What type of volt-amp curve does a constant current machine produce?

What type of volt-amp curve does a constant current machine produce?

• A. Flat volt-amp curve.
• B. Variable volt-amp curve.
• C. Rising volt-amp curve.
• D. Drooping volt-amp curve.

Answer: (D)

A volt-amp curve shows how welding voltage changes as you vary current for a given power source. When a machine is set to constant current, it actively controls the current and lets the arc voltage vary to keep that current steady as conditions change (arc length, gap, electrode, etc.). Because the current is being held constant, the voltage tends to adjust downward as you look at higher current ranges, leading to a curve that slopes downward on a V-A plot. That downward-sloping, or drooping, shape reflects the current-control behavior: the arc voltage isn’t fixed, it shifts to maintain the set current.

A volt-amp curve shows how welding voltage changes as you vary current for a given power source. When a machine is set to constant current, it actively controls the current and lets the arc voltage vary to keep that current steady as conditions change (arc length, gap, electrode, etc.). Because the current is being held constant, the voltage tends to adjust downward as you look at higher current ranges, leading to a curve that slopes downward on a V-A plot. That downward-sloping, or drooping, shape reflects the current-control behavior: the arc voltage isn’t fixed, it shifts to maintain the set current.