Which statement is true about FCAW details?

Which statement is true about FCAW details?

• A. E70C-6M is a metal cored electrode.
• B. Gas flow rate is a fixed variable in FCAW-SS.
• C. Inverter power sources require larger transformers.
• D. 100% CO2 is the only shield gas used for FCAW-GS.

Answer: (A)

In FCAW, knowing the electrode type matters because it determines how the weld metal is deposited and what kind of shielding the process uses. The designation E70C-6M identifies a metal-cored electrode—the “M” at the end signals a metal-core wire. Metal-core wires combine a metal powder core with fluxing agents, giving high deposition rates and strong performance in a variety of conditions, which is why this statement is correct. The other points don’t fit FCAW details. Self-shielded FCAW has no external shielding gas to control, so gas flow isn’t a fixed variable there; for gas-shielded FCAW, the shielding gas and its flow are adjustable, not fixed. Inverter power sources are designed to be compact and lightweight precisely because they use high-frequency switching, not large, heavy transformers. And shielding gas for gas-shielded flux-cored welding isn’t limited to 100% CO2; other gas mixtures can be used depending on the wire and application.

In FCAW, knowing the electrode type matters because it determines how the weld metal is deposited and what kind of shielding the process uses. The designation E70C-6M identifies a metal-cored electrode—the “M” at the end signals a metal-core wire. Metal-core wires combine a metal powder core with fluxing agents, giving high deposition rates and strong performance in a variety of conditions, which is why this statement is correct.

The other points don’t fit FCAW details. Self-shielded FCAW has no external shielding gas to control, so gas flow isn’t a fixed variable there; for gas-shielded FCAW, the shielding gas and its flow are adjustable, not fixed. Inverter power sources are designed to be compact and lightweight precisely because they use high-frequency switching, not large, heavy transformers. And shielding gas for gas-shielded flux-cored welding isn’t limited to 100% CO2; other gas mixtures can be used depending on the wire and application.