The spark lighter is used to:

• A. To extinguish the flame
• B. To ignite the welding flame
• C. To regulate the gas flow
• D. To gauge the temperature

Answer: (B)

In welding, the spark lighter is used to ignite the welding flame. It provides the initial ignition spark when you open the gas at the torch, allowing the gas to catch and form the flame. It isn’t meant to extinguish the flame, regulate gas flow, or measure temperature—the torch valves and regulators handle those tasks, while flame color and feel indicate temperature. After lighting, you adjust the flame to the desired neutral or carburizing/oxidizing setting as needed.