What is the most common starting method to generate a pilot arc between the electrode and the tip?

• A. High-frequency spark
• B. Contact start
• C. Torch standoff
• D. O-ring

Answer: (A)

Starting a pilot arc between the electrode and the tip is most commonly done with a high-frequency spark. A rapid, high-voltage, high-frequency pulse ionizes the gas in the tiny gap, creating a small pilot arc right at the tip. This non-contact initiation lets the arc form quickly and consistently without wearing the tip from touching, and it works well even on dirty or oxidized surfaces. In contrast, touching the tip to start the arc (contact start) wears components and isn’t the typical method for a pilot arc; torch standoff refers to the distance used during cutting, not the start method; an O-ring has no role in arc initiation.