Welder Red Seal · Question
When performing overhead welding (4F position) with an E7018 electrode on mild steel, a welder experiences excessive spatter and a very fluid puddle that is difficult to control. The machine settings are currently 120 A with DCEN polarity (straight polarity). What adjustment should the welder make to improve the weld quality?
E7018 electrodes are designed to be run with DCEP (reverse polarity) for optimal performance, providing deeper penetration and a more stable arc with less spatt
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Question: When performing overhead welding (4F position) with an E7018 electrode on mild steel, a welder experiences excessive spatter and a very fluid puddle that is difficult to control. The machine settings are currently 120 A with DCEN polarity (straight polarity). What adjustment should the welder make to improve the weld quality?
Answer options:
- Increase amperage to 135 A and switch to DCEP.
- Decrease amperage to 105 A and switch to DCEN. ✅ Maintain amperage and switch to DCEP.
- Increase amperage to 135 A and maintain DCEN.
Correct answer: Maintain amperage and switch to DCEP.
Explanation: E7018 electrodes are designed to be run with DCEP (reverse polarity) for optimal performance, providing deeper penetration and a more stable arc with less spatter. Running it on DCEN causes a very fluid puddle and excessive spatter due to the heat being concentrated on the electrode.
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