CO2激光作用下直流TIG电弧特性分析

Characteristics of DC TIG arc with the action of a vertically incident CO2 laser beam

关键词:  钨极惰性气体保护焊  CO₂激光  电弧静特性  电弧形态  电弧功率

Key words:  tungsten inter-gas  CO₂ laser  static characteristic of arc  arc configuration  arc power

摘要:

文中借助高速摄像和激光功率计等先进手段,研究了CO₂激光与直流TIG电弧垂直相互作用时激光对电弧特性的影响.激光功率越高,电弧静特性曲线下移幅度越大,电弧电功率越低,而电弧总功率越高.电弧电流越小、激光作用位置越靠近阴极,电弧电压下降幅度越大.激光作用引起电弧体积膨胀主要发生在激光作用位置到阳极之间的区域.结果表明,激光作用电弧后,电弧静特性曲线下移,体积膨胀,电弧电功率下降,而总功率增加。

Abstract:

Technology, Beijing 100022, China). Laser-arc hybrid welding is one of the advanced joining techniques.By using instruments such as a high-speed camera and a laser power meter, the effects of a vertically incident CO₂ laser beam on characteristics of a DC tungsten inter-gas arc are investigated.Results demonstrate that the laser-arc interaction causes the curve of arc static characteristic to shift downwards, the arc column to expand, the electric power to decease and the total arc power increase.With the increase of the laser power, the downward shift of the static characteristic curve increases, but the total arc power increases.The lower the arc current is and the nearer the laser beam locates to the cathode, the more the arc voltage decreases, which the expansion of the arc column mainly occurs in the range between the laser beam location and the anode.