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Anrique...I use a 75/25 mix of argon and CO2.  That's 75% argon and 25% carbon dioxide.  If you're welding mild carbon steel, which is the place to start as a new weldor, this is a good balance.  According to Miller:

Gas selection

  • A 75 percent argon/25 percent carbon dioxide blend (also called 75/25 or C25) works as the best all purpose shielding gas for carbon steel. It produces the least amount of spatter, best bead appearance and won't promote burn-through on thinner metals.
  • 100 percent CO2 provides deeper penetration, but also increases spatter and the bead will be rougher than with 75/25

Some additional quick tips for learning the right techniques can be found at Miller's website:

https://www.millerwelds.com/resources/article-library/mig-welding-the-basics-for-mild-steel

Moses

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