Can you MIG weld mild steel with pure argon or 100% (pure argon)? | welding troop (2023)

MIG welding, or metal inert gas welding, has been the preferred welding method since its development during World War II. It was developed by factory workers to greatly increase production speed and maintain a uniform weld throughout the construction.

MIG welding is much faster and cheaper than other forms of welding, but it is also one of the easiest forms of welding to learn. As some people say, it's like using glue with a few extra steps.

Can you MIG weld mild steel with direct argon?Yes, you can use 100% argon to MIG weld steel, but this welding gas has many advantages and disadvantages. It is best to use a combination of MIG welding gases to get the best results for your specific project.

Argon is one of the four gases used in MIG welding. When deciding whether to use argon gas for MIG welding, you should consider the specific qualities of your project, such as metal thickness, required weld quality, and budget.

This article will discuss the pros and cons of argon MIG welding, as well as answer the question most people who are just starting out in the welding industry or have never heard of the MIG welding process: what is it MIG welding?


MIG welding with Argon 100

Argon is widely used as an inert gas in MIG welding, which means that it complements another gas.Argon offers the welder greater penetration, arc stability, and less spatter.

Argon is an inert gas, which means that it will not react with other materials without a substantial amount of energy being present.

The gas does not react with other materials or gases, making it the perfect gas to use in the shielding process.

Related reading: What gases do MIG welders use >> Welding Shielding Gas | complete guide

100 Argon for MIG can be used neat, but only as a last resort, as it leaves a very brittle and unsightly narrow, uneven weld bead.

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The reason behind this is that 100% argon does not have a high thermal conductivity, so the outside of the gas stream is much cooler than the center of the stream. This creates a small, narrow cavity in the metal that is prone to cracking and has a lot ofSneeze.

Can you MIG weld mild steel with pure argon or 100% (pure argon)? | welding troop (1)

The use of Argon 100 for MIG is acceptable to finish a project if you run out of gas, or as a last resort, but in the long term, the use of pure Argon for the MIG welding process is not recommended as it leads to a rougher weld. weak fragile and less attractive.

MIG Welding with Argon 100 >>Check thevideo the continuation

ME welding

sunny day IIt is widely considered to be one of the simplest forms of welding that is widely used in the welding industry today.It has gained popularity for its simplicity, economy, speed, and ability to be easily customized to fit the specifications of the project you are working on.

As for what MIG welding is, this is how the MIG welding process works:

“MIG welding is an arc welding process in which a continuous solid wire electrode is fed through a welding gun and into the weld pool, joining the two base materials.

Shielding gas is also delivered from the welding gun and protects the weld pool from contamination.”

Fuente:Miller Electric Mfg. LLC

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Unlike other forms of welding that MIG welding has, it offers a great advantage in that it continuously feeds the wire through the nozzle to allow continuous welding without the need to replace the wire.

You can think of it like a hot glue gun where you only have a certain amount of glue in the gun at any given time.

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If you replace the glue stick with a six meter long glue stick, you can use this glue gun for a long time.

Where MIG welding doesn't measure up to other forms of welding is that it struggles to make good welds when the steel is oxidized or not perfectly clean.

If you want the speed, quality, and efficiency that the MIG welding process offers, you need to make sure that the metal you plan to weld is clean.

The best way to do this is to use a nail file or metal brush to remove any contaminants from the metal before welding.

Related reading: How much do MIG welders make? Average MIG Welder Salary

MIG Welding Fumes

The MIG welding process is based on the use ofshielding gasesto ensure that the weld puddle does not come into contact with gases in the atmosphere.

The shielding gases also direct the arc and wire to a location that minimizes spatter. When choosing which gas or combination of gases to use on your MIG welding project, you should consider:

  • gasoline cost
  • Finished Weld Properties
  • Preparation
  • post weld cleaning
  • material basis
  • solder transfer process
  • Productivity

You are in full control of all these aspects of the welding process when you use MIG welding.

Can you MIG weld mild steel with pure argon or 100% (pure argon)? | welding troop (2)

The four gases used in MIG welding are:

  • argon
  • Helio
  • Carbon dioxide
  • Oxygen

Each of these gases has specific qualities that offer many benefits and drawbacks when using them for the MIG welding process.Most commonly, a combination of two of these gases is used in the process.

Related reading: How To Use A Gasless MIG Welder | Is gasless MIG welding good?

Carbon dioxide

Carbon dioxide is the most common of these gases used in MIG welding.It is also the only one that can be used effectively and is commonly used in its pure form.

Carbon dioxide is also the least expensive of these gases, making it more attractive to use over the other gases.

Pure carbon dioxide provides deep penetration when welding, which is perfect for thicker metals, but has more spatter and a less stable arc when not mixed with other gases.

For those who emphasize weld quality, a combination of carbon dioxide and argon should be used for best results.Most consider a mixture of 75 to 95% argon and the rest is pure carbon dioxide.

This combination provides a unique combination of arc stability, puddle control, and less spatter than if you were using carbon dioxide alone.

You can also perform a spray transfer which will lead to higher production rates and a higher quality weld.


Argon produces a tighter penetration cavity, perfect for fillet and butt welds.Also, if you need to weld a non-ferrous metal, iron-containing metals such as; aluminum, magnesium or titanium, MIG welding requires argon for the weld to adhere.


Oxygen is a super reactive gas; therefore, it is used in lower concentrations, usually below nine percent.OxygenIt is used to improve weld pool fluidity, penetration and arc stability in low alloy steels.

However, oxygen directly causes oxidation of metals, which weakens the overall stability of the metal, meaning it cannot be used on metals prone to oxidation.

Related reading:Is welding oxygen the same as medical oxygen?


Helium, like argon, is used for non-ferrous metals, but can also be used for stainless steels. Helium also provides a deep and wide penetration cavity, meaning it's perfect for thicker metals.

Helium is typically used in ratios of 25 to 75 percent helium to 75 to 25 percent argon. By adjusting these ratios, you will change aspects of the weld such as penetration, bead profile, and travel speed.

Helium can also be used in a mixture of argon and carbon dioxide to create a triple gas mix for maximum efficiency.

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