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OAW

True/False
Indicate whether the statement is true or false.
 

 1. 

The oxygen cylinder valve is opened with a wrench.
 

 2. 

The operating pressure for acetylene should never exceed 15 psi.
 

 3. 

Acetylene has no detectable odor.
 

 4. 

A cylinder cart should be used to move gas cylinders.
 

 5. 

Two types of oxyacetylene welding torches are the injector and the medium-pressure.
 

 6. 

Welding tip size is governed by the diameter of its opening.
 

 7. 

Left-hand threads are on all fittings for acetylene gas.
 

 8. 

Oxygen cylinders are packed with a porous material to store oxygen safely.
 

 9. 

Cylinders should be kept in a vertical position.
 

 10. 

A pair of pliers should be used to install the tip on a welding torch.
 

 11. 

Applying soapy water to an oxyacetylene outfit with a brush can be used to locate leaks.
 

 12. 

The cylinder valve is cracked to remove foreign matter lodged in the outlet nozzle.
 

 13. 

Open the cylinder valves to purge the welding hoses.
 

 14. 

The size of a welding tip depends on the amount of pressure used.
 

 15. 

The welder should stand to one side of the regulator when opening the cylinder valves.
 

 16. 

The acetylene needle valve should be opened fully to ensure quick lighting of the torch.
 

 17. 

A torch should be lit with the tip pointing downward.
 

 18. 

No pressure should be left in the working pressure gauges when the welding unit is shut down.
 

 19. 

An oxidizing flame has a slight feather extending from the inner cone of the flame.
 

 20. 

The correct torch tip number to use is determined by the thickness of the metal being welded.
 

 21. 

The travel speed of a torch must be reduced if the weld pool becomes too large.
 

 22. 

The welding torch is held at a 45° angle to the weld joint.
 

 23. 

When carrying a weld pool without filler metal, the inner cone of the flame is held approximately 1/8² from the workpiece.
 

 24. 

Filler metal with a diameter approximately equal to the thickness of the base metal being welded should be used.
 

 25. 

When welding in flat position, the filler metal is held at a 90° angle.
 

 26. 

Properties of the metal being welded determine the type of filler metal to be used.
 

 27. 

A hole in the weld joint results from holding the flame in one location too long.
 

 28. 

Filler metal will stick to base metal that is too hot.
 

 29. 

Tack welds are used to restrict expansion forces on the weld joint as the weld bead is deposited.
 

 30. 

The heat of the torch should be concentrated on the base metal when depositing weld beads with filler metal.
 

 31. 

Gravitational pull of molten metal is the main obstacle to a sound weld when welding in positions other than flat.
 

 32. 

Tack welding the workpieces for a horizontal butt joint requires that the edges be tightly butted against each other for maximum penetration.
 

 33. 

The amount of heat directed to the weld joint in overhead position should be regulated to prevent the weld pool from becoming too large.
 

 34. 

When welding a butt joint in vertical position, more of the flame should be directed on the weld pool.
 

 35. 

In overhead welding, if the weld pool becomes too liquid, move the torch slightly away from the joint.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 36. 

Acetylene gas ___.
a.
has a very distinctive, nauseating odor
b.
must be used in a mixture with MAPP gas
c.
is yellow in color
d.
none of the above
 

 37. 

A(n) ___ is necessary for a complete set of welding apparatus.
a.
oxygen regulator
b.
welding torch
c.
sparklighter
d.
all of the above
 

 38. 

___ can be used to determine the correct connections to be made when using oxygen and acetylene gases.
a.
Right-hand threads
b.
Notched connecting nuts
c.
Hose color
d.
all of the above
 

 39. 

To properly care for oxygen and acetylene regulators, ___.
a.
do not interchange oxygen and acetylene regulators
b.
always keep a tight connection between the regulator and the cylinder
c.
never use oil or grease on a regulator connection
d.
all of the above
 

 40. 

A ___ allows the flow of liquid or gas in one direction only.
a.
flash arrestor
b.
check valve
c.
needle valve
d.
tip
 

 41. 

In an acetylene cylinder, ___ stabilizes acetylene and allows the cylinder to be pressurized to 250 psi.
a.
oxygen
b.
carbon dioxide
c.
acetone
d.
nitrogen
 

 42. 

A ___ prevents damage to the oxygen valve.
a.
protector cap
b.
flash arrestor
c.
tip cleaner
d.
regulator
 

 43. 

A ___ hose transports oxygen.
a.
red
b.
blue
c.
green
d.
yellow
 

 44. 

Multiple cylinders are connected in line in a(n) ___ to supply acetylene to the welding stations.
a.
manifold system
b.
regulator
c.
adjusting screw
d.
needle valve
 

 45. 

A ___ is used to ignite the torch flame.
a.
flash arrestor
b.
medium-pressure torch
c.
sparklighter
d.
cylinder valve
 

 46. 

