A constant voltage welding power source primarily maintains a steady level of which parameter?

A constant voltage welding power source primarily maintains a steady level of which parameter?

• A. Voltage
• B. Current
• C. Resistance
• D. Arc length

Answer: (A)

Constant voltage welding power sources aim to keep the arc voltage steady. The power source uses feedback to hold the arc voltage at or near a set value, while the welding current becomes the variable that shifts in response to changes in the arc conditions. Because the arc behaves like a load whose resistance changes with arc length, shortening the arc lowers resistance and causes the current to rise, while lengthening the arc raises resistance and current falls, all while voltage stays roughly constant. This stability in arc voltage helps maintain a consistent arc appearance and heat input during welding. The other options aren’t maintained by a constant voltage source: current varies with load, resistance isn’t a separately controlled parameter, and arc length is a physical condition that affects the load rather than the power source actively regulating it.

Constant voltage welding power sources aim to keep the arc voltage steady. The power source uses feedback to hold the arc voltage at or near a set value, while the welding current becomes the variable that shifts in response to changes in the arc conditions. Because the arc behaves like a load whose resistance changes with arc length, shortening the arc lowers resistance and causes the current to rise, while lengthening the arc raises resistance and current falls, all while voltage stays roughly constant. This stability in arc voltage helps maintain a consistent arc appearance and heat input during welding. The other options aren’t maintained by a constant voltage source: current varies with load, resistance isn’t a separately controlled parameter, and arc length is a physical condition that affects the load rather than the power source actively regulating it.