Quiz Questions Flashcards
What do these acronyms stand for?
1. OFW
2. OAW
3. OAC
4.TB
- Oxy-fuel welding
- Oxy-acetylene welding
- Oxy-acetylene cutting
- Torch brazing
What’s the name of the line of material that oxy-fuel cutting removes?
Kerf
What range of diameters are filler rods available in?
1/16” to 3/16”
List 10 items required in an oxy-fuel welding kit.
- welding torch
- tip
- oxygen cylinder
- fuel gas cylinder
- oxygen regulator
- fuel gas regulator
- flashback arrestors
- oxygen hose
- fuel gas hose
- filler metal rods
What is the kindling temperature of carbon steels?
1600°F
What is the purpose of the small holes on the cutting torch tip?
To preheat the material to its kindling temperature
List 4 applications of OFC.
- washing bolts and rivets
- stack cutting
- gouging and scarfing
- cutting pipe and plate
What is the minimum wall thickness of an oxygen cylinder?
1/4”
How is acetone stored in acetylene cylinders?
Porous medium, eg airated cement
What is the name of the oxygen cylinder safety device?
Burstable safety disk
What is the name of the acetylene cylinder safety device?
Fusible plugs
Acetone can absorb [ ] times its weight in acetylene.
23
List 5 fuel gases.
- acetylene
- propane
- natural gas
- propylene
- hydrogen
Acetylene is produced by the reaction between [ ] and [ ].
Water and calcium carbide
Calcium carbide is made by mixing [ ] and [ ] in a blast furnace.
Lime, coke
T/F: Acetylene is unstable because it is a triple bonded molecule.
True
Which fuel gas has the highest flame temperature?
Acetylene (5600°F)
Which gas gives off the most heat?
Propane
Should leak detection be used when changing cylinders or reconnecting hoses?
No
What are 3 things to do before opening the supply valve to a regulator?
- loosen adjusting screw so no pressure is on the diaphragm
- move to the side in case of explosion
- make sure the pressure reads 0 and torch valves are closed
What pressure is the first stage of a two stage regulator reduced to?
180 to 400 psi
What pressure does the acetylene warning zone begin at?
15 psi
What are the two types of oxygen cylinders?
K type and T type
What amount of gas do T type cylinders hold, and at what compression?
335 ft³ (9.35 m³) at 2600 psi (18 MPa)
What amount of gas do K type cylinders hold, and at what compression?
244 ft³ (7 m³) at 2200 psi (15 MPa)
What fuel gases can grade T hoses be used for?
All fuel gases
What fuel gases can grade R hoses be used for?
Only acetylene
Copper and acetylene form:
Acetylide
Oxygen fittings are [L/R] hand thread.
Right
Fuel gas fittings are [L/R] hand thread.
Left
What are the two types of cutting torch?
- equal pressure
- injector
