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Color marking expands the possibilities for product customization, allowing for more intricate and visually appealing designs. However, achieving vibrant color markings is not possible on all materials. In this article, we will explore how color marking is achieved using the Wattsan FL TT fiber laser marker.
How are colors created?
During the marking process, the metal is heated, forming an oxide layer on the surface. As we know, color is a result of reflected light, and this oxide layer determines how light is reflected in different wavelengths. The color produced—whether green, red, or blue—depends on the heating temperature and the thickness of the oxide layer. However, not all metals form full-colored oxides. Materials such as titanium, stainless steel, and iron are well-suited for this process and can produce a wide range of colors.
What factors influence color marking?
Several factors contribute to achieving high-quality color marking:
- Pulse modulation and power control: the ability to adjust pulse duration and power output over a broad range is crucial for color marking. The FL TT fiber laser marker allows for precise control over these parameters, making it possible to create a variety of colors.
- Hatch parameters: another key factor is adjusting the hatch parameter, which influences the marking intensity. A higher hatch density results in a lighter shade, while a lower hatch density produces a darker color.
How to determine the color of the marking?
To create a color test grid, we first design a template in CorelDRAW and import it into EzCAD. Each square in the grid is assigned a specific color, and the marking parameters are adjusted accordingly.
To achieve the desired colors:
- Uncheck the “Use Default Parameters” option in EzCAD.
- Adjust the speed, power, and frequency of the laser.
- Decrease the line spacing to increase heating time for deeper oxidation.
- Perform test markings on metal to evaluate how the settings translate into real-world colors.
Since color results depend on the material and the laser’s power output, each metal may require different parameter adjustments. By comparing the actual marking with the program’s color selection, we can determine which settings produce the most accurate results.
Why fiber lasers are best for color marking
When comparing diode-pumped lasers to fiber lasers, the latter proves to be superior for color marking. The stability of the laser emission plays a critical role in achieving consistent results. Additionally, the type and quality of the laser emitter influence the overall outcome, as they determine the material’s thermal response.
The Wattsan FL TT fiber laser operates at a wavelength of 1.64 µm and has a frequency range of 1 to 4 kHz, providing excellent precision and contrast in metal marking. Depending on the requirements, the FL TT can be equipped with laser sources from GPT, Raycus, or Max Photonics, ensuring flexibility in achieving the best marking results. Wattsan specialists can help determine the most suitable configuration based on your needs.
Conclusion
Achieving high-quality color marking requires precise control over laser parameters, including power, pulse modulation, and hatch settings. The Wattsan FL TT fiber laser marker is designed to provide optimal conditions for color marking on metals such as stainless steel, titanium, and iron. By carefully adjusting the marking parameters, it is possible to produce vibrant and stable colors. With the right configuration and expertise, fiber laser marking opens new possibilities for personalized and visually striking designs.
