The shielding gas C15 contains which two gases?

The shielding gas C15 contains which two gases?

• A. 85% argon, 15% CO2
• B. 100% argon
• C. Argon and helium
• D. Nitrogen and CO2

Answer: (A)

Shielding gas blends in MIG welding are chosen to balance arc stability, heat input, and bead quality for a specific metal. C15 is the two-gas mix used for carbon steel, consisting of 85% argon and 15% CO2. Argon is inert, stabilizing the arc and giving a clean, smooth bead with less spatter. The small amount of CO2 adds reactivity, increasing heat input slightly and improving penetration and bead shape on mild steel. This combination provides good welds for carbon steel, unlike pure argon or other gas blends that behave differently. So the composition is 85% argon and 15% CO2.

Shielding gas blends in MIG welding are chosen to balance arc stability, heat input, and bead quality for a specific metal. C15 is the two-gas mix used for carbon steel, consisting of 85% argon and 15% CO2. Argon is inert, stabilizing the arc and giving a clean, smooth bead with less spatter. The small amount of CO2 adds reactivity, increasing heat input slightly and improving penetration and bead shape on mild steel. This combination provides good welds for carbon steel, unlike pure argon or other gas blends that behave differently. So the composition is 85% argon and 15% CO2.