At present, the conventional SF6 leakage detection methods include soapy liquid leakage detection, local dressing method leakage detection, leakage detection by leakage detector, infrared imaging method leakage detection, etc.

Generally, helium is used as protective gas, which can suppress plasma to the greatest extent, thus increasing the depth of penetration and improving the welding speed; And light weight can escape, not easy to cause pores

The safety inspection before cylinder use is the core of cylinder use

Nitrogen is widely used in national economy and people's livelihood, which is closely related to human life, production activities and scientific experiments.