What is the function of the welding machine's power source?

The primary function of the welding machine's power source is to provide the necessary voltage and current for the welding process. In Shielded Metal Arc Welding (SMAW), the power source ensures that the arc can be maintained between the electrode and the workpiece. The voltage determines the arc length and stability, while the current influences the heat input, penetration, and overall quality of the weld.

In SMAW, a proper power source is critical because it must be capable of delivering the right amount of energy to achieve the desired melting of the base metal and electrode without causing defects or interruptions in the welding process. The power source therefore plays a vital role in the effectiveness and efficiency of the welding operation. Each welding application may require specific settings for voltage and current to ensure optimal welding performance.