But, when oxy-cutting or welding, oxygen aggressively amplifies the flame heat. It can oxidize the weld pool and tarnish weld quality. That’s because oxygen is highly reactive. Oxygen (O 2 ) – Oxygen is sometimes used in a mixture with argon as a shielding gas for welding stainless steel, but oxygen content must be less than 9%.But, if argon isn’t present in the mixture, you will experience more spatter and erratic arc behavior. Often, hobbyists use a pure CO 2 shielding gas for MIG welding mild steel because it’s inexpensive. The higher the CO 2 content, the deeper the penetration. Similar to helium, CO 2 improves penetration when MIG welding. The most common mixture is 75% Ar and 25% CO 2. However, if blended with argon, CO 2 does a great job stabilizing the arc when MIG welding mild steel. Carbon dioxide (CO 2 ) – CO 2 is a reactive gas, and you cannot use it to TIG weld.So, helium is often used to maximize the metal thicknesses you can work with on your TIG welder. The higher the helium content, the deeper the penetration. Helium (He) – Like argon, helium is an inert gas most often used in an argon/helium mixture.But, if you wish to MIG weld aluminum, it’s necessary to use a 100% Ar shielding gas.
Argon (Ar) – Argon is an inert shielding gas primarily used with TIG welding.Before proceeding to gas tank sizes and the different methods of acquiring a gas bottle, let’s quickly recap some of the most common welding gasses you may need.
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