Gas Cutting(SB-4) Flashcards
What portion, if any, of a ferrous metal becomes oxidized during the oxygas cutting process?
portion directly in the path of the oxygen jet
(True or False) Metals that oxidize readily are best suited for oxygas cutting.
false
(True or False) The principal difference between a standard cutting torch and an oxygas welding torch is that the cutting torch has an extra tube for high-pressure oxygen.
true
What type of problem(s) can occur during their use if the cutting torch tips and seats are not properly matched and assembled?
improper cooling, gas flow, leakage, aota
What action should you take to keep cutting tips in proper working order when they are not in use?
store them in container with wooden rack
Which of these basic types of MAPP tips do Steelworkers often use?
standard pressure only
What can you use as a tool to clean torch tip orifices when a tip cleaner is not available?
soft copper wire
(True or False) The FS type of MAPP gas-cutting tip can be used for machine cutting.
true
(True or False) When cleaning the orifices of a tip with a cleaner, you should push the
cleaner straight into the orifices and pull it straight out without twisting.
true
With which of these tools can you correct slightly belled orifices by wearing down the end of the tip?
emery cloth
(True or False) Before starting to cut with a torch, you should inspect the working area and adjacent areas for combustibles that must be removed or covered to keep sparks or slag from igniting them.
true
What device is used to ignite a cutting torch?
spark igniter
What type of flame should you use to cut steels that produce a lot of slag?
carburizing
What distance in inches should you maintain between the preheating flame and the surface of the metal when using the cutting torch to preheat a mild-carbon steel plate?
1/16
How should the shower of sparks fall when you have started a cut properly and the cut is going all the way through the material?
opposite side of the material
Which of the following actions can save time when you need to cut a round piece of metal stock with a cutting torch?
chiseling a small burr at the starting point on the stock
What type of flame is best for piercing holes in plate?
oxidizing
One 70-pound MAPP cylinder can accomplish the work of more than _____ 225-cubic-foot acetylene cylinders.
6 and a half
What error are you making when cutting metal plate with an oxygas torch and you cause the top surfaces of the kerf to fuse?
advancing the torch too slowly
What effect does moving the cutting torch too fast have on the material during the cutting process?
oxidizing flame fails to penetrate completely
In what direction should the tip be angled when cutting a piece of steel 1/8 inch thick?
in line with direction of travel
When, if ever, can you place your cutting torch almost vertical to the surface for cutting?
cutting steel that is over 1/8 inch thick
When cutting steel greater than 1/8 inch thick, you position the torch so the preheat flames are from 1/16 to 1/8 inch from the plate. You then hold the flame at this position until the steel becomes _____ red.
cherry
(True or False) To start a cut quickly in thick plate, you should hold the cutting torch so it slants toward the direction of travel.
false
(True or False) One way you can commence a starting cut is to place an iron filler rod at
the edge of a thick metal plate and begin preheating it.
true
When cast iron is being cut, what is the preheating temperature?
500
Which of these tasks are you accomplishing by varying the speed of travel, the oxygen
pressure, and the angle of a large orifice, and by using a low-velocity-jet cutting tip on thesurface of a metal plate?
creating gouging countours
Which of these actions using a cutting torch can result in a deep, wide gouge on a metal
plate?
moving the torch too slow
When cutting bevels on a plate instead of cutting straight through on the same plate, you must use (a)_____ oxygen pressure and (b)______ cutting speed.
more pressure, slower speed
By what component(s) do you adjust a motor-driven cutting torch up and down?
gear and rack assembly
By performing which of the following actions can you check the clearance of the torch before cutting when using an electric drive carriage on a straight track?
releasing the clutch and freewheeling the carriage the full length of the track by hand
In what sequence should you secure the machine after the desired cut with the motordriven cutting torch is completed?
turn off oxygen, then flame, then current
Which of the following actions should an inexperienced operator perform to obtain a smooth bevel on heavy pipe with an oxygas cutting torch?
cut the pip off square, then cut bevel
(True or False) When cutting pipe, you should always keep the torch pointed toward the centerline of the pipe.
true
What condition can develop if you do not cut out the punch marks used to mark an outline when fabricating a T-fitting from pipe?
cracking
What is the desired distance relative to the preheating cones and the metal surfaces when you use the cutting torch to pierce holes in a steel plate?
cones are 1/4 inch above metal
What procedural step should you take just before slicing off a portion of the head when removing a rivet from a plate with a cutting torch?
cut a slot in the rivet head
What type of cutting tip with a large diameter cutting oxygen orifice is considered best suited for cutting buttonhead rivets and removing countersunk rivets?
low velocity
How can you prevent the strands of rope from unlaying when cutting wire rope with a torch?
wrap the wire roupe with seizing wire on each side
What action should you take before cutting a wire rope with an oxygas cutting torch?
fuse the ends to prevent unlaying of the wire
Acetylene is extremely dangerous if used above _____ pounds pressure.
15
What element in an acetylene cylinder can contaminate cutting torch equipment if the
cylinder is not upright when in use?
acetone
Under what conditions, if any, can you actually rest the cutting tip on the metal you are cutting?
never
A cast iron kerf is always _____ than a steel kerf due to the presence of oxides and the
torch movement.
wider
On which metal do you use a semi-circular torch movement along the cutting line?
?
(True or False) A single-stage regulator’s pressure will decrease as the cylinder pressure decreases.
true
Which characteristic indicates a good cutting job with an oxygas torch?
free of slag, smooth, aota
Which characteristics of a drag line indicates proper cutting procedures were followed?
short and vertical
What minimum distance in feet is permitted between unprotected combustibles and oxygas
cutting equipment that is being used?
30
Under which of these circumstances can a backfire occur during the operation of an oxygas cutting torch?
dirty tip, incorrect pressure, aota
What action, if any, should you take to stop a flashback safely with an oxygas cutting torch?
close off oxygen first
What component(s) of an oxygas cutting torch unit is/are usually responsible for a
flashback?
clogged orifices
When, if ever, should you weld or cut a container that once held a flammable substance?
after cleaning and filling with water
What percentage of air space inside a water-filled container should carbon dioxide occupy when it is used in a vessel for additional protection?
50
What additional safety precaution should you take when doing any hot work on water-filled tanks or containers?
vent them
