Red Seal Welding Practice Exam

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What does the letter 'C' stand for in an ER70C-X electrode?

  1. Carbon

  2. Composite filler metal

  3. Compact

  4. Cobalt

The correct answer is: Composite filler metal

The letter 'C' in an ER70C-X electrode stands for "composite filler metal." This type of electrode is a combination of pure metal powder and flux, making it different from other pure metal electrodes such as ER1400. Option A, carbon, is incorrect because carbon is not the main component of this type of electrode. Option C, compact, is incorrect because compactness does not describe the composition of the electrode. Option D, cobalt, is also incorrect as cobalt is not the main component of this type of electrode.

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