The power source best suited for the short-circuit mode of metal transfer is

The power source best suited for the short-circuit mode of metal transfer is

• A. Rising arc voltage power source.
• B. Constant voltage power source.
• C. Constant current power source.
• D. Constant amperage power source.

Answer: (B)

In short-circuit metal transfer, you want the arc voltage to stay as stable as possible as the wire repeatedly touches and separates from the puddle. A constant-voltage power source provides that stable arc voltage, so the arc length stays nearly the same even as the current surges during droplet formation and short circuits. This makes the short-circuit transfer repeatable and smooth, with current naturally adjusting to the changing conditions. Rising arc voltage would push the arc length higher and destabilize the short-circuit cycle. A constant-current (or constant-amperage) source, by keeping current fixed, would force the arc voltage to swing during short circuits, leading to unstable transfer. Therefore, the best match for the short-circuit mode is a constant-voltage power source.

In short-circuit metal transfer, you want the arc voltage to stay as stable as possible as the wire repeatedly touches and separates from the puddle. A constant-voltage power source provides that stable arc voltage, so the arc length stays nearly the same even as the current surges during droplet formation and short circuits. This makes the short-circuit transfer repeatable and smooth, with current naturally adjusting to the changing conditions.

Rising arc voltage would push the arc length higher and destabilize the short-circuit cycle. A constant-current (or constant-amperage) source, by keeping current fixed, would force the arc voltage to swing during short circuits, leading to unstable transfer. Therefore, the best match for the short-circuit mode is a constant-voltage power source.