Arc wandering in welding is primarily caused by what, and what measures help mitigate it?

• A. Arc wandering is caused by magnetic fields; mitigated by proper grounding, electrode orientation, and, if needed, repositioning or re-welding.
• B. Inadequate shielding gas flow can cause spatter but does not address wandering.
• C. Low electrode polarity completely prevents arc wandering.
• D. Surface contamination of the workpiece is the sole cause of arc wandering.

Answer: (A)

Arc wandering happens when magnetic forces around the arc push it off its intended path. Those forces come from the welding current and any surrounding magnetic fields, so the arc can drift if the circuit isn’t well controlled or if the arc isn’t mentally guided by the torch angle and position. The most effective fixes start with a solid electrical setup and technique: ensure proper grounding so stray currents don’t generate unwanted magnetic fields, orient the electrode to steer the arc along the intended line, and if wandering begins, reposition the torch or re-weld to reestablish a stable arc. Keeping a consistent arc length and travel speed also helps maintain a straight, controlled arc.

Other factors like shielding gas flow mainly affect spatter and weld cleanliness rather than the arc’s wandering behavior; polarity can influence arc characteristics but doesn’t by itself prevent wandering; and surface contamination can cause other weld defects but isn’t the sole cause of arc wandering.