Welder Red Seal · Question
Which combination of shielding gas and polarity is typically required to achieve an axial spray transfer in GMAW on carbon steel?
Spray transfer requires a high percentage of argon (typically above 85%) and Direct Current Electrode Positive (DCEP) polarity. This combination provides a stab
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Question: Which combination of shielding gas and polarity is typically required to achieve an axial spray transfer in GMAW on carbon steel?
Answer options:
- 100% CO2, DCEP
- 75% Argon / 25% CO2, DCEN ✅ 90% Argon / 10% CO2, DCEP
- 100% Helium, AC
Correct answer: 90% Argon / 10% CO2, DCEP
Explanation: Spray transfer requires a high percentage of argon (typically above 85%) and Direct Current Electrode Positive (DCEP) polarity. This combination provides a stable arc and promotes the smooth transfer of fine metal droplets across the arc.
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