Welder Red Seal · Question
A welder is preparing to gouge a faulty root pass from a 25 mm thick low-carbon steel pipeline joint using carbon arc gouging. Which type of carbon electrode is generally preferred for this application due to its stability and faster material removal rate?
For most carbon arc gouging applications, especially on low-carbon steel, copper-coated DC electrodes used with DCEP (reverse polarity) are preferred. The coppe
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Question: A welder is preparing to gouge a faulty root pass from a 25 mm thick low-carbon steel pipeline joint using carbon arc gouging. Which type of carbon electrode is generally preferred for this application due to its stability and faster material removal rate?
Answer options: ✅ Copper-coated, direct current electrode positive (DCEP)
- Plain carbon, direct current electrode negative (DCEN)
- Graphite, alternating current (AC)
- Copper-coated, alternating current (AC)
Correct answer: Copper-coated, direct current electrode positive (DCEP)
Explanation: For most carbon arc gouging applications, especially on low-carbon steel, copper-coated DC electrodes used with DCEP (reverse polarity) are preferred. The copper coating stabilizes the arc and aids in current transfer, while DCEP provides a focused arc and higher material removal rates.
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