When using oxygen and acetylene cylinders, ___.
a.
chain down the cylinders
b.
crack the valves to remove any foreign matter
c.
open the acetylene cylinder one-half turn
d.
all of the above
 

 47. 

When lighting a welding torch, ___.
a.
match the tip size to the thickness of the metal
b.
always use a sparklighter to relight a flame
c.
hold the tip downward when lighting
d.
all of the above
 

 48. 

The ___ must be tested for leaks.
a.
oxygen and acetylene needle valves
b.
oxygen cylinder valve
c.
oxygen regulator inlet connection
d.
all of the above
 

 49. 

___ is the last step to take when shutting off the entire welding unit after all welding is complete.
a.
Shutting off both the acetylene and oxygen cylinder valves
b.
Removing pressure on the working gauges by opening the needle valves until the lines are drained, then promptly closing the needle valves
c.
Releasing the adjusting screws on the pressure regulators
d.
none of the above
 

 50. 

Popping is caused by ___ gas flow to the welding torch.
a.
insufficient
b.
efficient
c.
equal
d.
excessive
 

 51. 

A neutral flame results from a(n) ___-to-one mixture of oxygen and acetylene.
a.
one
b.
two
c.
four
d.
eight
 

 52. 

The welder must ___ the welding hoses to remove all residual gases.
a.
knot
b.
fill
c.
crack
d.
purge
 

 53. 

A(n) ___ flame has a slight excess of fuel gas.
a.
neutral
b.
carburizing
c.
oxidizing
d.
iron
 

 54. 

Testing for leaks requires the use of ___.
a.
welding tips
b.
oxygen
c.
soapy water
d.
acetylene
 

 55. 

An acetylene feather is present beyond the inner cone of a(n) ___ flame.
a.
backfire
b.
neutral
c.
oxidizing
d.
carburizing
 

 56. 

When welding a T-joint in flat position, the torch is held at a ___° angle to the workpiece.
a.
30
b.
45
c.
60
d.
75
 

 57. 

When welding a lap joint in flat position, ___ to prevent overheating.
a.
lift the torch 3² above the workpiece
b.
direct more heat to the top workpiece
c.
direct more heat to the bottom workpiece
d.
move the torch more slowly
 

 58. 

The correct diameter filler metal is approximately ___ the thickness of the base metal.
a.
one-half
b.
twice
c.
equal to
d.
none of the above
 

 59. 

Carrying a weld pool without filler metal requires that the inner cone of the flame be held approximately ___² from the workpiece.
a.
1/16
b.
1/8
c.
3/16
d.
1/4
 

 60. 

When using filler metal for oxyacetylene welding, ___.
a.
if the filler metal diameter is too large, the heat of the weld pool will be insufficient to melt the filler metal
b.
if the filler metal diameter is too small, the heat cannot be absorbed by the filler metal, resulting in a hole in the workpiece
c.
the filler metal should not be held above the weld pool during welding
d.
all of the above
 

 61. 

When welding a lap joint, ___.
a.
use a semicircular motion with the torch
b.
direct more heat to the bottom workpiece
c.
dip the filler metal into the middle of the weld pool
d.
all of the above
 

 62. 

The ___ of the base metal determines the diameter of the filler metal used.
a.
composition
b.
thickness
c.
surface
d.
all of the above
 

 63. 

Flux is essential when welding gray cast iron because it ___.
a.
keeps the molten weld pool fluid
b.
prevents iron oxides from becoming trapped in the weld
c.
prevents inclusions and porosity
d.
all of the above
 

 64. 

___ filler metal is commonly used for nonheat-treatable aluminum.
a.
1100
b.
4043
c.
5356
d.
all of the above
 

 65. 

When welding heavy steel more than 1/2² thick, ___.
a.
prepare the edges as a single-V bevel
b.
prepare the edges as a double-V bevel
c.
use a single pass to obtain maximum penetration
d.
use a forehand welding technique
 

 66. 

The main obstacle to a sound weld in positions other than flat position is the ___ downward on the molten metal.
a.
heat expansion
b.
cold lap
c.
gravitational pull
d.
all of the above
 

 67. 

The overhead welding position is ___.
a.
the most difficult of the main welding positions
b.
possible as long as the weld pool is not too large
c.
practiced by placing the workpieces in a suitable jig
d.
all of the above
 

 68. 

Filler metal is added ___ to prevent undercutting.
a.
closer to the bottom workpiece
b.
on top of the torch flame
c.
closer to the top workpiece
d.
none of the above
 

 69. 

Heat directed to the weld joint should be ___ to prevent the weld pool from becoming too large when welding in overhead position.
a.
increased
b.
reduced
c.
kept the same
d.
none of the above
 

 70. 

More of the flame is directed on the ___ to prevent the weld pool from becoming too fluid when welding a butt joint in vertical position.
a.
base metal
b.
filler metal
c.
weld pool
d.
none of the above
 



 
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