Power Supply Variables. The self-correcting arc property of the (CV) power supply is important in producing stable welding conditions, but there are additional adjustments necessary to produce the best possible condition. These are particularly important for short circuiting welding.
Voltage. Arc voltage is the electrical potential between the electrode and the workpiece. This voltage cannot be directly read at the power supply because other voltage drops exist throughout the welding system. The arc voltage varies in the same direction as the arc length; therefore, increasing or decreasing the output voltage of the power source will increase or decrease the arc length.
Or wire feed weld :)