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Welder Red Seal · Question

For an FCAW electrode classified as E71T-1C, what does the 'C' at the end of the designation signify?

The letter at the end of the main classification (e.g., 'C' or 'M') for a gas-shielded FCAW electrode indicates the required shielding gas. 'C' stands for 100%

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Question: For an FCAW electrode classified as E71T-1C, what does the 'C' at the end of the designation signify?

Answer options:

  • It indicates the wire is for cast iron
  • It indicates the electrode has Charpy V-notch impact requirements ✅ It indicates the recommended shielding gas is 100% CO2
  • It indicates the wire has a complex flux system

Correct answer: It indicates the recommended shielding gas is 100% CO2

Explanation: The letter at the end of the main classification (e.g., 'C' or 'M') for a gas-shielded FCAW electrode indicates the required shielding gas. 'C' stands for 100% Carbon Dioxide (CO2), while 'M' indicates a mixed gas, typically Argon/CO2.

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