Co2 Welding Uses. But like any other welding gases it also has a bit of the disadvantage on MIG welding. This may seem like a simple answer but there are very good reasons for it.
CO2 is perhaps the most popular reactive gas used by MIG welding professionals due to its low cost deep penetration and the ability to be used without getting mixed with an inert gas. Thumbs up this video if it helped you. But like any other welding gases it also has a bit of the disadvantage on MIG welding.
Argon helps keep the weld environment completely inert and it helps to form a very stable controllable arc.
CO2 welding gas mostly used gas for MIG welding is used for shielding the arc and molten pool. So its more often used in a mix with something else than as pure CO 2. The second most common type of electrode holder is semiautomatic water-cooled where the only difference is that water takes the place of air. It causes oxidation especially around tungsten which is the electrode in a TIG welder.