Constant voltage (CV) welding machines produce which type of volt-amp curve?

Constant voltage (CV) welding machines produce which type of volt-amp curve?

• A. Relatively flat volt-amp curve.
• B. Drooping volt-amp curve.
• C. Rising volt-amp curve.
• D. Constantly changing volt-amp curve.

Answer: (A)

Constant voltage welding equipment keeps the arc voltage near a preset value across a wide range of welding currents. Because the voltage is held steady while current varies (due to changes in wire feed, material, or position), plotting arc voltage versus current shows little change in voltage as current changes—the volt-amp curve is essentially a horizontal, flat line. This stability in voltage makes the arc length predictable and is why CV machines are common for processes like MIG welding. If you compare to other modes, where voltage would rise or fall with current or fluctuate, the curve would not be flat, illustrating why this configuration is distinct.

Constant voltage welding equipment keeps the arc voltage near a preset value across a wide range of welding currents. Because the voltage is held steady while current varies (due to changes in wire feed, material, or position), plotting arc voltage versus current shows little change in voltage as current changes—the volt-amp curve is essentially a horizontal, flat line. This stability in voltage makes the arc length predictable and is why CV machines are common for processes like MIG welding. If you compare to other modes, where voltage would rise or fall with current or fluctuate, the curve would not be flat, illustrating why this configuration is distinct.