Welder Red Seal · Question
Which shielding gas mixture is commonly used for short-circuiting GMAW on carbon steel to provide good bead control and reduce spatter?
A C25 mixture (75% Argon / 25% CO2) provides a good balance for short-circuiting GMAW. The argon component promotes a stable arc and lower spatter, while the CO
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Question: Which shielding gas mixture is commonly used for short-circuiting GMAW on carbon steel to provide good bead control and reduce spatter?
Answer options:
- 100% Argon
- 100% CO2 ✅ 75% Argon / 25% CO2
- 90% Helium / 7.5% Argon / 2.5% CO2
Correct answer: 75% Argon / 25% CO2
Explanation: A C25 mixture (75% Argon / 25% CO2) provides a good balance for short-circuiting GMAW. The argon component promotes a stable arc and lower spatter, while the CO2 component provides deeper penetration and a hotter arc compared to pure argon.
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