If arc blow is observed, what should you verify first?

• A. Increase amperage
• B. Change to a different welding process
• C. Move to a location with more magnetic fields
• D. Proper grounding and electrode orientation

Answer: (D)

Arc blow happens when magnetic fields around the arc push or deflect the molten metal and the arc itself, so the first thing to check is the grounding and how the current is returning from the weld. A clean, solid ground close to the joint creates a short, low-impedance return path, which reduces stray magnetic flux that can bend the arc. At the same time, the way the electrode is held and positioned affects the current path and how those magnetic fields form around the arc; the right orientation helps keep the arc stable and directed toward the weld.

If the ground is loose, far away, or contaminated, or if the electrode angle and travel direction are awkward, arc blow is more likely to occur. Once grounding and electrode orientation are set properly, you can explore other adjustments, but those two factors are the most effective first step in stabilizing the arc.