Modeling keyhole oscillations during laser deep penetration welding at different spatial laser intensity distributions
Modeling keyhole oscillations during laser deep penetration welding at different spatial laser intensity distributions
复制标题
不同空间激光强度分布下激光深熔焊接过程中小孔振荡的建模
DOI：
10.1007/s11740-014-0594-3
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Vollertsen
中科院分区：
文献类型：
--
作者：
Vollertsen
在深熔激光束焊接过程中，过程动力学对气孔等不良焊缝缺陷的形成有重要影响。锁孔在焊接过程中的动态变化是影响焊接过程的主要因素之一。影响小孔动力学的因素之一是激光强度分布。为了更好地理解焊缝缺陷的形成，本文研究了激光聚焦空间强度分布对锁眼动力学的影响。给出了一种解析性描述，为快速计算不同空间激光强度分布下的锁孔动力学提供了可能。计算的锁孔动力学频率分析表明，与高斯光束分布相比，顶帽强度分布导致锁孔振荡的最大频率更高。声发射过程观测实验证实了模型的结果。
Process dynamics have a significant effect on the formation of unwanted weld defects like pores in deep penetration laser beam welding. The dynamics of the keyhole, typically evolving in the process, are assumed to be one of the main influencing factors on the welding process. One of the factors influencing the keyhole dynamics is the laser intensity distribution. In order to get a better understanding of the formation of weld defects, the influence of the focal spatial laser intensity distribution on keyhole dynamics is investigated in this work. An analytical description is presented, that offers the possibility to quickly calculate the keyhole dynamics for different spatial laser intensity distributions. Frequency analysis of the calculated keyhole dynamics show that a top hat intensity distribution leads to higher maximum frequencies of the keyhole oscillations compared to a Gaussian beam profile. Experiments using process observation of acoustic emissions confirm the model´s results.