In the designation B-G-49A-3-C-6, what does C stand for?

In the designation B-G-49A-3-C-6, what does C stand for?

• A. CO2
• B. Carbon monoxide
• C. Carbon
• D. Calcium

Answer: (A)

In this designation, the segment that appears in the middle identifies the shielding gas used during the weld. The letter here points to the gas type, and it maps to carbon dioxide in this specific code system. Carbon dioxide is a common shielding gas for arc welding because it provides good protection for the weld bead and interacts with the molten metal in a predictable way. The other substances listed—carbon monoxide, calcium, or elemental carbon—are not used as shielding gases in standard welding practice, either because they’re toxic, reactive, or simply not gases used for shielding. So, the letter corresponds to CO2, making CO2 the correct interpretation.

In this designation, the segment that appears in the middle identifies the shielding gas used during the weld. The letter here points to the gas type, and it maps to carbon dioxide in this specific code system. Carbon dioxide is a common shielding gas for arc welding because it provides good protection for the weld bead and interacts with the molten metal in a predictable way. The other substances listed—carbon monoxide, calcium, or elemental carbon—are not used as shielding gases in standard welding practice, either because they’re toxic, reactive, or simply not gases used for shielding. So, the letter corresponds to CO2, making CO2 the correct interpretation.