On a constant-voltage welding machine, which parameter decreases as electrode extension increases?

On a constant-voltage welding machine, which parameter decreases as electrode extension increases?

• A. Voltage
• B. Current
• C. Wire feed rate
• D. Power

Answer: (B)

In a constant-voltage welding setup, the voltage is held near a set value, while the current varies with arc conditions. Increasing electrode extension lengthens the arc and adds resistance to the circuit. With the voltage fixed, that extra resistance makes it harder for current to flow, so the current decreases as you increase the extension. Voltage stays roughly the same because the machine regulates it, and the wire feed rate isn’t directly tied to the arc length. Since power is P = V × I, the overall power also drops as current falls, even though voltage remains constant.