From Tungsten Electrodes to Arc Stability Impact Factor – Shielding Gas Effect

By GTAW arc stability test under high pressure environment, you can know that many factors can affect the arc stability of tungsten electrodes, including the effect of shielding gas, the tungsten electrode and the workpiece surface condition and other factors. This article is mainly about the effect of shielding gas effect on arc stability.

Shielding gas effect will affect the stability of the arc. Under certain conditions, the gas flow rate and nozzle diameter has an optimum range, shielding gas effect is best at this time, and the effective protection area is also the largest on the weldment. If the gas flow is too low, the air flow exclude the ambient air is weak, so that shielding gas effect will be relatively poor; if the gas flow is too fast, it is easy to form turbulence and involve air when gas exhaust, thereby reducing protection effect. When the gas flow rate is constant, if the nozzle diameter is too small, the protected area is relatively small, and it will lead to the formation of turbulence because of the high air velocity;

 if the nozzle diameter is too large, it will not only hinder observation, and will lead to a too low flow rate, that is to say, the protective effect is not very good. In addition, this test is carried out under high pressure environment, it also needs to consider the environmental pressure (air) impact on the protective gas - argon, and measure can be taken: ensure that the ambient air pressure is less than the argon gas pressure.



 

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