Cutting thick plates is affected not only by the laser power but also by the cut kerf width and the melt flow dynamics that determine the ejection of the molten material. Employing the same laser beam intensity distribution for various thicknesses is the limiting factor when cutting thicker plates. This paper investigates fiber laser fusion cutting of 25 mm thick aluminium with dynamic beam shaping (DBS). While both static and longitudinal dynamic intensity distributions fail to cut this thickness with a 4 kW laser power, a cut through is achieved using annular and elliptical intensity distributions. However, an improvement of 45&nbsp;% in cutting speed can be achieved using an elliptical intensity distribution compared to an annular one. In order to understand the effect of the beam shape, an infrared thermal camera is used to study lateral heat propagation when using different process parameters. The more efficient heat propagation in the cutting direction employing elliptical intensity distribution decreases the power losses compared to the annular intensity distribution. Moreover, to analyze the melt flow when changing the DBS frequency, high-speed imaging is utilized to observe the molten material inside the cut kerf. Finally, the cut edge quality is investigated for different cutting conditions.

Cutting Thick Aluminium Plates Using Laser Fusion Cutting Enhanced by Dynamic Beam Shaping

Laser surface texturing (LST) has been demonstrated to be an effective method to induce the icephobic characteristics on metallic surfaces, which can be exploited for several applications including aerospace, energy, and communication. Using femtosecond (fs) lasers, highly-repeatable multiscale surface topographies comprised of microscale patterns and self-organized micro/nanoscale features such as laser-induced periodic surface structures (LIPSS) can be fabricated. This study investigated the influence of multi-scale surface textures produced on aluminum plates by fs-LST on the anti-icing performance. Firstly, surface features with different morphologies were fabricated by varying the fs-LST process parameters such as hatch spacing, scanning speed and the number of scanning passes. Surface topography of the textures was characterized using optical profilometry and scanning electron microscopy whereas Energy Dispersive Spectroscopy was used for analyzing the chemical composition. The wettability of the surfaces was studied using static, advancing and receding contact angle measurements. Further, icephobicity evaluation was carried out using two main techniques: &nbsp;i) by measuring the freezing time delay using an optical goniometer equipped with a subzero Peltier cell and, ii) by measuring the ice adhesion strength using an ice adhesion set-up based on horizontal shear stress application. Icing analysis and ice adhesion tests indicated that optimal microscale patterns overlapped with LIPSS features effectively increase the freezing time, mostly through the existence of the Cassie-Baxter regime at the interface between ice and textured surface, with a beneficial reduction in the ice adhesion strength. These results highlight that surface texturing by fs lasers is effective in achieving icephobic surfaces.

Effect of Femtosecond Laser Textured Surface Morphology on the Icephobic Characteristics of Aluminium

Beam shaping Track: Improving Laser Cutting with Beam Shaping

technical paper

**General Chair Welcome**

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Welcome to ICALEO® 2023!
	
We were excited to host the world’s leading international conference on Lasers and Electro-Optics in Chicago. The Laser has been shown to have the potential to revolutionize solutions for major global challenges like energy usage and supply, global warming, and CO2 footprint. Even the fusion energy breakthrough is based on laser technology. The conference, with peer-reviewed scientific and technical presentations, focused on the newest results in Micro Applications, Macro Applications, Additive Manufacturing, Beam Shaping and Frontiers in Laser Applications. Additionally, the Battery-Manufacturing Track gave an overview of the process combined with the newest advances in laser application results. 

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Managing Director, Precitec GmbH

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ICALEO 2023

ICALEO® brings together the brightest minds, seasoned professionals, and pioneering researchers from around the world. With a laser-focused agenda, ICALEO offers an exceptional platform to delve into the cutting-edge advancements, diverse applications, and transformative research that define lasers and electro-optics.

Sylvie Castagne

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Presentations

Cutting Thick Aluminium Plates Using Laser Fusion Cutting Enhanced by Dynamic Beam Shaping

Effect of Femtosecond Laser Textured Surface Morphology on the Icephobic Characteristics of Aluminium

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