Laser-Structured Metal Substrate Joining for Cohesive Polymer Bonds
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Solution Overview
Problem
Existing methods for assembling substrates and parts using light sources with monochromatic and polychromatic components result in interfacial failures and require multiple light sources, limiting mechanical properties such as tensile and shear strength.
Innovation Solution
A method involving pulsed structuring laser beam with wavelengths between 200 and 11,000 nm, used to create a structured surface on the substrate with a pattern of grooves, allowing a single light source for welding and achieving cohesive failures during tensile tests, enhancing tensile and shear strength by creating a dense, high-roughness surface for improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple light sources (monochromatic and polychromatic) are used for assembling, then adhesion between substrate and part is improved, but device complexity increases
Solution Approach 1:
The patent combines the structuring function and welding function into a single laser source. The laser performs both the substrate structuring (creating micro-grooves for adhesion) and the welding (melting fusible material) operations, eliminating the need for separate monochromatic and polychromatic light sources while maintaining strong adhesion between substrate and part
Solution Approach 2:
The laser device is designed to perform multiple functions: it structures the substrate surface to create adhesion-enhancing patterns and simultaneously performs the welding operation by melting the fusible material. This multi-functional approach replaces the need for multiple specialized light sources
2Strength
If multiple light sources are used for assembling, then adhesion is improved, but the number of components increases
Solution Approach 1:
The patent merges the substrate structuring process and the welding process into a single integrated laser operation. The laser creates micro-grooves on the substrate surface and simultaneously melts the fusible material to form strong joints, achieving high tensile strength while simplifying the overall assembly process and reducing component count
3Strength
If substrate surface is structured to improve adhesion, then mechanical properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces complex mechanical structuring methods with laser-based structuring. The laser beam creates precise micro-grooves and patterns on the substrate surface through ablation or melting, achieving enhanced adhesion properties without requiring mechanical contact or complex tooling, thereby simplifying the manufacturing process
Solution Approach 2:
The patent uses laser parameters (wavelength, pulse duration, power, scanning speed) to control the structuring process. By adjusting these parameters, the laser creates optimal surface patterns for adhesion enhancement while maintaining manufacturing simplicity and flexibility
4Strength
If laser pulses of less than 1 μs are used for structuring, then adhesion is improved, but energy requirements increase
Solution Approach 1:
The patent uses pulsed laser operation with pulse durations of less than 1 μs. This periodic action allows the laser to deliver high peak power for effective structuring while maintaining low average power consumption. The pulsed regime enables precise energy delivery to create adhesion-enhancing patterns without excessive heat accumulation or energy waste
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 achieves higher mechanical properties with cohesive failures, improved tensile and shear strength, and eliminates the need for multiple light sources, ensuring strong adhesion between the substrate and part without interfacial failures.
Implementation Method 1
providing a pulsed structuring laser capable of generating a pulsed structuring laser beam capable of engraving the upper surface of the substrate in a non-through manner
Implementation Method 2
heating, by means of the heating device, the fusible material so as to reach in the fusible material, a temperature sufficient to melt at least a portion of it
Data Source
AI summary
A method of assembling a substrate with a part is provided. The method includes a step of structuring the substrate by a pulsed laser. In one example, the substrate is metallic and the part is polymer-based. The structuring step engraves grooves into the substrate in a pattern determined by the relative motion of the beam and the substrate. The pattern is configured to provide improved adhesion between the structured substrate and a part after assembling the substrate and the part by laser welding. The method of assembling may further include a pre-treatment step of the structured surface to allow improve laser absorption during the welding assembling.