Which is the proper sequence to start an acetylene cutting torch?

• A. Turn on acetylene, light with striker, turn on oxygen, adjust flame
• B. Turn on oxygen, light with striker, turn on acetylene, adjust flame
• C. Light with striker, turn on acetylene, turn on oxygen, adjust flame
• D. Turn on acetylene, turn on oxygen, light with striker, adjust flame

Answer: (A)

When lighting an acetylene cutting torch, the safe, effective approach is to introduce the fuel first and ignite it before bringing in the oxidizer. Open the acetylene valve and let gas flow, then strike to light the flame. With the acetylene burning, gradually open the oxygen valve to mix in the oxidizer and adjust the flame to a neutral balance. This order helps prevent a flame from flashing back into the gas supply and ensures you can control the flame intensity as you establish the proper neutral flame needed for cutting. Once both gases are flowing, you fine-tune the flame for a clean, efficient cut, avoiding overly rich (carburizing) or overly oxidizing flames.