Welder Red Seal · Question
A new apprentice is struggling to achieve good penetration on a mild steel butt joint in the flat (1G) position using an E7018 electrode. The arc feels sluggish, and the beads are wide with convex profiles. The machine is set to AC, and the amperage is within the manufacturer's recommended range. What change might resolve these issues?
E7018 electrodes are designed for use with DC Electrode Positive (DCEP) for optimal penetration, arc stability, and bead profile. Using AC can result in a more
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Question: A new apprentice is struggling to achieve good penetration on a mild steel butt joint in the flat (1G) position using an E7018 electrode. The arc feels sluggish, and the beads are wide with convex profiles. The machine is set to AC, and the amperage is within the manufacturer's recommended range. What change might resolve these issues?
Answer options:
- Switch to DC Electrode Negative (DCEN) ✅ Switch to DC Electrode Positive (DCEP)
- Increase travel speed
- Use a smaller electrode diameter
Correct answer: Switch to DC Electrode Positive (DCEP)
Explanation: E7018 electrodes are designed for use with DC Electrode Positive (DCEP) for optimal penetration, arc stability, and bead profile. Using AC can result in a more sluggish arc and reduced penetration, especially for this electrode type. Switching to DCEP (DC+) will concentrate more heat at the workpiece, improving penetration and creating a more desirable bead. Increasing travel speed or using a smaller electrode might help but are secondary to correcting the polarity for E7018.
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