TIG电弧弧柱机制的静电探针分析  

Analysis of arc-column mechanism of TIG arc with electrostatic probe

作　　者：朱亮[1,2] 田玉吉[2] 李渊博[2] 郑韶先[2] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050 [2]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2008年第5期14-18,共5页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(50775150)

摘　　要：利用自行研制的运动铜丝静电探针,对TIG电弧进行低扰动诊断,测量弧柱区不同位置的电位.结合静电探针与等离子体相互作用机理分析电位波形的形成机制.研究发现,当探针位于电弧的中央区域时,探针与载流等离子体和非载流等离子体发生交替接触,使探针上的电位呈负电位和零电位交替变化.据此提出摆动载流通道TIG电弧模型.在电极的阴极斑点和工件的阳极斑点之间,形成一种直径小于弧柱的载流通道,它以数百赫兹的频率,在电弧内部温度较高的等离子区旋转和摆动,承担所有的电弧电流.而在载流通道没有运动到的外围温度区域,则呈现温度较低的负离子区.A movable electrostatic probe of copper wire was developed for low-disturbing diagnosis of TIG arc. The potentials of the arc column in various probed positions were measured on the basis of the mechanism of interaction between electrostatic probe and plasma, the formation mechanism of probed potential waveform in plasma was analyzed. It was found by the investigation that, when the electrostatic probe located at the center area of the arc, the probe contacted alternately with the current carrying plasma and non-current-carrying plasma, thereby the potential on the probe changed between negative and zero levels. Thus, a model of oscillating current-carrying channel was presented for the TIG arc. A kind of current carrying channels with diameters less than those of arc column formed between the cathode spots and anode spots in the workpiece and they would rotate and oscillate with a frequency of hundreds hertz in the plasma region to form higher temperature and bear all the arc current. However, in the outer region where the current carrying channels did not reach, there would be a negative ion region with lower temperature.

关 键 词：静电探针 TIG电弧 载流通道 

分 类 号：TG444[金属学及工艺—焊接]