Which are the three ways to initiate an arc?

• A. Scratch
• B. Pedal
• C. Button (trigger)
• D. Scratch, pedal, button (trigger)

Answer: (D)

Arc initiation methods vary by equipment, and there are three common ways to start the arc. Scratch start involves briefly dragging the electrode across the work to ignite the arc, then lifting to establish a steady arc. Pedal start uses a foot pedal to apply current and start the arc while giving you hands-free control of heat at the moment of ignition. Button (trigger) start is when pressing a trigger on the torch sends current to start the arc, allowing immediate control of arc on/off.

Each method fits different machines and welding styles, so together they cover the main ways to begin an arc. That’s why the combined option listing all three—scratch, pedal, and button (trigger)—is the best choice.