Welding Gasless MIG- TIG- A New Way to Weld?

First, What is MIG Welding?

Welding Gasless MIG refer to the welding method without the use of welding shielding gas. MIG welding is a welding process that uses a continuous solid wire electrode to produce the weld.

The wire is fed from a spool, and the welder controls the voltage and current to the weld. MIG welding is very versatile, and it can be used on a variety of different materials. It is also relatively easy to learn, and it produces high-quality welds.

MIG Welding is used for welding steel, aluminum, and copper & other materials. MIG welding is often used in industrial applications because it produces high-quality welds with little splatter and high productivity.

What is Gasless MIG Welding?

Remember, ”Gasless MIG’‘ is a ”Non-standard term” for Self-Shielded Flux Cored Arc Welding (FCAW-S) process. While the term use Gasless, it is actually not Gasless at all.

All fusion welding processes require shielding gas to protect the molten & hot weld pool from oxidation- contamination.

Welding Gasless MIG
Gasless MIG Welding

In Gasless MIG Welding or precisely FCAW-S, the shielding gases are produced by the burning of coating elements present in the cored wire. These gases protect the weld pool & does the same function as done in the MIG welding with externally supplied shielding gas.

So, Gasless MIG welding is a process that does not use an external shielding gas to protect the weld puddle from atmospheric contamination. A flux cored wire is used as the electrode, and the flux coating on the wire protects the weld puddle.

Gasless MIG welding is popular because it is easy to learn and produces good quality welds. One disadvantage of gasless MIG welding is that there is more slag to remove than with shielded MIG welding.

Gasless MIG welding process uses a flux cored wire as the electrode instead of a solid wire. This process does not require the use of welding gas and produces a slag coating on the weld bead. Gasless MIG welding can be used on ferrous and non-ferrous metals.

Gas Shielded MIG Welding

Gas shielded MIG welding is a process that uses an external gas to protect the weld from the atmosphere.

See also  Back Step Welding

This gas creates a shield around the weld that prevents oxygen and other contaminants from getting to the weld. This allows for a cleaner, stronger weld without welding defects.

One of the benefits of gas shielded MIG welding is that it produces no slag. Slag is created when the flux on the wire coating melts and slags off into the weld pool.

This slag can cause problems with the quality of the weld, as well as making it difficult to see what you are welding.

With gas shielded MIG welding, there is no flux on the wire, so there is no slag created. This makes for a much cleaner weld and makes it easier to see what you are welding.

Gas vs. Gasless MIG Welding

Gas vs. gasless MIG welding is a common question for welders. Both methods have their own advantages and disadvantages, which can make it difficult to decide which one to use.

as MIG welding uses a shielding gas, typically argon, to protect the weld from contamination.

This makes it ideal for welding thin metals, as it produces a clean and precise weld. However, gas MIG welding can be more expensive than gasless MIG welding, and it requires more equipment.

Gasless MIG welding is a process that does not use a shielding gas. Instead, an electrode is used to create the weld. This makes gasless MIG welding less expensive and simpler than gas MIG welding.

However, it can be more difficult to produce a clean weld with this method, and it is not suitable for all applications.

Gas vs. Gasless MIG Welding- Differences

Gas vs. gasless MIG welding- what’s the difference?- The main differences between the Gas shielded MIG welding and Gasless MIG Welding are listed below:

Type of Wire

The main difference between a Gasless MIG & MIG with Gas is the type of the wire. While a MIG welding with externally supplied shielding gas uses a Solid MIG wire (E.g. ER70S-2).

On the other hand, Gasless MIG (FCAW-G) uses a flux cored wire. This Flux cored wire has coating elements (E.g. Cellulose, Limestone, Wood flour) that burns and produce shielding gas (Mainly CO2). Example of Gasless MIG wire are E71T-8 (Innershield NR-232) and E71T-8.

See also  How Magnetic Particle Testing Works- With animation

Type of Welding Polarity

When doing MIG welding with solid wire, Direct Current Electrode Positive (DCEP) or also called Reverse Polarity is used. So with MIG welding with Gas is used with DCEP (Reverse Polarity).

Gasless MIG Welding can be used with Direct Current Electrode Positive (DCEP), also called Reverse Polarity or Direct Current Electrode Negative (DCEN) or also called Straight Polarity.

For example, E71T-8 (Innershield NR-232) is used with DCEN Polarity and E71T-8 used with DCEP Polarity.

Welding Slag

Gas shielded MIG Welding produces no welding slag while Gasless MIG produces slag that required to be cleaned after welding.

Welding slag is the byproduct of the welding process. It is created when the weld bead deposits and fuses with the base metal.

The coating elements presents in the flux cored wire of gasless MIG fuse and converts to slag to protect solidifying weld metal.


Gasless MIG Welding is more portable compared to Gas shielded MIG as it does not requires any external gas cylinder.

Gasless MIG can be used easily & setup is quick to carry out the welding. Welder need only MIG welder & Cored wire to make a weld.

Shielding Gas

In Gas Shielded MIG welding, a shielding gas is used to protect the weld from contamination. This can be a mixture of argon and carbon dioxide, or pure argon.

The gas creates a “shield” around the weld that prevents oxygen and other contaminants from reaching the weld puddle and causing defects.

In gasless MIG welding, no shielding gas is used. Instead, an flux cored wire is used to create a shield around the weld puddle.

This eliminates the need for special equipment and tanks, making it a more portable option.

Gas vs. Gasless MIG, Which One You Should Use?

It’s important to know the difference between gas and gasless MIG welding before you start welding.

Gas MIG welding uses a shielding gas to protect the weld from contamination, while gasless MIG welding doesn’t use a shielding gas and instead relies on a flux core wire to protect the weld.

See also  What is the difference between MIG and MAG welding?

Which one you should use depends on what you’re welding. For thin metals & welding outdoor or welding at height, gasless MIG welding is a good option, since it is lightweight and portable.

Gas MIG welding is better for thicker metals and welding in shop. Gas MIG welding is not good for welding outdoor as the air velocity can disturb the gas shielding & results in welding porosity.

What is Gasless TIG Welding?

Gasless TIG welding is a process that doesn’t rely on a shielding gas to protect the weld from contamination.

This makes it an ideal process for welding pipe root run where it is not possible to provide gas purging, or when you’re working in a tight space.

Example of Gasless TIG Wire (Flux cored TIG wire) are TG-X308L, TGX309L, TG-X316L. You can notice and identify a flux cored tig wire with initial TG-X.

Gasless TIG welding is very beneficial for welding root pass for stainless steel or other exotic material where it is not practical to provide back purging.

Gasless TIG welding can be carried out using conventional TIG welder with DCEN Polarity and using pure argon as gas shielding.

The downside is that gasless TIG welding is less tolerant of impurities in the weld than traditional TIG welding, so it’s important to clean the surfaces you’re welding and use a good quality electrode.

Similar Posts:

  1. Flux Cored Arc Welding (FCAW)
  2. FCAW-S vs. FCAW-G, FCAW-S and FCAW-G Meaning
  3. What is the difference between TIG and MIG – FCAW Welding
  4. Types of polarity in SMAW, MIG, MAG, FCAW, TIG and SAW

Material Welding is run by highly experienced welding engineers, welding trainers & ASNT NDT Level III bloggers. We strive to provide most accurate and practical knowledge in welding, metallurgy, NDT and Engineering domains.