PAC
True or False: Power supplies for PAC are usually Constant Voltage machines using DCEN.
False
Describe a carburizing flame
produced when too little oxygen is present. End of inner flame is rough and ragged.
The fourth state of matter behind solid, liquid, and gas is?
Plasma
What device is used to connect several gas cylinders into one main delivery pipe?
manifold
True or False: Oxygen flowing through an acetylene hose can cause an explosion.
True
What are some advantages of PAC?
Describe a neutrual flame.
A neutral flame results from the correct balance of oxygen and accetylene.
Which two parts of a PAC torch wear out the fastest and need to be replaced most often?
nozzle/electrode
What type of soap must NEVER be used when checking oxygen fittings for leaks?
Oily
Acetylene becomes unstable and highly explosive at or above what pressure?
15
The "Pilot Arc" is a temporary arc that jumps between the electrode and the _____.
Torch Nozzle
What is the main job of a gas regulator?
to stabilize gas from high pressure cylinders
What is Dross?
A term used for metal removed during a cut that become attached to the metal surface.
When testing for leaks, which two parts of the system are you checking?
threaded connections and hose connections
What are the recommended filter lens shades for oxyfuel welding and cutting?
3-6
How far should the PAC torch nozzle be held above the metal (standoff distance) while cutting?
1/16-1/8
Describe and Oxidizing flame.
Produced when to much oxygen is present. The end of the inner flame is smooth and pointed.
PAC uses DCEP or DCEN?
DCEN
How do you identify an Acetylene (fuel) hose nut compared to an Oxygen nut?
The fuel nut has a groove cut into it and uses left-hand threads.
What safety device acts as a one-way valve to stop a flame from burning back to the regulator?
arrestors
Name 3 shielding gases used for PAC.
Air,Oxygen,Nitrogen,Argon/Hydrogen Blend
Which of these are the 3 most common fuel gases used for oxyfuel work?
Acetylene, Propane, and Natural Gas
Explain PAC.
Is a cutting process that uses and arc and a high-velocity ionized gas coming through a nozzle to cut all metals.
Briefly Describe lighting and adjusting the Oxy torch.
1.open the acetylene torch valve 1/16th turn
2.Light the acetylene at the torch tip using a spark lighter.
3.Open the acetylene torch valve until flame is turbulent 3/4"-1" from the end of the tip.
4.Turn on the oxygen torch valve slowly until a neutral flame is obtained
How should you clean a cylinder valve outlet before you attach the regulator?
"Crack" the valve by opening and closing it very quickly to blow out dust.