Joining of intrinsically manufactured frp/metal components to metallic structural elements by resistance spot welding

通过电阻点焊将固有制造的玻璃钢/金属部件连接到金属结构元件

• 批准号: 418238897
• 负责人: Professor Dr.-Ing. Jürgen Fleischer
• 金额: --
• 依托单位: Institut für Produktionstechnik (WBK)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/418238897?language=en
• 关键词: Joining; intrinsically; manufactured; frp; metal

In the course of the ever-increasing demands of the environmental and climate protection pose to the transportation sector, lightweight construction is increasingly gaining in importance when it comes to developing future vehicles. The greatest lightweight potential is often found in composite construction where metal components are combined with fiber-reinforced plastic components. The thus resulting material mix is particularly demanding for joining methods. When joining conventional steel/steel connections in vehicle body construction, adhesive processes and component-penetrating supplementary elements, as for example screws and rivets, are primarily used or the fusibility of the components during welding is harnessed. Because of its high degree of automation and its achievable cycle times, resistance spot welding is still considered the preferred and most prominent joining technique in vehicle body construction. However, fiber reinforced plastics with a duroplastic matrix cannot be melted. Furthermore, a supplementary element which is subsequently introduced destroys the component’s fiber architecture, resulting in a reduction of the strength of the overall compound.A promising approach of making resistance spot welding compatible with FRP/metal components consists in intrinsically integrating weldable load-introducing elements into the fiber composite. In contrast to supplementary elements introduced subsequently, the so-called inserts may be integrated without damaging any fibers thereby allowing to exploit the full lightweight potential of the fiber structure.This project shall examine fundamental correlations between the manufacture of composite components, the accompanying fiber flow and the subsequent welding process in order to be able to install weldable inserts. A method shall be developed, using simulation models and the systematization of process and component design to facilitate the composition of the joining area under consideration of heat introduction during resistance spot welding.The planned investigations shall make a significant contribution to understanding the manufacturing process and the individual design of weldable FRP/metal compounds, in order to enable good mechanical properties of the joint as well as high reproducibility.

随着交通运输行业对环境和气候保护的要求不断提高，轻量化结构在未来车辆开发中的重要性日益凸显。最大的轻量化潜力通常是在复合材料结构中发现的，其中金属部件与纤维增强塑料部件相结合。由此产生的材料混合对连接方法的要求特别高。当在车身结构中连接传统的钢/钢连接时，主要使用粘合工艺和组件穿透辅助元件，例如螺钉和铆钉，或者利用焊接过程中组件的可熔性。由于其高度的自动化程度和可实现的周期时间，电阻点焊仍然被认为是汽车车身结构中首选和最突出的连接技术。然而，具有硬塑性基体的纤维增强塑料不能熔化。此外，随后引入的补充元素破坏了该组分的纤维结构，导致整体化合物强度的降低。使电阻点焊与FRP/金属构件兼容的一种有前途的方法是将可焊接的载荷引入元件本质上集成到纤维复合材料中。与随后引入的补充元件相比，所谓的插入元件可以在不损坏任何纤维的情况下集成，从而允许利用纤维结构的全部轻量化潜力。该项目应检查复合材料部件的制造、伴随的纤维流动和随后的焊接过程之间的基本相关性，以便能够安装可焊接的镶件。应开发一种方法，利用仿真模型和工艺和部件设计的系统化，在考虑电阻点焊过程中热引入的情况下，促进连接区域的组成。计划的调查应对了解可焊接FRP/金属复合材料的制造工艺和单独设计做出重大贡献，以使接头具有良好的机械性能和高再现性。