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Exploring the Differences between ER70S-6 and ER70S-2 TIG Welding Wire


welding tig wire welding wire for gtaw process er70s-2 er70s-6
We train our welders on both S2 and S6 wire.

When it comes to TIG welding, choosing the right filler metal is crucial to ensure a strong and high-quality weld. Two commonly used filler metals are ER70S-6 and ER70S-2.


ER70S-6 is a mild steel TIG welding wire that contains higher levels of silicon and manganese compared to ER70S-2. This makes it more tolerant to rusty or dirty base metals and easier to use for beginners. ER70S-6 also has a higher tensile strength and can be used for a wider range of applications, including automotive and structural welding.


On the other hand, ER70S-2 has a lower silicon and manganese content, which makes it more suitable for welding on clean base metals. It also has a lower tensile strength compared to ER70S-6 and is typically used for welding thinner materials, such as sheet metal or thin-walled tubing.


Understanding the differences between ER70S-6 and ER70S-2 TIG welding wires is important in choosing the right filler metal for your welding project. Both have their strengths and weaknesses, and the choice ultimately depends on the specific needs of the job.

It's also important to note that while these two TIG welding wires are commonly used, there are many other types of filler metals available, each with their own unique properties and characteristics. It's always best to consult with a welding expert or reference material before selecting a filler metal for your TIG welding project.


ER70S-6 TIG welding wire:

  • This is the most commonly used TIG welding wire, known for its versatility and reliability.

  • It is used for welding mild and low-alloy steels, and is an excellent choice for welding thicker materials.

  • The wire has a high silicon and manganese content, which provides good wetting and a smooth, stable arc.

  • ER70S-6 wire produces a strong, high-quality weld that is highly resistant to cracking.

  • This wire is also very easy to use, making it a popular choice for beginners.

ER70S-2 TIG welding wire:

  • This wire is similar to ER70S-6 but has a slightly higher level of deoxidizers, which makes it more suitable for welding on dirty or rusty materials.

  • ER70S-2 wire also contains more manganese and silicon, which helps to produce a stable arc and good wetting.

  • It is typically used for welding on carbon and low-alloy steels and is a good choice for thinner materials.

  • ER70S-2 wire produces a high-quality weld that is highly resistant to cracking and porosity.

  • It is also easy to use and provides good control over the welding process.

When choosing between ER70S-6 and ER70S-2 TIG welding wire, consider the following factors:

  • Material type and thickness: ER70S-6 wire is best suited for thicker materials, while ER70S-2 is better for thinner or dirtier materials.

  • Welding position: ER70S-6 wire is better suited for flat and horizontal welding positions, while ER70S-2 wire can be used in all positions.

  • Welding process: ER70S-6 is a good choice for general-purpose welding, while ER70S-2 is better suited for specific applications where a higher level of deoxidization is required.

  • Welding conditions: The conditions of the welding environment, such as temperature, humidity, and air quality, can affect the performance of the welding wire. Consider these factors when choosing between ER70S-6 and ER70S-2.

In summary, both ER70S-6 and ER70S-2 TIG welding wires are excellent choices for welding mild and low-alloy steels. While ER70S-6 is more versatile and commonly used for thicker materials, ER70S-2 is a better choice for thinner or dirtier materials. When choosing between the two, consider factors such as material type and thickness, welding position, welding process, and welding conditions to determine which wire is best suited for your specific welding needs.


Check out our other blog posts here https://www.southernarc.org/blog


About the author: Luis Alejandro is the owner and one of the instructors at Southern Arc Welding Services Ltd. Co.. He enjoys family, reading books on history, and writing to share his knowledge about the many situations welding can place us in.



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