A welder is working on a bridge structure, using FCAW to join heavy steel plates in the vertical-up position. The specification requires good penetration, adequate strength, and good low-temperature impact toughness. They select an E71T-5 electrode. What might be a concern with this selection for this application?

Question: A welder is working on a bridge structure, using FCAW to join heavy steel plates in the vertical-up position. The specification requires good penetration, adequate strength, and good low-temperature impact toughness. They select an E71T-5 electrode. What might be a concern with this selection for this application?

Answer options: ✅ E71T-5 is generally not recommended for out-of-position welding.

• E71T-5 typically requires additional external shielding gas, which is not stated.
• E71T-5 is known for poor low-temperature impact toughness.
• E71T-5 generally produces excessive slag that is hard to remove in multi-pass welds.

Correct answer: E71T-5 is generally not recommended for out-of-position welding.

Explanation: E71T-5 electrodes are primarily designed for flat and horizontal positions due to their fast-freezing slag system, which might not adequately support the weld puddle when welding in vertical-up or overhead positions. For out-of-position welding, electrodes like E71T-1 are generally preferred. E71T-5 does require external shielding gas but stating that it's 'not stated' doesn't make it a concern with the electrode itself. While impact toughness can vary, the positional limitations are a more immediate concern.