What type of wire feeder is used with a constant potential power source?

What type of wire feeder is used with a constant potential power source?

• A. Constant speed feeder
• B. Variable speed feeder
• C. Gravity feeder
• D. Manual feeder

Answer: (A)

With a constant-potential (constant-voltage) power source, the arc voltage stays essentially fixed. The welding current then depends largely on how much wire is fed into the arc. To keep the current and arc stable as you weld, the wire must be supplied at a steady rate. A constant-speed feeder delivers wire at a fixed rate regardless of small mechanical variations, which helps maintain a stable arc when the voltage is constant. If you used a variable-speed feeder, any change in feed rate would cause the current to shift, making the arc less stable under CV conditions. Gravity or manual feeders don’t provide the consistent, controlled feed required for this setup.

With a constant-potential (constant-voltage) power source, the arc voltage stays essentially fixed. The welding current then depends largely on how much wire is fed into the arc. To keep the current and arc stable as you weld, the wire must be supplied at a steady rate. A constant-speed feeder delivers wire at a fixed rate regardless of small mechanical variations, which helps maintain a stable arc when the voltage is constant. If you used a variable-speed feeder, any change in feed rate would cause the current to shift, making the arc less stable under CV conditions. Gravity or manual feeders don’t provide the consistent, controlled feed required for this setup.