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: 264255196
• 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: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/264255196?language=en
• 关键词: Studies; reproducibility; magnetic; pulse; welding

The main objective of the project is to increase the reproducibility of the MPW. The influence of surface pretreatment on the reproducibility and to the formation of the lower curve of the weld area is clear from the state of the art and our own preliminary work. Our experiments show the strong influence of interfering contours perpendicular to the weld direction.To use MPW reproducibly, the lower curve of the welding window for MPW must be predictable. For this purpose, the surface must be incorporated into the calculation of the lower welding curve. The welding lower curve has to be supplemented with a factor for the surface. In the proposed project, especially the roughness and its orientation with respect to the welding direction are considered as a surface effect. More surface influences that are investigated in the SPP 1640 project A5 (Darmstadt), should also be considered and integrated. The collision speed required for the shock pressure will be used at the one side from the simulation results of the project A5 and at the other side from the experimental setup with the Plexiglas target and the high-speed PSD sensor.Due to the different pre-treatments it could be shown that a smoother target surface guides to an early beginning of the welding zone and a rough surface guides to a wide welding zone.For the explanation of this effect, the working hypothesis is that "thin" jet is sufficiently a smoother surface at the beginning of the weld produced during the small collision angle , to clean a smooth surface and to initiate the welding process. At the end of the welding process when the collision angle is so large that the welding window is left after above, a perpendicular roughness reduce the collision angle locally and the welding process is prolonged.Thus, a further aim of the project is increase the roughness of the surface by a gradient so, that the welding process starts with a smooth surface and ends at a rough surface. The welds will be more reproducible and the weld length will be constant high.To achieve the objectives, a close cooperation is planned with both the A5 project from Darmstadt ( PTU) as well as with the project A8 from Chemnitz ( IWW) .

该项目的主要目的是增加MPW的可重复性。从最新的状态和我们自己的初步工作中可以清楚地清楚地表面预处理对焊接区域下曲线的可重复性和形成的影响。我们的实验表明，干扰垂直于焊接方向的轮廓的强烈影响。要重复使用MPW，必须可预测焊接窗口的较低曲线。为此，必须将表面纳入下部焊接曲线的计算中。焊接较低曲线必须补充表面的因子。在拟议的项目中，尤其是粗糙度及其相对于焊接方向的方向被认为是表面效应。还应考虑并集成在SPP 1640项目A5（DARMSTADT）中研究的更多表面影响。电击压力所需的碰撞速度将在项目A5的仿真结果以及从实验设置的另一侧使用带有Plexiglas目标的另一侧使用，而高速PSD传感器则使用。可以证明，一个更平滑的目标表面向导到焊接区域的早期开始，而粗糙的表面向导向宽焊接区域进行了粗糙的表面指南。为了解释这种效果，工作假设是“薄”喷气机足够更顺利在小碰撞角度产生的焊缝开头的表面，以清洁光滑的表面并启动焊接过程。在焊接过程结束时，当碰撞角度如此之大，以至于焊接窗口之后留下，垂直粗糙度降低了局部碰撞角度，焊接过程延长了。通过梯度的表面，焊接过程以光滑的表面开始，并在粗糙的表面结束。焊缝将更可重现，并且焊缝长度将保持恒定。为了实现目标，计划与Darmstadt（PTU）的A5项目以及Chemnitz（IWW）的A8项目进行密切合作。