What type of Volt/Amp curve is used with a Constant Voltage/Constant Potential (CV/CP) machine?

A relatively flat volt/amp curve is characteristic of Constant Voltage/Constant Potential (CV/CP) welding machines because these machines are designed to maintain a consistent voltage level despite variations in the welding current. This means that even as the load changes during the welding process, the machine will adjust the current automatically to keep the voltage stable.

In practical terms, this flat curve allows for increased control over the welding process, providing better penetration and bead appearance. The operator has the flexibility to move the workpiece closer or farther from the welding arc without drastically affecting the voltage, which helps in achieving more consistent welds.

This behavior is distinct from other shapes of volt/amp curves. For example, a steep curve would imply a significant change in current with small changes in voltage, indicating a high sensitivity that is not typical in CV/CP systems. Thus, when working with these machines, understanding that they operate under conditions represented by a flat volt/amp curve is essential for successful welding operations.