中文摘要：

提出一种脉动式保护气体TIG焊工艺。介绍脉动送气系统的构成与控制功能,观测了脉动送气的电弧现象和气流变化。采用氩-氦气体的交替切换,无论在直流还是脉冲电流的条件下,均具有控制电弧能量的变化,促进熔池运动,能达到一种能量脉冲的工艺效果。

英文摘要：

A pulse shielding gas TIG welding technology is put forward in this article. The constitution and control function of pulse gas supply system are introduced, and the arc phenomenon and airflow changes of the pulse gas supply are observed. No matter under the condition of direct current or pulse current, using alternating argon-helium gas switch can control the change of arc energy, promote the movement of molten pool and achieve a process effect of ＂energy pulse＂.