Studies on the reproducibility of the magnetic pulse welding in the case of an asymmetric impact

不对称冲击情况下磁脉冲焊接再现性研究

• 批准号: 323203464
• 负责人: Professor Dr.-Ing. Stefan Böhm
• 金额: --
• 依托单位: Fachgebiet für Trennende und Fügende Fertigungsverfahren
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/323203464?language=en
• 关键词: Studies; reproducibility; magnetic; pulse; welding

The aim of this research subject is to ensure the robustness and design of the properties of the welded joint for magnetic pulse welding. Here, research is based partly on physical process variables which had already been determined for impact welding (e.g. collision angle and collision point velocity) and the description of the lower weld seam boundary. According to the latest state of the art and own research, specific changes in the surface topography enable an enlargement of the welding window and allow to set the properties of the joint. Furthermore, the research has shown that, in conjunction with certain process parameters (e.g. influence of the acceleration distance on the collision angle as well as the regulation of the current), the jet formation can be influenced, which, in turn, effects the morphology of the welded joint (wavy or flat interface, phase formation). This research project also aims to determine and secure the mechanical properties of magnetic pulse welds (cyclical and dynamic load) with regard to the morphology of the weld and wants to examine the influence of high process velocities on hardening in the welding zone after plastic deformation. In order to evaluate the quality of the weld seam, the surface of the weld seam will be established as a quality feature for magnetic pulse welds and will then be correlated to the physical process variables. Another important focus will be the determination of the energy balance so that the results can be transferred to other material combinations. Depending on the topic, tests will be performed in cooperation with the project A5 (PTU, collision welding) as well as A8 (IWW, microstructural mechanisms). In addition, there will also be a cooperation with the project A3 (MPIE, surface chemistry) and, finally, the influence of the oxide layer will be examined.The acquired results will enable a product design suitable for welding with a layout of the properties of the welded joint which is flexible, in order to suit specific applications. Additionally, in cooperation with the project A5, these results shall support the prediction of the properties of the joint via numeric simulations.

该研究对象的目的是确保焊接接头的鲁棒性和设计用于磁性脉冲焊接。在这里，研究部分基于物理过程变量，这些变量已确定为撞击焊接（例如碰撞角度和碰撞点速度）和下焊缝边界的描述。根据最新的艺术状态和自己的研究，表面地形的特定变化使焊接窗口扩大，并允许设置关节的性质。此外，研究表明，与某些过程参数结合在一起（例如，加速度距离对碰撞角度以及电流的调节的影响），可以影响射流形成，从而影响形态，从而影响形态焊接接头（波浪形或平面界面，相形）。该研究项目还旨在确定并确定磁脉冲焊缝（周期性和动态载荷）在焊缝的形态方面的机械性能，并希望检查塑性变形后高过程速度对焊接区域硬化区域的影响。为了评估焊缝的质量，将建立焊缝的表面作为磁脉冲焊缝的质量特征，然后将其与物理过程变量相关。另一个重要的重点是确定能量平衡，以便可以将结果传递到其他材料组合。根据主题的不同，将与项目A5（PTU，碰撞焊接）以及A8（IWW，微结构机制）合作进行测试。此外，还将与项目A3（MPIE，表面化学）进行合作，最后将检查氧化物层的影响。获得的结果将实现适合焊接的产品设计为了适合特定应用的焊接接头的焊接关节。此外，与项目A5合作，这些结果应通过数字模拟来支持关节性质的预测。