Influence of metal vapor on plasma arc stability

提高工艺效率目前是弧焊等热连接工艺科学研究的重点。在几年的时间里，对流程进行优化、修改和控制。许多研究集中在电弧与其边界条件之间的相互作用，例如额外的工艺或基础材料。到目前为止，蒸发金属的影响还不能脱离表面温度来观察。即使是衬底的预热也会对电弧产生影响。影响电弧的主要机制尚不能明确确定。在本研究项目中，研究了金属蒸气插入电弧形成和稳定的机理。在电弧的导电性取决于插入的金属蒸气的合金元素的假设下，将研究不同钢和铝合金的稳定电位。通过指定的设置，可以避免由于工件的表面升温而产生的效果。因此，金属蒸气是用来自隔离衬底的激光产生的，并垂直于电弧工艺插入。在蒸汽流入期间，将监测电弧电压的变化。通过额外的光谱分析，可以确定电弧中的电离元素。本项目的目的是识别和验证等离子弧焊的稳弧机理。此外，扩展的知识将被用于开发使用新的稳定机制的具有更高可靠性的高速工艺。

Increasing process efficiency is currently focused by scientific research of thermal joining processes like arc welding. For a couple of years processes are optimized, modified, and controlled. Many studies were focused on interaction between the arc and its boundary conditions e.g. additional processes or base materials. Up to now, effects of evaporated metal cannot be observed separately from the surface temperature. Even preheating of a substrate has an influence on the arc. The dominating mechanisms for influencing the arc cannot be identified definitely. In this research project mechanisms of arc formation and stabilization by metal vapor insertion are investigated. Stabilization potential of different steels and aluminum alloys will be investigated under the hypothesis that the conductivity of the arc depends on the alloying element of the inserted metal vapor. With the designated setup effects due to surface warming of the work piece can be avoided. Therefore, metal vapor is generated with a laser beam from an isolated substrate and inserted orthogonal to the arc process. Changes of the arc voltage will be monitored during this vapor inflow. With additional spectroscopic analysis an identification of ionized elements in the arc is possible.Aim of this project is to identify and to validate arc stabilizing mechanisms on plasma arc welding. Further, extended knowledge will be used for development of high speed processes with higher reliability using new stabilizing mechanisms.