It depends on what welding process is being used and what type of metal is being welded. When Oxy-Fuel Welding, Acetylene is the most popular. MAPP gas and Propane are also used. With the GMAW (MIG) process Argon, CO2 and Oxygen gasses, in mixtures or alone, are used. GTAW (TIG) gasses are almost always Argon and/or Helium. This is not all inclusive as new processes are being developed every day. Check with your welding material supplier for relevant info.
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Gas o vapor
Normally, acetylene, which is a colorless gas, C2 H2, that smells like ether
The gas that is used for welding is a pure hydrocarbon compound (C2H2).
Oxygen is used as active gas during MIG welding, spray transfer. It increases penetration and travel speeds. It is used only is small amounts though ususally 1%-5%. +++ The question mentioned "gas" welding, not any form of electric-arc process, and in oxy-acetylene and oxy-hydrogen welding the oxygen is necessary to raise the fuel-burning temperature to above the melting-point of steel.
What type of welding can we use LPG ?
When MIG welding STEEL a mixture of Argon -- CO2 is used. 75% - 25%
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Gas welding & Friction welding. Souvik Kumar Dey
oxygen and acetylene gas Argon gas is used in MIG and TIG welding
For welding 8 mm thickness metals, common methods include MIG (Metal Inert Gas) welding, TIG (Tungsten Inert Gas) welding, and stick welding (SMAW - Shielded Metal Arc Welding). The choice depends on the type of metal and specific requirements.
ER70S-6 is a very common filler metal when welding with Gas Metal Arc Welding or Gas Tungsten Arc Welding on a low carbon steel (mild steel). This can be purchased as a spool or in rod form.
for welding dingeberries
Some methods are used: - electron beam welding - laser beam welding - gas wolfram arc welding - gas metal arc welding - resistence welding - brazing
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why oxyacetylene filler rods cannot be used for gas tungusten ar welding
TIG welding uses Argon.