When making an overhead fillet weld (4F) with an E7018 electrode, a welder experiences difficulty maintaining the molten puddle, leading to excessive convexity and lack of fusion. What is the most likely cause and corresponding corrective action?

Question: When making an overhead fillet weld (4F) with an E7018 electrode, a welder experiences difficulty maintaining the molten puddle, leading to excessive convexity and lack of fusion. What is the most likely cause and corresponding corrective action?

Answer options:

• Amperage too low; increase amperage
• Travel speed too slow; increase travel speed ✅ Arc length too long; shorten arc length
• Electrode angle too steep; decrease working angle

Correct answer: Arc length too long; shorten arc length

Explanation: An arc length that is too long dissipates arc energy, making it harder to control the molten puddle, especially in the overhead position, and can lead to convexity and lack of fusion. Shortening the arc length concentrates the heat and makes the puddle more manageable. Amperage too low typically causes lack of fusion, but a long arc exacerbates it.