Currently used approaches for modeling the cathodic heat input in gas metal arc welding (GMAW) process simulation are usually based on very simplified approaches, either using a Rykalin-Rosenthal-distributed heat flux or a thermal conductivity approach, which do not reflect the deep physical processes involved. In this paper, a new approach for the calculation of the arc-cathode coupling in GMAW is presented, and the influence of the parameter variation on the formation of the weld pool is studied. The evaporation-determined model for arc-cathode coupling (EDACC) takes into account the recent findings on the plasma temperature in the GMAW arc, which is dominated by metal vapor, as well as the metal evaporation, which is readily ionized in the cathode region. It determines a relationship between the weld pool surface temperature and the heat flux as well as the current density distribution. As a result, the heat flux as well as the current density distribution is not axisymmetric. In this work, the model was coupled to a simplified weld pool simulation, and the influence of the model parameters like distribution of plasma temperature and welding velocity were investigated. Additionally, also the influence of the droplets on the weld pool surface temperature distribution and its effect on the arc-cathode attachment, as determined by the model, were studied.

中文翻译：

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电弧阴极耦合蒸发模型对GMAW过程模拟中熔池形成的影响

当前使用的气体金属电弧焊（GMAW）工艺模拟中阴极热输入建模方法通常基于非常简化的方法，要么使用Rykalin-Rosenthal分布的热通量，要么采用热导率方法，这些方法无法反映深层的物理现象。涉及的过程。本文提出了一种新的GMAW电弧阴极耦合计算方法，并研究了参数变化对焊缝形成的影响。电弧-阴极耦合的蒸发确定模型（EDACC）考虑了最近在GMAW电弧中等离子温度（由金属蒸气控制）以及易于在阴极区域电离的金属蒸发中的发现。 。它确定焊池表面温度和热通量之间的关系以及电流密度分布。结果，热通量以及电流密度分布不​​是轴对称的。在这项工作中，将模型与简化的焊接池模拟耦合，并研究了模型参数对等离子温度分布和焊接速度的影响。此外，还研究了熔滴对熔池表面温度分布的影响及其对电弧阴极附着的影响，如模型所确定的那样。并研究了模型参数对等离子温度分布和焊接速度的影响。此外，还研究了熔滴对熔池表面温度分布的影响及其对电弧阴极附着的影响，如模型所确定的那样。并研究了模型参数对等离子温度分布和焊接速度的影响。此外，还研究了熔滴对熔池表面温度分布的影响及其对电弧阴极附着的影响，如模型所确定的那样。