Why are there special requirements for arc welding power supply?

Special requirements are imposed on arc welding power supplies to ensure stable arc combustion and adapt to various welding process requirements.
To achieve this, arc welding power supplies must meet the following specific requirements:

Static characteristics (or external characteristics): This refers to the relationship between steady-state output current and output voltage. These characteristics include a drooping characteristic (constant current characteristic) and a plateau characteristic (constant voltage characteristic). Different welding methods have different requirements for power supply external characteristics. For example, stick arc welding, TIG welding, and carbon arc gouging require a drooping characteristic (constant current characteristic), while CO2/MAG/MIG arc welding requires a plateau characteristic (constant voltage characteristic).

Dynamic characteristics: The relationship between the arc welding power supply's output current and output voltage over time when the load condition changes instantaneously. This characterizes the power supply's ability to respond to load transients (i.e., its dynamic response).

No-load voltage: The voltage displayed by the power supply before arc ignition. A suitable no-load voltage is crucial for successful arc ignition.

Regulation characteristics: This refers to the ability to adapt the power supply's external characteristics to meet welding specifications. Good regulation characteristics allow the power supply to adapt to different welding materials and thicknesses.

In summary, these special requirements for arc welding power supply ensure the stability of the arc during welding, thereby improving welding quality and efficiency.