Adaption of a topographical measurement system for beam welding processes with high temporal and spatial resolution
Adaption of a topographical measurement system for beam welding processes with high temporal and spatial resolution
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采用高时间和空间分辨率的梁焊接工艺形貌测量系统
DOI：
10.1016/j.jajp.2020.100025
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Sebastian
中科院分区：
文献类型：
--
作者：
Reisgen;Olschok;Jakobs;Stefan;Sawannia;Stüsser-Ufer;Sebastian
激光焊接LBW和电子束焊接EBW都是典型的束焊工艺，均为深熔焊工艺。这些过程依赖于一个蒸气毛细管，它具有各种反作用力的微妙、高度动态的平衡。由于毛细管内部温度较高，导致高强度的热光发射阻碍了对蒸气毛细管内表面的直接观察。即使使用基于高强度激光的照明和根据激光波长调整的带通滤光片，也只能观察到毛细血管开口的最上面部分。缺乏可观察性，特别是高时间分辨率来评估高度动态的效果，导致了毛细管模型的状态，这些模型实际上描述的是准静态模式，或者实现了用最先进的方法可以观察到的较少的动态效果。由斯图加特IFSW的Strahlwerkzeuge University研究所开发的地形测量系统，使用由基材的复杂折射率控制的毛细管的固有热发射过程来重建可见毛细管表面的内部几何形状。这是通过使用菲涅尔方程(Sawannia等人，2018年)描述的发射角与偏振之间的发射率相关性来实现的。测量系统利用了这样一个事实，即从表面增量发射的两个或多个偏振分量的商取决于表面倾斜角度，但几乎与表面温度无关(Weberpals等人，2011年)。基于激光焊接测量原理的应用结果，开发了一种适用于电子束焊接的测量方法，以评估大深度毛细管的可观测性，并为随后改进毛细管模型做出贡献。为了使改进的测量系统能够以无与伦比的空间和时间分辨率捕获电子束焊接过程中的毛细管，开发了一种全新的光学观察光束路径，并与电子束焊机内的定制加压腔相吻合。
Both typical beam welding processes laser beam welding LBW and electron beam welding EBW feature the deep penetration welding process. Theses processes rely on a vapor capillary with a delicate, highly dynamic equilibrium of various opposing forces. The direct observation of the vapor capillary's inner surface is hindered with growing capillary depth by the thermal optical emissions with high intensities due to the high temperatures inside the capillary. Even with the use of high intensity laser based illumination and band pass filters adjusted for the laser wavelength, it is merely possible to observe only the upper most part of the capillaries opening. The lack of observability, especially with high temporal resolution to assess the highly dynamic effects contributes to the state of the capillary models that actually are describing quasi-static modes or implement the less dynamic effects that can be observed with state of the art methods.The topographical measurement system, developed by the Institut für Strahlwerkzeuge Universität Stuttgart IFSW, uses the process inherent thermal emission of the capillary governed by the complex refractive index of the base material to reconstruct the inner geometry of the visible capillary surface. This is achieved by using the dependence of the emissivity between emission angle and polarization that is described by the Fresnel equations (Sawannia et al., 2018). The measurement system uses the fact that the quotient of two or more polarization components of the emission from a surface increment is depending on the angle of surface inclination but are almost independent of the surface temperature (Weberpals et al., 2011). Based on the results of the application of the measurement principle with laser beam welding, an adaption to electron beam welding is developed to assess the observability of capillaries with large depth and to contribute in the improvement of capillary models in the wake of the development. To allow the use of the improved measurement system to capture the EBW process capillary with unmatched spatial and temporal resolution, a complete new optical observation beam path was developed and fitted insight a custom-made pressurized chamber inside an electron beam welding machine.
电子束焊接腔中的热效应和动态效应
DOI：
--
发表时间：
1977
期刊：
影响因子：
--
作者：
D. Schauer
通讯作者：
D. Schauer
DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
J. Weberpals;T. Hermann;P. Berger;H. Singpiel
通讯作者：
H. Singpiel
用于基于激光的过程的空间分辨形貌测量的新型监测系统
DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
J. Weberpals;P. Berger;T. Graf;J. Trein;H. Singpiel
通讯作者：
H. Singpiel