Argon's applications are quite extensive, and it is present in our daily lives. Due to its inert chemical properties and poor thermal conductivity, it is commonly used as a filling gas in lighting technology. Filling light bulbs with argon can extend the lifespan of the filament. Additionally, when energized, argon emits blue-violet light, so it is often mixed with other colored gases to fill bulbs for the production of neon signs.
In addition to lighting fixtures, some window glasses are also filled with argon. The windows of certain buildings feature double-glazing, with an insulating gas layer inserted between the glass panes. This layer is filled with argon, which helps to block some external heat, significantly reducing the thermal conductivity of the windows. This method is now widely used in the manufacturing of the hollow layer material for double-glazing.
In industrial production, argon is often used as a protective gas in metal welding or cutting: Firstly, during the welding process, due to its low thermal capacity and thermal conductivity, the heat loss of the arc in argon is minimal. In an argon environment, the arc cools down slowly, leading to better stability of the arc combustion, which can be maintained at a high level, enabling excellent welding performance.
Due to its relatively low ionization potential, argon requires a lower arc voltage for welding. This allows us to weld equivalent parts with less energy, thereby saving energy. Furthermore, argon has a higher density, about 1.4 times that of air. Once emitted from the nozzle, it forms a stable gas layer. Combined with its greater density than air, it is less likely to be dispersed, thus providing a stable cover over the metal surface, offering excellent protection.
