I found this information below and would like to get some input from you guys. What mix do you use? What is a good "general" mix for Carbon Steel and Stainless?
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Most of the times these gasses are used in a mixture form, typically consisting of carbon dioxide, and Argon or Oxygen. Oxygen is what causes most weld defects, however, in small percentages, mixed with other gasses, it improves the arc characteristics. Argon and Carbon Dioxide can be used by themselves. In some case there is tri-mix shielding gas containing Argon, Carbon dioxide, and Helium, or, Argon, Carbon dioxide, and Oxygen.

The more common mixtures and gasses are.

C2 or 2% Carbon Dioxide and 98% Argon
C25 or 25% Carbon Dioxide and 95% Argon
100% Carbon Dioxide
100% Argon


Some basic guidelines for choosing the proper gas are as follows:

Welding of carbon steel can be done with Carbon Dioxide alone and it produces the deepest penetration, the most smoke and the roughest weld. A mixture of gasses ranging from 2% to 25% Carbon Dioxide and the rest Argon can be used. However, a higher percent of Argon will result in a smoother, better looking weld, and improves the arc characteristics.

Welding of stainless steel is typically done with C2 or 2% Carbon Dioxide and 98% Argon. In some cases there is tri-mix shielding gas containing 90% Helium, 7.5% Argon, and 2.5%Carbon dioxide.

Welding of aluminum is typically done with Argon alone, with one exception. If the aluminum being welded is thicker then ½ of an inch there may be Helium added to the mix.

Argon gas by itself works well on most exotic metals like:

Copper
Copper Alloys
Magnesium
Nickel
Nickel Alloys
Titanium