Analysis of Physical Phenomena in Electrode Region of Arc Plasma

电弧等离子体电极区物理现象分析

• 批准号: 10305058
• 负责人: USHIO Masao
• 金额: $ 16.96万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10305058/
• 关键词: Plasma; Arc; Anode; Plasma diagnosis; Laser scattering; Weld pool; Metal vapor; Welding; 対流; アーク放電; 蒸発; 境界層; 陽極降下; LTE

In order to clarify electrode phenomena in the materials processing with arc plasma, the plasma diagnosis of gas tungsten arc (GTA) during welding was carried out by using a planar laser induced fluorescence (PLIF) analysis and a spectroscopic analysis.Change in distributions of metal vapor from the anode, namely, the weld pool to the arc plasma strongly affects the anode arc root owing to drastic change in electrical conductivity in the plasma. The difference between a diffuse mode and a constricted mode in the anode arc roots gives different forces such as the drag force of arc plasma, the electromagnetic force, etc.to the weld pool. These different forces would also lead to different vector of a fluid flow velocity in the weld pool, and then the penetration geometry of the weld should be changed.Experimental and theoretical results in the present research project give new knowledge of the interaction between the arc plasma and the electrodes to the materials processing with arc plasma, and also suggest a future direction of this research work.

为了阐明电弧等离子体材料加工中的电极现象，利用平面激光诱导荧光（PLIF）分析和光谱分析对焊接过程中的气体钨极电弧（GTA）进行等离子体诊断。阳极金属蒸气分布的变化，即焊接熔池到电弧等离子体的变化强烈影响阳极弧根，因为 等离子体中电导率的急剧变化。阳极电弧根部的扩散模式和收缩模式的差异给熔池带来了不同的力，如电弧等离子体的曳力、电磁力等。这些不同的力也会导致熔池中流体流速的矢量不同，从而改变焊缝的熔深几何形状。本研究项目的实验和理论结果为电弧等离子体材料加工提供了关于电弧等离子体和电极之间相互作用的新知识，也提出了这项研究工作的未来方向。

项目成果

田中学: "ティグアークプラズマの陽極領域解明の試み"溶接技術. 48. 67-71 (2000)

Manabu Tanaka：“尝试阐明 TIG 电弧等离子体的阳极区域”《焊接技术》48. 67-71 (2000)。

Manabu Tanaka: "Plasma state of boundary layer in TIG arcs"Welding Technique. 48. 67-71 (2000)

Manabu Tanaka：“TIG弧中边界层的等离子状态”焊接技术。