Weld pool shape observation in high power laser beam welding
Weld pool shape observation in high power laser beam welding
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DOI：
10.1016/j.procir.2018.08.043
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
A. Artinov;N. Bakir;M. Bachmann;A. Gumenyuk;M. Rethmeier
中科院分区：
文献类型：
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作者：
A. Artinov;N. Bakir;M. Bachmann;A. Gumenyuk;M. Rethmeier
激光焊接中熔池的几何形状对于理解熔体的动力学及其凝固行为起着重要作用。在这项研究中，对接配置的15毫米厚的结构钢和透明石英玻璃被用来观察熔池的几何形状通过高速摄像机和红外摄像机记录。观察表明，熔池的尺寸根据深度而变化。靠近熔池表面的区域呈泪滴状。在熔池深度的中间附近观察到一个鼓包区域及其随时间的变化。此外，进行了三维瞬态热流体数值模拟，以获得熔池形状和理解所观察到的鼓形效应的形成机制。该模型考虑了局部温度场、相变效应、热毛细对流、自然对流以及蒸发温度以下的材料物性随温度的变化。数值结果显示出良好的一致性，并进一步用于提高实验观察到的胀形效果的理解。
The geometry of the melt pool in laser beam welding plays a major role to understand the dynamics of the melt and its solidification behavior. In this study, a butt configuration of 15 mm thick structural steel and transparent quartz glass was used to observe the weld pool geometry by means of high-speed camera and an infrared camera recording. The observations show that the dimensions of the weld pool vary depending on the depth. The areas close to the weld pool surface take a teardrop-shape. A bulge-region and its temporal evolution were observed approximately in the middle of the depth of the weld pool. Additionally, a 3D transient thermal-fluid numerical simulation was performed to obtain the weld pool shape and to understand the formation mechanism of the observed bulging effect. The model takes into account the local temperature field, the effects of phase transition, thermo-capillary convection, natural convection and temperature-dependent material properties up to evaporation temperature. The numerical results showed good accordance and were furthermore used to improve the understanding of the experimentally observed bulging effect.