In constant-voltage welding machines, which parameter primarily controls the welding current?

• A. Arc length
• B. Travel speed
• C. Shielding gas flow
• D. Wire Feed Speed

Answer: (D)

In constant-voltage welding machines, the current is set mainly by how fast you feed the wire. The machine holds the arc voltage at a fixed level, so increasing the wire feed speed brings more metal into the arc and requires more current to melt and transfer that wire, raising the amperage. Arc length mainly affects voltage (arc characteristics) rather than current in this mode, while shielding gas flow and travel speed influence stability, deposition, and heat input but not the electrical current directly. So the wire feed speed is the primary factor controlling the welding current.