What Gas is used for Tig Welding

Tungsten Inert Gas (TIG) welding is a process that uses a non-consumable tungsten electrode to make the weld. The tungsten electrode is used to heat the surface of the metal being welded, and then the copper filler rod is applied to the heated area. TIG welders use different types of gas depending on what type of metal they are working with and what kind of job they are doing.

What gas is used for tig welding

The four most common gases used for tig welding are argon, helium, carbon dioxide, and nitrogen.

  • Argon is used for welding aluminum and magnesium. Argon gas is not radioactive and has no odor while it’s being used.
  • Helium is used primarily for welding stainless steel but can also be used to weld other metals, such as copper or brass if you want a more accurate bead shape than you’d get with argon-based tungsten electrodes (tungsten rods). The reason why helium works better on stainless steel than argon does have something to do with atomic weight–but don’t worry about that! Just know that it does work well if you’re looking for a bright white joint line coloration during your welds.*

Carbon dioxide is typically considered an inert gas because it doesn’t react chemically with anything around it; however, some people still prefer using CO2 over other types of shielding gases because they feel like they get better results using this particular type of shielding gas compared with others available on the market today.*

Nitrogen protects against oxidation but can also cause arc instability if a low flow rate is used.* Oxygen causes oxidation during high temperatures, which leads to cracking along seam lines–so avoid using this combination unless necessary!

Types of Gas

The most common types of gas used for TIG welding are argon, helium, and carbon dioxide. Argon is the most commonly used gas for TIG welding because it produces a stable arc and good bead formation. Helium also delivers an authoritarian turn but does not have as much thermal conductivity as argon, so it can take longer to heat an area you’re working on.

Carbon dioxide is another popular choice because it’s inexpensive and doesn’t produce harmful fumes when burned off in your machine’s torch tip or cooling water system. Nitrogen is another option that many people choose over argon because its lower cost makes it more affordable for hobbyists who want to dabble in this hobby without spending too much money upfront. However, nitrogen has less thermal conductivity than helium or carbon dioxide, so keep this in mind when choosing which type works best for your needs!

Finally, oxygen can be used instead of air if you want added protection against oxidation while welding – however, make sure not too much O2 gets into contact with any part other than what you’re currently working on since otherwise, there could be severe consequences (like fire!).


This is the most popular gas for tig welding because it can weld steel, stainless steel, and aluminum. The argon is excellent for beginners because it’s easy to use and requires no special equipment beyond what you already have (a tungsten electrode). Argon has a low heat input that makes it ideal for thin materials like sheet metal or thin-gauge materials like pipe.

Argon is also relatively inexpensive compared with other gases such as helium or carbon dioxide (CO2). However, plan on working with thicker metals more often than not. CO2 may be better suited for your needs since argon will not penetrate deep into thick metal sections very well without significantly increasing its flow rate through the torch tip–which can cause overheating issues with your electrodes during extended welding sessions.


Helium is used for tig welding aluminum, magnesium, and copper. It’s also used for tig welding silver, gold, and other precious metals.

Helium has a higher thermal conductivity than argon or hydrogen (which means it conducts heat better), so it can be used with high-frequency inverters to weld smaller parts more quickly. This makes helium ideal for TIG torches with an inner diameter of 1/8 inch or less.[1]

Carbon Dioxide

Carbon dioxide is used for welding steel and aluminum and is not as expensive as argon. It has a higher thermal conductivity than argon, which means your welds will melt faster than those made with other gases. However, carbon dioxide is not as inert as argon; it can cause more spatter when used with TIG welding techniques.


Nitrogen is used for welding stainless steel, aluminum, and titanium. It’s also the gas of choice for copper, nickel, and other materials.

Suppose you’re looking to weld with nitrogen. In that case, you should know that it requires a special torch that has a narrow flame tip–this allows you to direct heat exactly where you want it without damaging surrounding areas by overheating them or burning them with excess oxygen in the air around your workpiece (which can cause corrosion).


Oxygen is the most reactive and has the most energy. Because of this, it’s ideal for tig welding. Oxygen is used because it’s the most reactive and powerful. See also 8 Best Portable MIG Welders in 2022, 7 Best Cheap Multi Process Welders in 2022

The gas used for tig welding differs based on the type and the metal being welded.

  • Argon is used for aluminum.
  • Helium is used for stainless steel and cast iron (not in the same tank).
  • Carbon dioxide (CO2) is used for low-alloy steels. Nitrogen can be added to it, which adds flexibility and allows you to use a smaller size nozzle on your torch while still getting good penetration into thicker materials like plate steel or cast iron plates with nozzles that are rated at 3/32″ diameter or larger, but only if you want a faster arc speed than what CO2 alone would provide without any other gases being added into your tank first!


A gas is a substance that burns without producing carbon dioxide, or CO2. It creates heat to weld metals together or melts them into liquid form so they can be pumped through pipes or gas tanks. Gas may also have other uses, such as solidifying and sterilizing water, food, and medicine, but these are not related directly to welding processes.

Note: ElectroWeld is reader-supported. If you click a link and buy something we may receive a small commission at no extra cost to you., learn more on disclaimer.

Leave a Comment