Welder Red Seal · Question
A welder is visually inspecting an FCAW-S weld on a structural beam and observes a black, glassy, and tightly adhering slag that is difficult to remove. This indicates:
A tightly adhering, difficult-to-remove slag in FCAW often indicates excessive arc voltage or an arc that is too long, leading to a flatter, wider bead and insu
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Question: A welder is visually inspecting an FCAW-S weld on a structural beam and observes a black, glassy, and tightly adhering slag that is difficult to remove. This indicates:
Answer options:
- Optimal welding parameters and good slag release ✅ Excessive arc voltage and insufficient penetration
- The weld was too cold, resulting in poor fusion
- The shielding gas flow rate was too high
Correct answer: Excessive arc voltage and insufficient penetration
Explanation: A tightly adhering, difficult-to-remove slag in FCAW often indicates excessive arc voltage or an arc that is too long, leading to a flatter, wider bead and insufficient penetration. Good FCAW welds, especially with self-shielded wires, typically produce a more easily removable slag. Slag is relevant to FCAW-S, not FCAW-G.
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Question explanations
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