If the drive-roll pressure against the electrode wire is too low, what is the result?

If the drive-roll pressure against the electrode wire is too low, what is the result?

• A. The wire will not be pulled through the feeder
• B. The wire melts too quickly
• C. The arc loses stability
• D. The shielding gas changes color

Answer: (A)

Drive-roll pressure simply acts to grip and push the electrode wire through the feeder. If that pressure is too low, the wire will slip on the drive rolls instead of being advanced, so the feeder cannot pull the wire through to the contact tip. The result is an interrupted or nonexistent wire feed, leading to a stall in welding or an erratic arc. The other options aren’t direct effects of insufficient drive pressure: they relate to different issues (melting rate, arc stability from other causes, or gas color from gas-related problems). To fix it, increase the drive-roll tension to just enough to grip the wire firmly, then test with scrap and ensure the rollers are appropriate for the wire size and condition.

Drive-roll pressure simply acts to grip and push the electrode wire through the feeder. If that pressure is too low, the wire will slip on the drive rolls instead of being advanced, so the feeder cannot pull the wire through to the contact tip. The result is an interrupted or nonexistent wire feed, leading to a stall in welding or an erratic arc. The other options aren’t direct effects of insufficient drive pressure: they relate to different issues (melting rate, arc stability from other causes, or gas color from gas-related problems). To fix it, increase the drive-roll tension to just enough to grip the wire firmly, then test with scrap and ensure the rollers are appropriate for the wire size and condition.