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Study of the current path in gas metal arc welding for the generation of a dynamic phenomenological system model

研究熔化极气体保护焊中的电流路径，以生成动态唯象系统模型

基本信息

批准号：
244987803
负责人：
Professor Dr.-Ing. Uwe Reisgen
金额：
--
依托单位：
Institut für Schweißtechnik und Fügetechnik (ISF)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/244987803?language=en
关键词：
Study current path gas metal

项目摘要

The regulation of the arc length in gas metal arc welding is an important part of control concepts in many welding power sources to adjust a stable welding process. Up to now, estimations and statistical values from the current-voltage characteristics are used as input for the arc length determination. Here, often for simplicity a one-dimensional arc model is assumed where mainly the arc column length can be vary whereas variations in the arc sheath regions, wire electrode and contact tube are neglected. However, in particular the arc sheath regions must be expected to contribute considerably to the power input and to cause additional voltage fluctuations. Therefore, the detailed experimental study of the current path from the contact tube over wire, droplet, arc including sheathes up to the work piece is aimed in the research project. The different parts of this path should be analysed separately by specific experimental techniques as well as by determining and using the different time scales of the underlying physical mechanisms. In particular, the study of the whole path by time series of electrical signals and measuring the complex impedance should be coupled with optical and spectroscopic investigations of the arc and probe measurements at the droplet depot. A description of the current path in form of a process model will be available as a result of the basic study which describes the dynamic and interdependent behaviour of the subsystems. Herewith the prerequisites for a considerable improvement of the arc length control in gas metal arc welding processes in contrast to existing solutions will be provided. In addition, the results can be used in following studies to improve the physical models of arc attachment and sheath regions at melted electrodes under the impact of metal evaporation.

在气体保护金属极电弧焊中，电弧长度的调节是许多焊接电源中调节稳定焊接过程的控制概念的重要部分。到目前为止，来自电流-电压特性的估计值和统计值被用作电弧长度确定的输入。这里，为了简单起见，通常假设一维电弧模型，其中主要是弧柱长度可以变化，而忽略电弧护套区域、线电极和接触管中的变化。然而，特别地，必须预期电弧鞘区域对功率输入有相当大的贡献并且引起附加的电压波动。因此，本课题的研究目标是对从导电管经过焊丝、熔滴、电弧（包括护套）到工件的电流路径进行详细的实验研究。这一路径的不同部分应通过具体的实验技术以及通过确定和使用基本物理机制的不同时间尺度分别进行分析。特别是，整个路径的电信号的时间序列和测量的复阻抗的研究，应结合光学和光谱的电弧和探针测量的研究在液滴库。作为描述子系统动态和相互依赖行为的基本研究的结果，将以过程模型的形式描述电流路径。因此，与现有解决方案相比，将提供气体保护金属极电弧焊工艺中电弧长度控制的显著改进的先决条件。此外，研究结果可用于后续研究，以改善在金属蒸发的影响下熔化电极的电弧附着和鞘区的物理模型。