NOCTI Welding Practice Test 2025 – Your Complete All-in-One Guide to Exam Success!

In Shielded Metal Arc Welding (SMAW), a Constant Current power source is recommended because it provides a steady output of current, which is essential for maintaining a stable arc. This is important for the control of the welding process since variations in the arc length during welding can lead to fluctuations in the arc voltage, which a Constant Current power source is designed to compensate for. By keeping the current consistent as you change the distance between the electrode and the workpiece, it allows the welder to produce a more uniform and consistent weld bead.

Additionally, Constant Current sources are particularly effective for SMAW with stick electrodes, which require specific current levels based on the size and type of electrode being used. This helps to avoid excessive heating or electrode burn-off and allows for better control over deposition rates and penetration. While Constant Voltage sources can be advantageous for processes like GMAW, they do not provide the same level of control needed for SMAW.