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

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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.