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.
oxygen and acetylene
farting gas:)
You answered your own question. Oxygen and Acetylene. Other mixes are now used in place of Acetylene so the process is now called Oxy-Fuel.
Oxy-Gasoline is an effective fuel and is very good when traditional gas bottles are not available. Hydrogen is a good fuel when welding aluminium but is not used when welding steel because it damages the steel. Propane, butane and butane/propane mixes are also used.
I would say that SMAW (stick) is still the most widely used process. The GMAW (mig) process has gained a wide acceptance in construction and fabrication and may even have surpassed stick welding in many situations. Unfortunately with mig welding the machine has to be close to the welding site. Dragging a welding lead into and around fabrications is still much easier than moving a mig machine.
oxygen and acetylene
Helium and argon are used as inert gases in welding.
Argon and Helium are used as sheilding gases in welding.
farting gas:)
Carbon dioxide, Argon, Helium, but not Nitrogen, can be used as 'shielding' gas in Gas Metal Arc Welding.
helium and argon
These inert gases are used in gas tungsten arc welding, and also in gas metal arc welding for the welding of non-ferrous metals. Semi-inert shielding gases, or activeshield gases, include carbon dioxide, oxygen, nitrogen, and hydrogen. These active gases are used with GMAW on ferrous metals.
There are a few commonly used welding process. The top used are shielded metal and arc welding.
filler materials are used to fill the gap between the two job materials during the welding process
TIG welding uses Argon.
Arc. It's where electrical resistance is used to create the heat for the welding process.
You answered your own question. Oxygen and Acetylene. Other mixes are now used in place of Acetylene so the process is now called Oxy-Fuel.