Kamm Paul Hans, Börner Stephan, Neu Tillmann Robert, Schlepütz Christian Matthias, Dittrich Dirk, Banhart John, García-Moreno Francisco
Institute of Applied Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109, Berlin, Germany.
Institute of Materials Science and Technology, Technische Universität Berlin, Hardenbergstraße 36, 10623, Berlin, Germany.
Adv Sci (Weinh). 2025 Mar;12(9):e2413108. doi: 10.1002/advs.202413108. Epub 2025 Jan 13.
The phenomena occurring in a weld seam during advancement of a laser beam over a metallic component are still under dispute. The occurrence and evolution of porosity and the occasional blowout of melt need to be understood. Here, a recently developed X-ray tomoscopy setup is applied, providing one hundred 3D images per second to capture the temporal evolution of the melt pool in an AlSi9Cu3(Fe) die-casting while a laser beam advances. The number of pores, their size, shape and distribution are quantified with 10 ms time resolution and reflect a complex dynamic pattern. Apart from conventional welding, a variant involving a dynamic beam modulation superimposed onto the linear motion is studied. Reductions of porosity and surface roughness are observed and explained by increased pore mobility and stepwise degassing as the beam repeatedly cuts through pores. The keyhole formed in the melt pool integrated over 10 ms is represented in 3D.
在激光束在金属部件上移动过程中，焊缝中出现的现象仍存在争议。孔隙的产生和演变以及熔体偶尔的喷出情况需要弄清楚。在此，应用了一种最近开发的X射线断层扫描装置，每秒提供一百张三维图像，以捕捉在AlSi9Cu3(Fe)压铸过程中激光束移动时熔池的时间演变。孔隙的数量、大小、形状和分布以10毫秒的时间分辨率进行量化，并反映出一种复杂的动态模式。除了传统焊接外，还研究了一种在线性运动上叠加动态光束调制的变体。观察到孔隙率和表面粗糙度降低，并通过光束反复穿过孔隙时孔隙迁移率增加和逐步脱气来解释。在10毫秒内积分得到的熔池中的匙孔以三维形式呈现。
