Questions Flashcards
1
Q
- Burns can be caused by ultraviolet light rays.
Source: Chapter 2
A
True
2
Q
- To treat a third degree burn, apply ointments or antibiotic cream.
Source: Chapter 2
A
False
3
Q
- Any cold liquid you drink can be poured on a first or second degree burn.
Source: Chapter 2
A
True
4
Q
- Too much visible light can cause temporary night blindness.
Source: Chapter 2
A
True
5
Q
- Both earmuffs and earplugs protect the outer ear from burns.
Source: Chapter 2
A
False
6
Q
- Damage to your hearing caused by high sound levels is permanent and may not be detected until later in life.
Source: Chapter 2
A
True
7
Q
- Welding and cutting lead-bearing alloys or metals whose surfaces have been painted with lead-based paint can generate lead oxide fumes.
Source: Chapter 2
A
True
8
Q
- The welding area should be ventilated and forced ventilation is best, but natural ventilation is sometimes required.
Source: Chapter 2
A
False
9
Q
- Scrap metal and electrode stubs are difficult and costly to recycle.
Source: Chapter 2
A
False
10
Q
- When using extension cords on portable power tools, the size of the conductors must be small enough to enable a drop in voltage.
Source: Chapter 2
A
False
11
Q
Burns ____.
a. are caused by heat and not light
b. are among the least common injuries in a welding shop
c. are divided into four categories
d. have a high risk of infection because of the dead tissue
Source: Chapter 2
A
d. have a high risk of infection because of the dead tissue
12
Q
- To treat a third degree burn ____.
a. apply ointments or antiseptic spray
b. remove all clothing stuck to the burn
c. cover the burned area with thick, sterile, non-fluffy dressings
d. pour iced water on the burn
Source: Chapter 2
A
c. cover the burned area with thick, sterile, non-fluffy dressings
13
Q
- ____ light is dangerous because the welder cannot feel the light while being exposed to it, and it may pass through clothing.
a. Ultraviolet c. Visible
b. Infrared d. Spectral
Source: Chapter 2
A
a. Ultraviolet
14
Q
- ____ light can cause temporary night blindness.
a. Ultraviolet c. Visible
b. Infrared d. Spectral
Source: Chapter 2
A
c. Visible
15
Q
- ____ light can cause burns, but a person will immediately feel this type of light.
a. Ultraviolet c. Visible
b. Infrared d. Spectral
Source: Chapter 2
A
b. Infrared
16
Q
- ____ respirators are air-purifying respirators that use a blower to force the ambient air through air-purifying elements to the inlet covering.
a. Air-purifying c. Powered air-purifying
b. Atmosphere-supplying d. Supplied-air
Source: Chapter 2
A
c. Powered air-purifying
17
Q
- The symptoms of lead poisoning include ____.
a. influenza symptoms
b. lung irritation and kidney damage
c. abdominal cramps and lung irritation
d. metallic taste, loss of appetite, nausea, abdominal cramps, and insomnia
Source: Chapter 2
A
d. metallic taste, loss of appetite, nausea, abdominal cramps, and insomnia
18
Q
- The symptom of acute exposure to high concentrations of cadmium fumes is ____.
a. loss of appetite c. abdominal cramps
b. lung irritation d. insomnia
Source: Chapter 2
A
b. lung irritation
19
Q
- The symptoms of exposure to zinc oxide fumes include ____.
a. influenza symptoms
b. lung irritation and kidney damage
c. abdominal cramps and lung irritation
d. metallic taste, loss of appetite, nausea, abdominal cramps, and insomnia
Source: Chapter 2
A
a. influenza symptoms
20
Q
- ____ is a gas that is produced by the ultraviolet radiation in the air in the vicinity of welding operations.
a. Argon c. Ozone
b. Phosgene d. Carbon dioxide
Source: Chapter 2
A
c. Ozone
21
Q
- ____ is formed when ultraviolet radiation decomposes chlorinated hydrocarbon.
a. Argon c. Ozone
b. Phosgene d. Carbon dioxide
Source: Chapter 2
A
b. Phosgene
22
Q
- Any system of ventilation should draw the fumes or smoke away before it rises past the level of the welder’s ____.
a. shin c. chest
b. hip d. face
Source: Chapter 2
A
d. face
23
Q
- General work clothing should ____.
a. be made of a synthetic fabric c. be tightly woven and a dark color
b. be loosely woven, and a light color d. have deep pockets
Source: Chapter 2
A
c. be tightly woven and a dark color
24
Q
- The best material to use for special protective clothing is ____.
a. polyester c. 100% wool
b. 100% cotton d. leather
Source: Chapter 2
A
d. leather
25
Q
- Stored oxygen and fuel gas cylinders ____.
