6 Best MIG Wire for Mild Steel – Which Wire Is Best For Mild Steel

Best MIG Wire for Mild Steel

One of the most frequently asked questions among beginner welders is whether mild steel can be welded. The answer to this question is yes. Armed with the right MIG welder and welding wire, you can easily weld mild steel.

There are various types of MIG welding wires you can use to weld mild steel. However, not all can be termed the best MIG wire for mild steel. Having used a variety of mig mild steel welding wires, here are my top six picks. 

I have selected these six based on their size and ability to weld mild steel. It is worth noting that these are both solid and flux core welding wires

Reviews of 6 best MIG wire for mild steel

Forney 42300 Flux Core Mig Wire

Forney 42300 Flux Core Mig Wire, Mild Steel E71TGS.030-Diameter, 2-Pound Spool
Forney 42300 Flux Core Mig Wire, Mild Steel E71TGS.030-Diameter, 2-Pound Spool
  • 0.30 inches diameter
  • 2 pounds in weight
  • 79,000 tensile strength

As its name suggests, these are flux core welding wires. So if you are planning on doing MIG welding outside these will do the job. It is important to note that this wire is designed for mild steel only.

This welding wire is suited to all welding positions and is designed for single-pass application with high travel speed. Measuring 0.30 inches in diameter, these electrodes are best suited to DCEN welding.

PROS

  • Are self-shielding and thus can be used outside in windy conditions
  • Can be used in all-positions welding
  • They run hotter than solid wires making them ideal for single-pass applications
  • The wires produce very moderate to low spatter

CONS

  • Can only be used to weld mild steel Features

verdict

This electrode takes position one on my list thanks to its performance. When you want to weld mild steel, there aren’t many welding wires that are better than this. It is the best flux core welding wire on the list.

Lincoln Electric, ED023334, MIG Welding Wire, L-56.030, Spool

LINCOLN ELECTRIC CO ER70S-6 L-56, 12.5 LB Mild Steel Mig Welding Premium Copper...
LINCOLN ELECTRIC CO ER70S-6 L-56, 12.5 LB Mild Steel Mig Welding Premium Copper...
  • 0.30 inches thick
  • 12.5 pounds spool weight
  • 70,000 tensile strength
  • Copper coated

The ED023334 MIG welding wire is a premium product from Lincoln Electric. This welding wire is ideal for welding metals with a medium to high mill scale presence. But that is not the only good thing about this wire.

With a diameter of 0.30 inches, it is coated in copper, which gives it a greater arc starting capability. It also feeds smoothly. It can be used with several shielding gas mixtures including argon and carbon dioxide mixtures.

PROS

  • Has superior arc starting abilities thanks to its copper coating
  • Is an excellent choice for welding metals with a medium to high scale presence
  • Has great wire feed ability
  • Can be used with a wide array of shielding gas mixtures

CONS

  • Works best on clean surfaces and is not suited to welding dirty, rusted or painted metals

verdict

This spool wire is designed for use with shielded MIG welding. As such, it is best suited to welding oil-free and clean metal surfaces. Its excellent arc starting capabilities and smooth feed earn it a spot on the list.

Hobart H222108-R22 10-Pound E71T-11 Carbon-Steel Flux-Cored Welding Wire

PGN - ER70S-6 .035' (0.9 mm) Mild Steel MIG Welding Wire - 11 Lbs Spool
PGN - ER70S-6 .035" (0.9 mm) Mild Steel MIG Welding Wire - 11 Lbs Spool
  • 0.030 inches wide
  • 10-pound spool
  • 70,000 tensile strength

Another spool of flux-core welding wire you can use on thin gauge metal is the Hobart H222108-R22 welding wire. This wire is particularly suited to welding thin gauge metal and galvanized steel.

But it does its best work when welding mild steel. It is 0.30 inches in thickness and is used for light fabrication and structural works. The wire comes in a 10-pound spool and is easy to use on thin gauge metal.

PROS

  • Is excellent in single or multi-pass welding of thin gauge metal
  • This welding wire can be used to weld galvanized steel as well
  • Being a flux core wire, it can be used outside in windy conditions
  • It is compatible with most MIG welders

CONS

  • Works well on thin gauge metal and not on thicker metals

verdict

For light fabrication and structural works, this welding wire excels. It is best for welding thin gauge metals. As such, it is probably the best welding wire for auto body on the list.

PGN - ER70S-6 .035" (0.9 mm) Mild Steel MIG Welding Wire - 11 Lbs Spool

INEFIL ER70S-6 .030-Inch on 10-Pound Spool Carbon Steel Mig Solid Welding Wire
INEFIL ER70S-6 .030-Inch on 10-Pound Spool Carbon Steel Mig Solid Welding Wire
  • 0.35 inches wide
  • 11-pound spool weight
  • Mild steel rod
  • Solid welding wire

The PGN –ER70S-6 is a good quality MIG welding wire that comes in an 11-pound spool. This welding wire works well on mild steel as well as carbon steel. Additionally, it can also be used to weld low alloy steel.

It feeds smoothly and has no tangle. The roll of this welding is packed in a moisture-resistant film. This is solid wire and can thus be used with MIG welders and shielding gas.

