Welder Red Seal · Question
When welding a flat butt joint on 10 mm thick steel with an E7018 electrode, a welder observes a very 'choppy' arc, inconsistent penetration, and the electrode occasionally sticking. The machine is set to 150 A, DCEP. Which of the following is the most probable cause?
A poor or loose work clamp connection creates high resistance in the welding circuit, leading to an unstable, choppy arc, inconsistent current flow, and potenti
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Question: When welding a flat butt joint on 10 mm thick steel with an E7018 electrode, a welder observes a very 'choppy' arc, inconsistent penetration, and the electrode occasionally sticking. The machine is set to 150 A, DCEP. Which of the following is the most probable cause?
Answer options:
- The arc length is too short.
- The electrode is too large for the amperage. ✅ The work clamp has a poor connection.
- The amperage is set too high.
Correct answer: The work clamp has a poor connection.
Explanation: A poor or loose work clamp connection creates high resistance in the welding circuit, leading to an unstable, choppy arc, inconsistent current flow, and potential sticking of the electrode, despite the nominal settings being appropriate.
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