Which action helps mitigate arc blow related to grounding in GMAW?

• A. Reposition the ground clamp, separate control cables, and use a stable ground
• B. Increase travel speed drastically
• C. Reduce gas flow to minimum
• D. Use a larger electrode diameter

Answer: (B)

Arc blow happens when magnetic fields around the welding current and nearby conductors push the arc off its intended path. A good, stable grounding path near the weld minimizes those stray magnetic fields and keeps the arc centered.

Repositioning the ground clamp so it’s as close as possible to the weld, using clean, solid metal for the ground, and keeping control cables separate from the welding lead all reduce ground impedance. That combination lowers the magnetic disturbances in the arc region, which is the primary way arc blow is mitigated.

Options that focus on travel speed, shielding gas, or electrode size don’t address the grounding path. Drastically increasing travel speed changes heat input but doesn’t eliminate the magnetic effects causing arc blow. Reducing gas flow can cause shielding problems and won’t stop arc wandering. A larger electrode diameter alters current and arc characteristics but doesn’t fix the grounding issue that causes arc blow in the first place.

So, improving the grounding setup is the most reliable way to mitigate arc blow related to grounding in GMAW.