Investigation of the formation mechanisms of the bonding zone in impact welding

爆炸焊和电磁脉冲焊特别适合于异种金属之间产生冶金接头，因为可以达到很高的接头强度。缺点是，由于可达性有限和加工速度快，对过程中连接区域内的相关机制仍然没有充分的研究和很好的理解。然而，为了能够有目的地设计关节，特别了解这些机构是非常有趣的。目前，实际的键合过程仍然是一个黑盒子，只知道输入变量（如材料属性）和结果属性（如键合强度），而不知道连接机制。直接的影响是，在工业应用中，关节必须或多或少地根据经验进行设计。其后果可能是潜力仍未得到开发。因此，这个项目的目的是通过仔细改变过程和输入参数，结合高空间和时间调查，也在原地填补这一空白。这是通过检验特定的假设来完成的。研究的主要对象是PtU的一个特殊试验台，该试验台能够结合定义明确、恒定的过程参数和良好的可观测性。另外结合高速成像可以获得新的见解。在研究项目中，有针对性地调整材料、涂层和周围介质，研究其影响。实验工作得到数值模拟的支持，可以更深入地了解这一过程。该项目将与优先计划内的其他研究小组密切合作，利用现有的实验和分析资源。

Explosion welding and electromagnetic pulse welding are particularly suitable to generate metallurgical joints between dissimilar metals, because high joint strengths can be achieved. As a disadvantage, the relevant mechanisms within the joining area during the process are still not sufficiently investigated and well understood due to the limited accessibility and the high process velocities. However, knowing particularly these mechanisms is of great interest in order to be able to design joints purposefully. Currently, the actual bonding process is still a black box, where only input variables (such as the material properties) and resultant properties (such as the strength of the bond) are known, but not the linking mechanisms. The direct effect is that joints in the industrial application have to be designed empirically with more or less effort. A consequence may be that potentials remain untapped.Consequently, the aim of this project is to fill this gap by a careful variation of process and input parameters in combination with high spatial and temporal investigations, also in situ. This is done by examining specific hypotheses. The main subject of investigation is a special test stand at PtU, which is capable of combining well-defined, constant process parameters and good observability. New insights can be gained in additionally combining high speed imaging. During the research project, material, coating and surrounding medium are to be purposefully adjusted to study the effects. The experimental works are supported by numerical simulations which allow even deeper insights into the process.The project will be run in close cooperation with other research groups within the priority program to utilize the available experimental and analytical resources.