What does a CV welding machine try to keep constant?

A CV (Constant Voltage) welding machine is designed to maintain a constant output voltage during the welding process. This is a crucial function because, in processes such as Gas Metal Arc Welding (GMAW), the voltage needs to remain stable to ensure a consistent arc and welding quality.

By keeping the voltage constant, the machine allows for variations in the welding parameters, such as travel speed and wire feed rate. If the travel speed increases or decreases, the machine automatically adjusts the current to maintain the set voltage, ensuring that the operator can produce a uniform weld regardless of changes in these variables.

This ability to regulate the voltage provides better control over the welding arc, facilitating smoother operation and improved bead appearance, as well as reducing defects in the weld. Thus, the focus on maintaining constant voltage is essential for achieving high-quality welds in various applications.