Welder Red Seal · Question
When performing FCAW-G (gas-shielded flux-cored arc welding) on carbon steel, which shielding gas mixture is most commonly used for general fabrication, offering good arc stability and penetration?
A mixture of 75% Argon and 25% Carbon Dioxide is a very common and versatile shielding gas for FCAW-G on carbon steel, providing a good balance of arc stability
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Question: When performing FCAW-G (gas-shielded flux-cored arc welding) on carbon steel, which shielding gas mixture is most commonly used for general fabrication, offering good arc stability and penetration?
Answer options:
- 100% Argon ✅ 75% Argon / 25% Carbon Dioxide (Ar/CO2)
- 100% Carbon Dioxide (CO2)
- 98% Argon / 2% Oxygen (Ar/O2)
Correct answer: 75% Argon / 25% Carbon Dioxide (Ar/CO2)
Explanation: A mixture of 75% Argon and 25% Carbon Dioxide is a very common and versatile shielding gas for FCAW-G on carbon steel, providing a good balance of arc stability, penetration, and bead appearance. 100% CO2 can be used but often results in a harsher arc and more spatter, while 100% Argon is typically for GTAW or restricted GMAW applications.
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- A welder is fabricating a pressure vessel component using FCAW-G with an E70T-1 wire. The procedure specifies
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