How to Properly Use a Cutting Torch

Learn the safe and proper use of cutting torches

Proper use of a cutting torch is imperative. A cutting torch employs the use of acetylene gas that heats the steel or carbon steel and oxygen pressure to cut it. Use cutting torches to cut steel when other methods do not yield the required results.

Things You'll Need

• Cutting goggles
• Leather gloves
• Tip cleaner
• Striker

Instructions

1. Position the tanks upright, tied or chained to a wall mount or on a hand truck designed for moving the tanks, to prevent tanks from falling. If a tank falls and the gauges break off, it will torpedo across the floor because the tanks contains up to 3000 lbs. of pressure, and may cause severe injury or death.

2. Wear only safety approved cutting goggles, never sunglasses.

3. Wear heavy leather gloves, safety-approved for use with cutting torches.

4. Check the connections visually on both the acetylene and oxygen tanks for any sign of oil or dirt and wipe them clean.

5. Clean the torch before each use. Use a tool referred to as a tip cleaner; locate the proper size rod to clean out the holes on the cutting torch.

6. Attach the red hose to the acetylene tank and the green hose to the oxygen tank. Do not confuse the hose attachments. Typically, acetylene tank fittings tighten in a reverse direction to prevent accidental confusion.

7. Place the steel on a safe and level surface. Work in an area free of any combustible materials including paint on a work surface.

8. Ensure proper acetylene tank pressure. Open the main acetylene valve and turn the tee handle slowly to open the regulator valve. Do not exceed 8 psi on the gauge. Open the gas valve on the cutting torch. Watch the pressure gauge; it must remain steady. Turn the valve off.

9. Ensure proper oxygen tank pressure. Open the main oxygen valve, slowly open the regulator valve and watch the pressure. Do not allow it to exceed 40 psi; optimal pressure is between 25 and 40 psi. Open the oxygen valve on the cutting torch to release oxygen. Turn the valve off.

10. Open the acetylene valve on the cutting torch.

11. Squeeze the striker to produce a spark and light the torch.

12. Adjust the acetylene valve until a flame that's 8 to 10 inches long burns at the end of the torch. The flame at this point is yellow.

13. Turn the oxygen valve on very slowly to produce a light blue flame.

14. Position the flame over the steel, 1/4 inch away, and slowly move the torch back and forth. The steel turns to a molten liquid when cut.

Tips & Warnings

• Keep a fire extinguisher within reach.

• Keep a phone nearby for quick 911 access.

• Keep acetylene tank pressure under 15 psi; over this amount increases the likelihood of an explosion.

• Oxygen and oil are a deadly combination--use extreme care.

• Do not use a cutting torch for any cutting purpose other than steel or carbon steel.

• Do not use matches or a lighter to light the torch; use only a striker.

References

• "Plumbing"; Time Life Editors; 1979
• "The Simon and Schuster Complete Guide to Home Repair and Maintenance"; Bernard Gladstone; 1987