What does open circuit voltage indicate about the welding system?

What does open circuit voltage indicate about the welding system?

• A. Voltage present before arc initiation
• B. Voltage in the circuit while the arc is flowing
• C. Voltage across the workpiece after cooling
• D. Protective ground voltage during operation

Answer: (A)

Open circuit voltage is the voltage the welding power source presents at its output with no arc started. It represents the potential difference available to begin the arc when the electrode and workpiece are connected but not yet conducting current. This voltage helps determine how easily the arc can be struck, especially in difficult conditions like dirty or tight gaps—the higher the open circuit voltage, the more readily the arc can jump the gap. Once the arc starts, the voltage drops to the arc voltage, which is typically much lower and fluctuates during welding. So open circuit voltage specifically indicates the system’s arc-starting capability and the electrical potential available before current flows.

Open circuit voltage is the voltage the welding power source presents at its output with no arc started. It represents the potential difference available to begin the arc when the electrode and workpiece are connected but not yet conducting current. This voltage helps determine how easily the arc can be struck, especially in difficult conditions like dirty or tight gaps—the higher the open circuit voltage, the more readily the arc can jump the gap. Once the arc starts, the voltage drops to the arc voltage, which is typically much lower and fluctuates during welding. So open circuit voltage specifically indicates the system’s arc-starting capability and the electrical potential available before current flows.