Dynamic beam modulation for optimization of industrial laser processes (FastShape)

7使用高效固态激光器（波长约为1000 nm）进行激光材料加工的两个困难过程1微米）是该项目的重点：一方面，用高效的固体激光器对厚度为8-20毫米的钢板进行高质量的熔融切割一直是许多工业用户的愿望。另一方面，向电动汽车的转变要求厚度在0.5-3 mm范围内的电铜片采用高质量和高效的连接工艺。厚钢板的激光切割和使用固态激光器的铜的激光焊接仍然显示出工艺不稳定性，这导致质量和性能方面的巨大缺陷，IFSW的基础研究已经表明，这些不稳定性可以通过影响相互作用区（IA区）的几何形状来抑制激光器与材料的结合，并且可以实现加工结果的优化。这一点已经用IFSW的X射线系统进行了实验验证，该系统在欧洲是独一无二的。使用X射线技术和IFSW自己的偏振测角仪，可以在加工过程中记录和显示IA区的几何形状。IWS的经验研究表明，使用动态光束调制可以显著提高切割和焊接工艺的质量和性能。在这里使用的系统工程意义上的动态光束调制特别包括激光束相对于其静态传播轴的快速时间和空间偏转，该静态传播轴根据加工速度相对于被加工材料移动，并且如果需要，还包括位置相关的高频功率控制。动态射束调制对IA的几何形状的作用的物理机制-为了使在IWS中使用的动态射束调制方法适应和优化，在社会工作者联合会开发的诊断技术的帮助下，与合作伙伴开展合作。目的是能够针对给定的应用主动地且可再现地调节IA区的几何形状，并且因此能够证明切割和焊接的特定示例性应用的提高的质量和性能。

7Two difficult processes of laser material processing with efficient solid-state lasers (at a wavelength of approx. 1 µm) are the focus of this project: On the one hand, the fusion cutting of steel sheets with thicknesses of 8-20 mm with good quality with efficient solid-state lasers has long been a wish of many industrial users. On the other hand, the switch to electromobility requires high-quality and efficient joining processes for electro-copper sheets with thicknesses in the 0.5-3 mm range. Both laser cutting of thick steel sheets and laser welding of copper with solid-state lasers still show process instabilities, which lead to massive deficits in quality and performance, thus hindering a broad industrial implementation of these applications.Fundamental investigations at IFSW have already shown that these instabilities can be suppressed by influencing the geometry of the interaction zone (IA-zone) of the laser with the material and that an optimization of the processing results can be achieved. This was verified experimentally with the X-ray system of IFSW, which is unique in Europe. Using X-ray technology and IFSW's own polarization goniometer, the geometry of the IA-zone can be recorded and displayed during machining.Empirical studies at the IWS have shown that a significantly improved quality and performance can be achieved for cutting and welding processes by using dynamic beam modulation. Dynamic beam modulation in the system engineering sense used here includes in particular the fast temporal and spatial deflection of a laser beam with respect to its static propagation axis moved in relation to the processed material according to the processing speed and, if required, a position-dependent high-frequency power control.In the planned research project, the physical mechanisms of action of the dynamic beam modulation on the geometry of the IA-zone and the resulting process result are to be identified in order to adapt and optimize the methods of dynamic beam modulation used at the IWS to the exemplary applications of the cooperation partners with the aid of the diagnostic techniques developed at the IFSW for implementation. The aim is to be able to adjust the geometry of the IA-zone actively and reproducibly for the given applications and thus to be able to demonstrate an increased quality and performance of the specified exemplary applications of cutting and welding.