Laser Welding Monopolar Plates via Distortion-Induced Bends
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Solution Overview
Problem
The existing methods for media-tight welding of thin monopolar plates in fuel cell stacks are costly and time-consuming due to the need for high-precision clamping tools and multi-stage processes, often resulting in welding errors that lead to gaps and incomplete connections.
Innovation Solution
A method involving a first weld seam with a selected welding depth less than the material thickness to create a bend for linear contact, allowing a simpler clamping device and simultaneous setting of both weld seams with a laser welding machine, reducing cycle time and eliminating the need for multiple reclamping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-precision clamping tools and multi-part hold-down devices are used to achieve technical zero gaps, then manufacturing precision is improved, but device complexity and costs increase
Solution Approach 1:
The method applies preliminary welding action at specific locations to create bends that automatically establish linear contact between components. This preliminary welding creates the necessary geometric adjustment without requiring complex clamping devices, resolving the contradiction by achieving precision through process action rather than mechanical complexity
Solution Approach 2:
The welding distortion itself is utilized to create the bend that ensures linear contact. The process uses its own inherent distortion mechanism to achieve the desired geometric alignment, eliminating the need for external complex clamping tools while maintaining manufacturing precision
2Manufacturing precision
If high-precision clamping tools and multi-stage processes are used, then manufacturing precision is improved, but productivity decreases due to long cycle times
Solution Approach 1:
The preliminary welding at specific locations creates bends that automatically ensure linear contact, eliminating the need for multiple clamping and unclamping stages. This reduces the number of process steps while maintaining precision, thereby improving productivity by shortening cycle time
Solution Approach 2:
The method combines the alignment function and welding function into a single integrated process. The preliminary welding both creates the bend for alignment and prepares for the final connecting weld, merging multiple operations into fewer steps and reducing overall cycle time
3Manufacturing precision
If the entire surface is kept free of microparticles to achieve technical zero gaps, then manufacturing precision is improved, but costs increase due to cleanliness requirements
Solution Approach 1:
The method applies welding only at specific local positions rather than requiring the entire surface to be perfectly clean and in contact. By creating bends through localized preliminary welding, the process achieves linear contact at the weld seam without requiring universal surface cleanliness, reducing manufacturing costs
4Manufacturing precision
If laser welding is used to connect thin metal sheets, then manufacturing precision is improved, but welding errors occur leading to gaps and incomplete connections
Solution Approach 1:
The preliminary welding creates bends that ensure linear contact before the final connecting weld is applied. This preliminary action prevents welding errors by establishing proper geometry in advance, ensuring that the final weld creates a complete, gap-free connection without the reliability issues of direct welding
Solution Approach 2:
The preliminary welding acts as a cushioning measure that prevents potential welding defects. By creating the bend and ensuring linear contact beforehand, the process cushions against the risk of gaps and incomplete connections in the final weld, improving reliability
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 approach simplifies the welding process, reduces costs, and ensures media-tight connections by maintaining linear contact between components, minimizing defects and cycle time while using a less complex clamping device.
Implementation Method 1
setting a first weld seam on the second component, wherein a welding depth t is selected that is less than a material thickness s of the second component, with the result that a bend is formed along the first weld seam owing to the welding distortion
Implementation Method 2
a bend is formed along the first weld seam owing to the welding distortion
Implementation Method 3
setting a connecting weld seam on the first weld seam, with the result that the two components are welded to one another along the bend
Data Source
AI summary
The invention relates to a method for the media-tight connection of two plate-shaped components (1, 2), in particular two monopolar plates for the production of a bipolar plate, comprising the steps of:placing the first component (1) on a surface of a clamping device,placing the second component (2) on the first component (1),closing the clamping device,setting a first weld seam (3) on the second component (2), wherein a welding depth (t) is selected that is less than a material thickness (s) of the second component (2), with the result that a bend (5) is formed along the first weld seam (3) owing to the welding distortion, via which bend the second component (2) comes into linear contact with the first component (1),setting a connecting weld seam (4) on the first weld seam (3), with the result that the two components (1, 2) are welded to one another along the bend (5).