USP Laser Metallurgical Sample Grinding Pattern Preparation
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Solution Overview
Problem
Conventional methods for preparing metallurgical grinding patterns are time-consuming and laborious, often resulting in undifferentiated dark surfaces or excessive contrast differences, making it difficult to distinguish weld seams, heat influence zones, and basic structures, and require harmful chemical etching agents, which can obscure narrow joining gaps.
Innovation Solution
The method employs an ultra-short pulse (USP) laser for surface cleaning, contrasting, and laser etching, eliminating the need for chemical etching and mechanical processing, allowing a single USP laser to perform multiple steps with adjusted parameters for smoothing, revealing joining gaps, enhancing contrast, and creating thermal annealing colors without material removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional mechanical grinding and polishing processes are used, then the surface can be prepared, but the process is time-consuming and laborious
Solution Approach 1:
The patent replaces conventional mechanical grinding and polishing processes with laser-based processing. The laser beam performs surface cleaning, contrasting, and etching functions that traditionally required multiple mechanical steps, thereby eliminating time-consuming manual operations and significantly reducing preparation time.
Solution Approach 2:
The patent combines multiple separate preparation steps (cleaning, contrasting, and etching) into a single integrated laser processing step. By using one laser system to perform all three functions sequentially or simultaneously, the patent eliminates the need for multiple separate machines and operations, thereby improving productivity and reducing processing time.
2Manufacturing precision
If chemical etching agents are used, then the surface can be etched, but harmful chemicals are required and narrow joining gaps are obscured
Solution Approach 1:
The patent replaces chemical etching with laser-induced thermal etching. The laser beam heats the surface to create thermal annealing colors and controlled oxidation without requiring chemical reagents. This substitution eliminates harmful chemicals while providing superior visualization of narrow joining gaps through thermal contrast mechanisms.
Solution Approach 2:
The patent changes the etching mechanism from chemical to thermal parameters. By controlling laser power, pulse duration, and scanning speed, the process creates controlled thermal effects that produce visible contrast without chemical contamination. The thermal annealing colors and oxidation patterns provide clear visualization of microstructural features including narrow joining gaps.
3Ease of manufacture
If multiple grinding and polishing steps are used, then surface preparation can be achieved, but the process requires various tools and is complex
Solution Approach 1:
The patent employs a single laser system that performs multiple functions: surface cleaning, contrasting, and etching. This multi-functional approach replaces the need for separate grinding machines, polishing devices, and chemical etching equipment, thereby simplifying the overall process and reducing device complexity while maintaining ease of manufacture.
Solution Approach 2:
The patent merges three distinct preparation functions (cleaning, contrasting, etching) into one integrated laser processing system. This consolidation eliminates the complexity of coordinating multiple separate machines and operations, making the manufacturing process simpler and more straightforward while reducing the number of required processing machines.
4Shape
If conventional polishing is used, then the surface can be smoothed, but undifferentiated dark surfaces are created that do not allow distinction between features
Solution Approach 1:
The patent performs cleaning and contrasting in continuous sequence without interrupting the laser beam operation. The cleaning step prepares the surface by removing contaminants, and the contrasting step immediately follows to create thermal annealing colors and oxidation patterns. This continuous process ensures both surface smoothness and feature differentiation are achieved without losing either property.
Solution Approach 2:
The patent uses different laser parameters for cleaning versus contrasting. For cleaning, higher power and longer pulse duration are used to remove material and smooth the surface. For contrasting, lower power and shorter pulse duration create thermal annealing colors and oxidation patterns that differentiate features. By dynamically adjusting parameters, both surface smoothness and contrast are optimized simultaneously.
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 and accelerates the grinding pattern preparation, providing clear visualization of weld seams and structural features, eliminating the need for multiple tools and hazardous chemicals, while being flexible for various sample conditions and existing grinding patterns.
Implementation Method 1
cleaning R the surface of the sample having an ablation depth of between 1 to 50 μm to reveal joining gap structures
Implementation Method 2
contrasting K the cleaned surface of the sample with an ablation depth of between 0.5 to 20 μm to make joining structures visible
Implementation Method 3
laser etching A the contrasted surface of the sample by ablation-free creation of a thermal annealing color structure
Implementation Method 4
creation of a thermal annealing color structure
Implementation Method 5
laser etching A the contrasted surface of the sample by ablation-free creation of a thermal annealing color structure and/or surface oxidation
Data Source
AI summary
The invention relates to a method and a device for preparing a grinding pattern for a metallurgical sample (1), wherein, after preparing the sample (1), a thermal contrasting of the surface is carried out by laser equipment, wherein, using a USP laser (2), at least the following processing steps are carried out:cleaning (R) the surface of the sample (1) with an ablation depth of between 1 to 50 μm to reveal joining gap structures (300);contrasting (K) the cleaned surface of the sample (1) with an ablation depth between 0.5 to 20 μm to make joining structures (400) visible;laser etching (A) the contrasted surface of the sample (1) via the ablation-free creation of a thermal annealing color structure (500) and/or surface oxidation.