PROS

  • Packed in a moisture-resistant film for protection
  • Can be used to weld low alloy steel as well as carbon steel
  • Being a solid wire, it produces very little spatter

CONS

  • As it is a solid wire cannot be used without shielding gas

verdict

This is another excellent welding wire for welding mild steel. Additionally, it can be used for welding low alloy steel as well as carbon steel.

WeldingCity 2 Rolls of ER70S-6 ER70S6 Mild Steel MIG Welding Wire

WeldingCity 2 Rolls of ER70S-6 ER70S6 Mild Steel MIG Welding Wire 11-Lb Spool 0.030'...
WeldingCity 2 Rolls of ER70S-6 ER70S6 Mild Steel MIG Welding Wire 11-Lb Spool 0.030"...
  • 0.30 wire diameter
  • 11-pound spool
  • 2-inch centre hole
  • Two welding wire spools

These two roll of premium welding wires from welding city offer exceptional performance for welding mild steel. With this package, you get two sets of rolls. They are great for welding metals with mill scale.

Most importantly, these wires feed well and wet nicely. They also produce a nice looking bead. Also, the finished weld is strong and very durable. These are indeed premium welding wires for MIG welding mild steel.

PROS

  • These welding wires burn smoothly and consistently
  • Produce a nice looking bead
  • The wires come packed in a moisture-resistant plastic film
  • Offer good value for your money

CONS

  • A bit pricey than other welding wires

verdict

The best welding wire offers excellent performance and creates strong welds. It is for this reason that this welding wire finds its way on my list. The bead appearance you get with this welding wire is above average.

INEFIL ER70S-6 .030-Inch on 10-Pound Spool Carbon Steel Mig Solid Welding Wire

INEFIL ER70S-6 .030-Inch on 10-Pound Spool Carbon Steel Mig Solid Welding Wire
INEFIL ER70S-6 .030-Inch on 10-Pound Spool Carbon Steel Mig Solid Welding Wire
  • 0.30 inches diameter
  • 10-pound spool
  • Porosity free
  • Ar+CO2 or CO2. Compatible

Solid MIG welding wires are known for having a low spatter. And the ER70S from INEFIL is no different. This welding wire can be used with a variety of shielding gas mixes. You can use it with 100% carbon dioxide shielding gas.

But what makes this welding wire stand out is its high feedability and excellent bead appearance. This welding wire is ideal for welding carbon and carbon-manganese steel. However, it is best suited to welding mild steel.

PROS

  • This welding wire is offered at an affordable price
  • Produces good looking beads
  • Can be used with either a carbon and argon mixture or 100% carbon shielding gas
  • Creates a highly stable arc

CONS

  • Being a solid wire, it cannot be used outside

verdict

This welding wire ticks all the right boxes. It feeds well, is porosity free and produces a nice looking bead. It can also be used on carbon and carbon manganese steel.

Best mild steel welding wire buying guide

When shopping for welding wire for welding mild steel, there are several things to keep in mind. These are;

Rod material

The best welding wires are those that are made from the same material as the metal you are welding. As such, the best MIG wire for mild steel is made from mild steel. Thus when shopping for a welding wire to weld mild steel stick to those made from mild steel.

Spool size

Welding wires come in a variety of spool sizes. The spool size you select will be dependent on the type of welding machine you are using. Therefore, not all machines can accommodate a 10-pound spool.

It is essential to check the spool size that your welder can accommodate. Alternatively, you can purchase an adapter to make your welder accommodate a larger spool size.

Polarity

When welding mild steel, you need to use DCEP or direct current electrode positive. Therefore, when shopping for a welding wire for mild steel, go for one that is capable of DCEP welding.

Wire size

Wire size also depends on the type of welder you are using. You can either opt for a 0.024, 0.030 0r 0.035 inch wire sizes. Some welders are compatible with 0.030-inch wires while others work well with 0.035-inch wires.

What is mild steel ?

Mild steel is also referred to as low carbon steel. The reason being that this is a type of steel that has a low carbon composition. Generally speaking, mild steel has between 0.05% and 0.025% of carbon.

What you need to know about welding mild steel

When welding mild steel, you need to use electrodes made of the same material. As such, use mild steel electrodes to weld mild steel. Mild steel electrodes come in two variations, solid and flux core wires.

Solid wire electrodes are designed to be used indoors with external shielding gas. These electrodes are best when you want a clean finish. Flux-core wires are ideal for general purpose outdoor repair works.

How to maximize the lifespan of welding wires

There are several tips on how to increase the lifespan of your mild steel welding wire. The most useful is to clean the tips after use. This will help get rid of any contaminants.

Storing the rods in a moisture-resistant plastic bag is also recommended. From the reviews, several rods come sealed in moisture resistant bags.

Conclusion

Mild steel is a popular and inexpensive metal used in the construction of various parts. From the above reviews, it is clear that the best MIG wire for mild steel is those made from mild steel.
These welding wires come in different thicknesses. The most common are 0.30 and 0.035 inches thick.

Last update on 2020-03-26 / Affiliate links / Images from Amazon Product Advertising API

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