Torch Basics
The main purpose of an oxy-acetylene torch?
Cutting or Welding Metal
Personal protective equipment (PPE) should be worn when using a torch?
Gloves, safety glasses, flame-resistant clothing.
Signs the steel is ready to cut with a torch?
Heat until red-hot, then depress the oxygen lever.
How do you identify the oxygen regulator?
It usually has right-hand threads and a green label.
What happens if you open acetylene too fast?
It may cause a loud pop or small explosion
The two gases used in oxy-acetylene torches?
Oxygen and acetylene.
Always check for what before lighting a torch?
Leaks, proper connections, and damage.
What should you avoid when making a cut?
Going too fast, which causes incomplete cutting.
How do you check for leaks around fittings?
Use a soap and water solution.
What’s a flashback?
Flame travels back into the torch or hose—very dangerous.
The color is the oxygen hose typically
Green
The first step in an emergency gas leak
Turn off all valves and evacuate the area
This type of gas regulator features a red scale on the low-pressure gauge and is designed with left-hand threads to prevent accidental connections with oxygen regulators.
What is an acetylene regulator?
What pressure is usually set for cutting oxygen?
30–40 psi, depending on tip and material.
What’s a sign of a clogged tip?
Uneven or sputtering flame.
Which gas is turned on first when lighting the torch?
Acetylene
Gas cylinder storage
Upright, secured, in a well-ventilated area away from heat.
What’s the main cause of a poor-quality cut?
Incorrect flame or cutting speed.
What tool is used to open and close cylinder valves?
Wrench
What causes backfire?
Touching the tip to the metal or incorrect gas pressure.
The acetylene must never be used above 15 psi because?
It becomes unstable and explosive above 15 psi.
Why do you purge the lines before lighting the torch?
To remove air or mixed gases that could cause a dangerous flashback.
This is the color is the inner cone of a proper neutral flame
Bright white or blue.
What is the function of the pressure regulator?
Reduces cylinder pressure to a usable working pressure.
Why should hoses be kept away from sparks and heat?
To prevent melting or explosions.