensuring long-term compositional stability
3Ease of manufacture
If mechanical compositing method is used to expand pipe body, then assembly is achieved, but metallurgical bonding cannot be achieved and residual stress causes bonding failure
Solution Approach 1:
The patent replaces simple mechanical expansion with friction stir welding, which combines mechanical friction heating with stirring and pressure application. This transforms the bonding mechanism from purely mechanical interference fit to metallurgical bonding, eliminating residual stress problems while maintaining assembly capability
Solution Approach 2:
The patent changes the bonding mechanism from mechanical expansion to friction-based metallurgical bonding. By controlling the friction heat generation, stirring intensity, and pressure parameters, the process achieves strong, stress-free bonds that maintain assembly capability while eliminating bonding failure risks
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
This method enables the mass production of seamless composite pipes with strong bonding between layers, improved production efficiency, and higher product precision, while reducing production costs and enhancing the mechanical properties and corrosion resistance of the composite pipes.
Implementation Method 1
a friction stir welding tool is used to sequentially perform friction stir welding on the inner surface and the outer surface of each joint of the multi-layer metal pipe
Implementation Method 2
the friction stir welding tool is used to sequentially perform friction stir welding
Implementation Method 3
applying pressure to forge a strong bond
Implementation Method 4
a friction stir welding tool is used to sequentially perform friction stir welding on the inner surface and the outer surface of each joint of the multi-layer metal pipe
Data Source
AI summary
A method for preparing a multilayer metal composite pipe includes steps of: internally and externally grinding blank pipes; cleaning oil stains; assembling a multilayer metal pipe; drawing to reduce a diameter; performing high-speed friction welding at the pipe ends; performing heat treatment; performing four-roller cross-rolling; straightening; performing two-roller cold-rolling; performing cold-drawing to reduce the diameter; performing cold-expansion to reduce the diameter; performing precise cold-rolling; degreasing; brightening; performing surface grinding; cleaning dust; detecting multilayer metal interface bonding; detecting flaws; testing metal structure performance; and sizing and packaging. By cycling the cold-drawing, the cold-expansion, and the precision cold-rolling, key indicators such as product dimensional accuracy, surface quality, material properties, and crystal grain size can be collaboratively controlled, so as to achieve higher accuracy, better performance, and more outstanding extreme specifications. The present invention solves the problem of inconsistent extension due to differences in metal properties.