a. can be stored separately or together
b. must be separated by 20 feet
c. must be separated by a 20 ft. high wall
d. must be separated by 5 feet
Source: Chapter 2
A
b. must be separated by 20 feet
26
Q
- Acetylene cylinders that have been lying on their sides must stand upright for at least ____ hours before they are used.
a. two c. four
b. three d. five
Source: Chapter 2
A
c. four
27
Q
- ____ fire extinguishers are used for combustible solids.
a. Type A c. Type C
b. Type B d. Type D
Source: Chapter 2
A
a. Type A
28
Q
- ____ fire extinguishers are used for electrical fires.
a. Type A c. Type C
b. Type B d. Type D
Source: Chapter 2
A
c. Type C
29
Q
- A ____ is the symbol for a Type C fire extinguisher.
a. green triangle c. blue circle
b. red square d. yellow star
Source: Chapter 2
A
c. blue circle
30
Q
- ____ fire extinguishers are used for combustible metals such as zinc and magnesium.
a. Type A c. Type C
b. Type B d. Type D
Source: Chapter 2
A
d. Type D
31
Q
- If a nut or bolt is too tight to loosen with a wrench, ____.
a. use a cheater bar c. use a smaller wrench
b. use a longer wrench d. cut the nut or bolt off
Source: Chapter 2
A
b. use a longer wrench
32
Q
- Welding cable must be spliced ____ the electrode holder.
a. within 10 feet of c. within 20 feet of
b. more than 10 feet away from d. more than 20 feet away from
Source: Chapter 2
A
b. more than 10 feet away from
33
Q
- To test a grinding stone for cracks ____.
a. tap the stone in four places and listen for a ring
b. visually inspect the stone
c. shine a light under the stone
d. wet the stone and look for bubbles
Source: Chapter 2
A
a. tap the stone in four places and listen for a ring
34
Q
- ____ are usually either hydraulic or flywheel operated.
a. Cut-off machines c. Power punches
b. Shears d. Band saws
Source: Chapter 2
A
c. Power punches
35
Q
- The base of a ladder should be set out a distance equal to ____ the height to the point of support.
a. one-fourth of c. one and a half times
b. half of d. twice
Source: Chapter 2
A
a. One-fourth of
36
Q
- _____________________ respirators are atmosphere-supplying respirators that admit breathing air to the facepiece only when a negative pressure is created inside the facepiece by inhalation.
Source: Chapter 2
A
Demand
37
Q
- Most paints containing ____________________ have been removed from the market; however, some industries, such as marine or ship applications, still use them.
Source: Chapter 2
A
Lead
38
Q
- ____________________ is a metal used in large quantities in the manufacture of brass and is found in brazing rods.
Source: Chapter 2
A
Zinc
39
Q
- Acetylene is absorbed in ____________________.
Source: Chapter 2
A
acetone
40
Q
- Highly combustible materials should be ____________________ feet or more away from any welding.
Source: Chapter 2
A
35
thirty-five
thirty five
41
Q
- Green hoses are to be used only for ____________________.
Source: Chapter 2
A
oxygen
42
Q
- Electrical ____________________ is lowered in the presence of water or moisture, so welders must take special precautions when working under damp or wet conditions.
Source: Chapter 2
A
resistance
43
Q
- Amps is the abbreviation for amperes, which is a measure of electric ____________________.
Source: Chapter 2
A
current
44
Q
- A(n) ____________________ will prevent an accidental separation of a tool cord from an extension cord during operation.
Source: Chapter 2
A
knot
cord connector
45
Q
- When a grinding stone wears down, keep the tool rest adjusted to within ____________________ of an inch.
Source: Chapter 2
A
1/16
one-sixteenth
one sixteenth
46
Q
- When the GTAW process was first developed, argon was the primary shielding gas used.
Source: Chapter 15
A
False
47
Q
- When the GTAW process was first developed, argon was the primary shielding gas used.
Source: Chapter 15
A
False
48
Q
- Tungsten erosion can be limited by using a water-cooled torch.
Source: Chapter 15
A
True
49
Q
- DCEP has the lowest heat concentration on the electrode tip.
Source: Chapter 15
A
False
50
Q
- Tungsten is hard but brittle, and has a low impact strength.
Source: Chapter 15
A
True
51
Q
- A strong alkaline can be used to chemically clean and point tungsten.
Source: Chapter 15
A
True
52
Q
- As much as 20% of the heat generated by a GTA welding torch does not enter the weld.
Source: Chapter 15
A
False
53
Q
- Fused quartz nozzles are no more expensive than ceramic nozzles, but are more easily broken.
