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oxygen and acetylene gas Argon gas is used in MIG and TIG welding
Oxygen and acetylene for flame welding. Argon for Tig welding CO2 for MIG welding steels Argon for MIG welding aluminum TRI-mix for robotic mig of steels. And helium is added for some overhead welding.
For example argon or helium for TIG welding. Oxi-fuel welding: oxygen and a combustible gas: acetylene, propane, butane, propylene, gasoline, hydrogen, etc.
Depends on what you think of as normal welding. Gas welding use oxygen-acetylene. MIG/TIG use Argon. MAG, use an argon-something mix. Depending on what materials you are welding, there are some more options tha might be used.
Gasses used in welding can include oxygen, acetylene, argon, helium, hydrogen, propane, MAPP gas, and others for special purposes. They may be grouped as oxidizers, fuels and shield gasses.
acetylene is a flammable gas and relies on oxygen to burn. Argon would prevent a flame by displacing oxygen because of it's density in comparison to oxygen.
Welding gas can refer to two things. In torch welding, it is either a fuel gas such as acetylene or MAPP or oxygen, and in arc welding (MIG, TIG, etc...) it refers to any of the inert gases such as carbon dioxide or argon that is pumped over the weld pool to protect it from atmospheric contaminants.
The gas is going to depend on what style of welding you are doing. For TIG (tungsten inert gas) it is 100% argon. For heliarc, which is a form of TIG, it is 100% helium. For MIG (metal inert gas) it is 75% argon/ 25% carbon dioxide. Finally, for gas welding, it acetylene and oxygen--separate tanks. (my son helped on this one)
Argon is used in welding to prevent oxygen from entering the weld site. Oxygen is basicly bad for the weld and Argon displaces the oxygen which results in a better weld (less heat stress, less air pockets (imperfections in the weld) etc.)
Argon is an inert gas- it does not react with any other gasses. While fuel gasses (acetylene) and oxygen must be separated during storage due to the fire hazard, there IS no fire hazard from an inert gas. It may be stored with fuel gasses or with oxygen.
Oxygen Nitrogen Argon Carbon Dioxide Propane Helium Hydrogen Acetylene
You can weld with acetylene, which burns very well; argon is inert and doesn't burn at all, so it is useless for welding.