Red Seal Welder Practice Exam

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What does 'slag' refer to in arc welding?

  1. The main filler material

  2. A byproduct that forms on the surface of the weld metal

  3. The protective layer used in welding

  4. The incomplete weld joint

The correct answer is: A byproduct that forms on the surface of the weld metal

Slag refers to a byproduct that forms on the surface of the weld metal during the arc welding process. When the welding electrode melts, its coating or the filler material reacts with the surrounding impurities and other materials, resulting in the formation of slag. This layer of slag serves several purposes: it protects the molten weld pool from atmospheric contamination, aids in the stabilization of the arc, and can help improve the overall mechanical properties of the weld upon solidification. Understanding the role of slag is crucial for welders, as it influences the quality and integrity of the weld. Proper slag removal is also important after the welding process is completed to ensure that the weld surface is clean and free from contaminants that could affect any subsequent processes or inspections.

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