Laser Debrazing of Brazed Joints for Component Reuse
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Solution Overview
Problem
Current methods for dismantling cohesive metal connections, such as those in car bodies, are either costly, time-consuming, or not economically viable, leading to significant greenhouse gas emissions during recycling and limiting the reuse of components.
Innovation Solution
A method involving laser soldering to non-destructively separate metal components by directing a laser beam at the cohesive connection to melt the solder material while avoiding the component material's melting, followed by removal using a fluid flow with kinetic energy, allowing for the reuse of separated components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If established joining methods (screw, weld) are used, then strong mechanical connection is achieved, but non-removable and costly/dis time-consuming for disassembly
Solution Approach 1:
The joint is segmented into three distinct components: base material, solder material, and filler material. This segmentation allows selective removal of the solder layer while preserving the base materials, enabling easy disassembly while maintaining strong initial connection through the solder-filler-material interface
Solution Approach 2:
The solder material's melting point is deliberately chosen to be between the base material melting point and room temperature. This parameter change enables selective melting and removal of the solder layer through controlled heating, allowing non-destructive disassembly while maintaining joint strength during assembly
2Ease of repair
If thermal recycling (melting down) is used, then metal reuse is achieved, but significant greenhouse gas emissions occur
Solution Approach 1:
The solder material is extracted from the joint through selective melting and removal, separating it from the valuable base materials. This extraction enables reuse of the base materials without complete melting and recycling, significantly reducing greenhouse gas emissions associated with thermal recycling while maintaining component integrity
Solution Approach 2:
The solder material is discarded as a removable layer while the base materials are recovered for reuse. This selective discarding and recovering approach allows direct reuse of high-value components without energy-intensive melting and recasting, reducing emissions while maintaining material circularity
3Productivity
If solder material removal is attempted, then joint separation is achieved, but component material may melt or microstructure altered
Solution Approach 1:
The heating process is localized to the solder material layer through controlled energy application. The solder material's intermediate melting point enables selective local melting without affecting the base materials, ensuring separation efficiency while preserving component integrity and microstructure
Solution Approach 2:
The solder material undergoes phase transition from solid to liquid at its characteristic melting point, which is between the base material melting point and room temperature. This phase transition enables clean separation through controlled heating while the base materials remain in solid phase, maintaining their structural integrity
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
Enables the safe, effective, and economical separation of soldered connections without damaging the components, reducing greenhouse gas emissions and allowing for further mechanical processing and reuse.
Implementation Method 1
the focal spot of a laser beam is directed at a joining area of the metallurgical joint with a power density sufficient to melt a solder material and sufficient to at least prevent the melting of the component material
Implementation Method 2
A temperature should be reached at which the solder material has a viscosity suitable for removal
Implementation Method 3
the molten solder material is removed from the joining area by means of at least one fluid flow that has kinetic energy
Implementation Method 4
The liquid solder material is thereby blown away from the component surface
Data Source
AI summary
In the method for the non-destructive separation of a soldered joint on at least two metallic components joined by soldering, so that the separated components are available for mechanical processing in a closed loop, the focal spot of a laser beam is directed at a joining area of the bonded joint with a power density sufficient to melt the solder material and at least sufficient to prevent melting of the component material, and with a forward movement of the focal spot. The molten solder material is removed from the joining area by means of at least one fluid flow possessing kinetic energy, and the components are separated from each other either continuously or only after the bonded solder joint has been completely severed. At least one of the components is then reused.