Welder Red Seal · Question
When welding with DC current on thick ferromagnetic steel, 'arc blow' can become a problem. What is arc blow?
Arc blow is the phenomenon where the electric arc is deflected by magnetic fields. In DC welding, the current creates a magnetic field in the steel, which can b
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Question: When welding with DC current on thick ferromagnetic steel, 'arc blow' can become a problem. What is arc blow?
Answer options:
- The rapid expulsion of shielding gas from the nozzle. ✅ The deflection of the arc from its intended path due to magnetic forces.
- A sudden increase in arc voltage causing spatter.
- The sound produced by a very short arc length.
Correct answer: The deflection of the arc from its intended path due to magnetic forces.
Explanation: Arc blow is the phenomenon where the electric arc is deflected by magnetic fields. In DC welding, the current creates a magnetic field in the steel, which can become unbalanced at the ends of plates or in corners, pushing or pulling the arc and causing inconsistent welds.
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