中文摘要：

为研究TIG电弧载流区形态及电流密度分布,采用一种阳极氧化处理的铝丝作为低扰动静电探针,沿铝丝长度方向运动进入电弧,并在电弧轴向不同高度截面内测定饱和离子电流及悬浮探针电位.结果表明：饱和离子电流分布宽度与载流区宽度相当,悬浮探针电位分布宽度则可代表包括外围负离子区的电弧宽度.电弧宽度和载流区宽度均沿电弧轴线由阳极向阴极减小.在载流区边缘,电流密度快速增加,而载流区内电流密度分布较均匀,在阳极附近电流密度最小,并沿电弧轴线向阴极增加.

英文摘要：

The TIG arc current-carrying region shape and current density distribution was analyzed by the low disturbance electrostatic probe which consisted of aluminum wire using anodic oxidation treatment,and the low disturbance electrostatic probe was moved along its longitudinal direction to enter the TIG arc.At the same time,both of the saturated ion current and floating potential in various sections along the axial direction of arc was measured by probe.The results showed that the saturated ion current width is equal to current-carrying region width,the arc width including peripheral anion can be represented by the width of floating potential.The arc width and the current-carrying region width are reductive along the arc axial direction from anode to cathode.The current density increase rapidly in the frontier of current-carrying region,and the current density distribution is uniform in current-carrying region.The current density is minimal near the anode,and it is enhancive to the cathode along arc axial direction.