Magnetic pulse welding: Targeted manipulation of weld seam formation

磁脉冲焊接(MPW)是一种允许由于高速变形和碰撞而连接不同材料的技术。在优先项目1640的前两个资助期，研究了长焊缝生产的连接机制和关键参数。在此基础上，第三期合作研究项目的重点是有针对性地强化加入机制。此外，还将开发和测试用于过程控制和焊接质量预测的测量仪器。磁压持续时间被确定为主要参数之一。研究了不同压力-时间曲线对飞片成形行为的影响。因此，TU Dortmund大学成形技术与轻量化构造研究所(IUL)和TU Dresden大学制造技术研究所(IF)之间的成功合作是有意继续的。这种星座提供了优势，因为两个研究所都拥有互补的脉冲发生器，用于产生高频和低频的放电脉冲。在与弗劳恩霍夫研究所的合作支持下，两个研究所的互补专业知识，通过IUL形成和连接技术，通过IF连接技术和微观结构，确保了项目程序的成功。在第二阶段，发现了厚层和韧性涂层对接头形成的积极作用。下一阶段的目标是确定导致这种现象的材料属性，例如涂层的减振行为。因此，与A4小组已建立的合作将得到延长。此外，结果将被转移，以实现具有脆性涂层的部件之间的焊接或添加制造的样品。在与A2小组合作期间，将研究利用超声波技术对MPW接缝进行非接触表征。此外，对飞片变形的光学测量将被用作在线监测。项目建成后，将为进一步接近工业用户要求的工艺调整奠定基础。

Magnetic Pulse Welding (MPW) is a technology that allows for joining dissimilar materials due to high speed deformation and collision. In the first two funding periods of the priority program 1640, the joining mechanism and the key parameters for the production of long weld seams were investigated. On this basis, the focus in the third period of the collaborative research project is on the targeted intensification of the joining mechanism. Furthermore, measurement instruments for process control and prediction of the weld quality will be developed and tested. The duration of the magnetic pressure was identified as one of the major parameters. The influence of different pressure versus time plots on the forming behavior of the flyer will be studied. Therefore, the continuation of the successful cooperation between the Institute of Forming Technology and Lightweight Construction (IUL) at TU Dortmund university and the Institute of Manufacturing Technology (IF) at TU Dresden university is intended. This constellation offers advantages, since both institutes possess complementary pulse generators for the creation of discharging pulses with high and low frequencies. The complementary expertise of both institutes, forming and joining technology by IUL and joining technology and microstructure by IF, guarantee the success within the project procedure, supported by the cooperation with Fraunhofer IWS. The positive effect of thick and ductile coatings on the joint formation was discovered during the second period. The objective for the next period is to identify the material properties that are responsible for this phenomenon, e.g. the damping behavior of the coatings. Therefore, the established cooperation with the subgroup A4 will be extended. Additionally, the results will be transferred to achieve welding between parts with brittle coatings or additively manufactured samples. The contactless characterization of MPW seams through ultrasonic technology will be studied during the cooperation with the subgroup A2. Furthermore, the optical measurement of the flyer deformation will be used as an inline-process monitoring. After completion of the project, the basis for the further process adjustment close to the requirements of industrial users will be laid.