High-speed synchrotron X-ray video of the laser beam cutting process in a 2 mm thick sheet of aluminium

The generation of low surface roughness of the cut edge during laser beam cutting is a challenge. The striation pattern, which determines the surface roughness, can be distinguished into regular and interrupted striations, the latter resulting in an increased surface roughness. In order to analyse their formation, the space- and time-resolved cutting front geometry and melt film thickness were captured during laser beam fusion cutting of 2 mm thick samples of aluminium with a framerate of 1000 Hz by means of high-speed synchrotron X-ray imaging.
Red, yellow and white colored areas show the shape of the cutting front and cutting kerf; P = 1 kW, v = 1.75 m/min.

激光切割过程中实现切口边缘低表面粗糙度始终是一项技术挑战。决定表面粗糙度的切缝条纹形貌可分为规则条纹与间断条纹两类，其中间断条纹会导致表面粗糙度升高。为分析该条纹形貌的形成机制，本研究通过帧率为1000 Hz的高速同步辐射X射线成像（high-speed synchrotron X-ray imaging）技术，在对2毫米厚铝板开展激光熔割实验期间，同步采集了时空分辨的切割前沿几何形貌与熔膜厚度数据。

图中红、黄、白三色区域分别显示切割前沿与切缝的形貌；实验参数设置为：激光功率P=1 kW，切割速度v=1.75 m/min。