With ER70S-2, which shielding gas description best matches the typical gas mixture?

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Multiple Choice

With ER70S-2, which shielding gas description best matches the typical gas mixture?

Explanation:
Shielding gas for MIG welding with ER70S-2 is typically a blend that is mostly Argon with some CO2. In practice, you’d use about 75% to 95% Argon, with the balance being CO2. This mix gives a stable arc and good puddle control from the Argon, while the CO2 adds penetration and helps the weld fuse properly to carbon steel. Using 100% Argon tends to reduce penetration and can make fusion less reliable on carbon steel. Using 100% CO2 provides strong penetration but also more spatter and a rougher bead. Air isn’t used because the oxygen and moisture in it cause porosity and oxidation in the weld.

Shielding gas for MIG welding with ER70S-2 is typically a blend that is mostly Argon with some CO2. In practice, you’d use about 75% to 95% Argon, with the balance being CO2. This mix gives a stable arc and good puddle control from the Argon, while the CO2 adds penetration and helps the weld fuse properly to carbon steel.

Using 100% Argon tends to reduce penetration and can make fusion less reliable on carbon steel. Using 100% CO2 provides strong penetration but also more spatter and a rougher bead. Air isn’t used because the oxygen and moisture in it cause porosity and oxidation in the weld.

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