In this paper the weld pool is excited by pulsating welding current which is produced by superimposing a certain frequency sine wave current on the straight polarity DC current and the oscillating signals of weld pool can be detected through arc voltage signals in travelling TIG welding .

本文在 恒定直流之上叠加定频率正弦波电流做为脉冲焊接电流激振 熔池，在连续行走焊接时，通过电弧电压检测熔池振荡即熔 池 尺寸。