Which action helps prevent arc blow?

• A. Increase distance between electrode and workpiece.
• B. Ensure proper grounding and adjust lead placement.
• C. Apply insulating coating to the workpiece.
• D. Use a larger electrode.

Answer: (B)

Arc blow happens when the magnetic fields created by the welding current interact with the ground path and workpiece, pushing the arc off course. The most reliable way to prevent it is to provide a solid, well-placed return path and keep the current’s magnetic field from biasing the arc. Attach the grounding clamp firmly to the workpiece close to the weld and arrange the electrode lead and ground lead so the return path is short and direct, reducing stray magnetic effects. This close, low-resistance ground and smart lead placement stabilize the arc and minimize wandering.

Increasing the distance between the electrode and the workpiece tends to make the arc less stable and can worsen arc blow by enlarging the loop area. Applying an insulating coating on the workpiece would prevent good electrical contact and isn’t a remedy for arc blow. Using a larger electrode changes current capacity and bead characteristics but doesn’t address the magnetic field effects causing arc blow.