X-Ray Imaging of Complex Flow Patterns during Tungsten Inert Gas Welding
X-Ray Imaging of Complex Flow Patterns during Tungsten Inert Gas Welding
复制标题
DOI：
10.1007/s11665-022-07042-6
复制
发表时间：
2022-06
影响因子：
2.3
通讯作者：
F. Wu;K. Falch;S. Ramachandran;M. Drakopoulos;W. Mirihanage
中科院分区：
文献类型：
--
作者：
F. Wu;K. Falch;S. Ramachandran;M. Drakopoulos;W. Mirihanage
熔焊技术如钨极惰性气体（TIG）焊接工艺已广泛用于工业和建筑应用中。熔池中的金属流动对凝固过程中的组织演变、化学元素分布和缺陷形成有重要影响，从而决定了焊缝的性能。然而，有限的内部流动行为的实时实验数据的可用性已被认为是一个主要的障碍，以实现一个透彻的理解和准确的熔池预测模型的发展。原位X射线成像与跟踪粒子便于我们可视化的流动演变过程中的固-液-固转变。实验结果表明，随着熔池的扩大，流动形态逐渐复杂化。熔池的形状也根据这种流动演变而改变。我们的流动模式的分析有关的驱动力的变化表明，重力产生的浮力有相当大的影响，确定在熔池周边的流体流动相比，其他地区。
Fusion welding techniques such as tungsten inert gas (TIG) welding process have been widely used in industrial and construction applications. The molten metal flow in the weld pool has a major impact on the microstructure evolution, chemical element distribution and defects formation during solidification, which subsequently determines the performance of the welds. However, limited real-time experimental data availability of internal flow behavior has been considered as a major barrier to achieve a thorough understanding and development of accurate weld pool prediction models. In situ x-ray imaging with the tracking particles facilitated us to visualize the flow evolution during the solid–liquid–solid transformation. Experimental results indicated the flow patterns are progressively becoming complicated with the expansion of the melt pool. The shape of the melt pool also changed according to this flow evolution. Our analysis of flow patterns concerning the underlying variation of the driving forces suggests that gravity-derived buoyancy has a considerable effect on determining fluid flow at the melt pool periphery compared to other regions.