本文提出了测试和评定小功率GTAW电弧稳定性新方法。在此方法中,采用X—Y函数仪监测电弧电压的动态波形,根据动态波形对电弧稳定性进行比较和评定。本文以此方法为依据,就电弧电流、电流脉冲频率、电极几何尺寸、保护气体等对电弧稳定性的影响进行了试验,提出了延长电极工作寿命和提高电弧稳定性的技术措施。本文研究成果已用于工业生产,提高了超薄不锈钢制品焊缝合格率及生产率。 This paper presents a new method to test and evaluate the stability of low-power GTAW arc. In this method, the dynamic waveform of arc voltage is monitored by X-Y function instrument, and the arc stability is compared and evaluated according to the dynamic waveform. Based on this method, the influences of arc current, current pulse frequency, electrode geometry and shielding gas on the stability of the arc were tested. The technical measures to extend the working life of the electrode and improve the stability of the arc were proposed. The research results of this paper have been used in industrial production, improving the weld pass rate and productivity of ultra-thin stainless steel products.