Source: Chapter 15
A
False
54
Q
- All three types of welding current can be used for GTA welding.
Source: Chapter 15
A
True
55
Q
- The shielding gas flow rate should be as high as possible.
Source: Chapter 15
A
False
56
Q
- A steep angle between the torch and the work may draw in air.
Source: Chapter 15
A
True
57
Q
- In GTAW, the arc temperature is around ____ degrees Fahrenheit.
a. 3,000 c. 11,000
b. 6,000 d. 17,000
Source: Chapter 15
A
c. 11,000
58
Q
- Which of the following is true of erosion of the tungsten electrode?
a. Slow erosion results in limited tungsten inclusions in the weld.
b. Erosion can be limited using DCEP current.
c. Erosion can be completely eliminated.
d. The eroded metal does not transfer across the arc.
Source: Chapter 15
A
a. Slow erosion results in limited tungsten inclusions in the weld.
59
Q
- Which of the following is a way to minimize erosion of the tungsten electrode?
a. Using as high a current as possible.
b. Using an air-cooled torch.
c. Using as small a size of tungsten electrode as possible.
d. Using DCEN current.
Source: Chapter 15
A
d. Using DCEN current.
60
Q
- In general the current-carrying capacity at DCEN is about ____ than that at DCEP.
a. one hundred times less c. ten times greater
b. ten times less d. one hundred times greater
Source: Chapter 15
A
c. ten times greater
61
Q
- Which of the following is true of DCEN?
a. DCEN concentrates the heat in the tip of the electrode.
b. With DCEN, a pointed tip concentrates the arc.
c. With DCEN, arc starting with a high-voltage electrical discharge is more difficult.
d. With DCEN, the electrode becomes damaged in a short period of time.
Source: Chapter 15
A
b. With DCEN, a pointed tip concentrates the arc.
62
Q
- Which of the following is true of DCEP?
a. With DCEP, the preferred electrode tip is pointed.
b. Because DCEP does not put much heat on the tip, it is relatively cool.
c. DCEP has the highest heat concentration on the electrode tip.
d. With DCEP, the point of the electrode tip is stable.
Source: Chapter 15
A
c. DCEP has the highest heat concentration on the electrode tip.
63
Q
- ____ has the poorest heat resistance and electron emission characteristic of all the tungsten electrodes.
a. Pure tungsten c. Zirconium tungsten
b. Thoriated tungsten d. Lanthanum tungsten
Source: Chapter 15
A
a. Pure tungsten
64
Q
- ____ is very well suited for making welds on steel, steel alloys (including stainless), nickel alloys, and most other metals other than aluminum or magnesium.
a. Pure tungsten c. Zirconium tungsten
b. Thoriated tungsten d. Lanthanum tungsten
Source: Chapter 15
A
b. Thoriated tungsten
65
Q
- Adding ____ has the same effect on the electrode characteristic as thorium, but is not radioactive.
a. pure tungsten c. zirconium
b. cerium d. lanthanum
Source: Chapter 15
A
c. zirconium
66
Q
- ____ electrodes have a current-carrying capacity similar to that of pure tungsten, and may be used for both AC and DC welding currents.
a. Thoriated tungsten c. Zirconium tungsten
b. Cerium tungsten d. Lanthanum tungsten
Source: Chapter 15
A
b. Cerium tungsten
67
Q
- The improved electron emission of the ____ allows it to carry approximately 20% more current than pure tungsten.
a. thoriated tungsten c. zirconium tungsten
b. cerium tungsten d. lanthanum tungsten
Source: Chapter 15
A
a. thoriated tungsten
68
Q
- Which of the following is true of grinding tungsten electrodes?
a. A grinder should never be used to clean contaminated tungsten.
b. The grinder used to sharpen tungsten should have a coarse stone.
c. A fine, hard grinding stone will result in more tungsten breakage and a poor finish.
d. If the grinder is used for metals other than tungsten, particles of these metals may become trapped on the tungsten as it is ground, resulting in contamination when the arc is started.
Source: Chapter 15
A
d. If the grinder is used for metals other than tungsten, particles of these metals may become trapped on the tungsten as it is ground, resulting in contamination when the arc is started.
69
Q
- Which of the following is true of breaking and remelting tungsten?
a. It should be melted with a DCEN current.
b. It should be broken squarely.
c. It should be melted by striking an arc on a piece of carbon.
d. It should not be melted by striking an arc on copper, as it will contaminate the tungsten.
Source: Chapter 15
A
b. It should be broken squarely.
70
Q
- Water hose fittings have ____ threads, and gas hose fittings have ____ threads.
a. left-hand, left-hand c. right-hand, left-hand
b. left-hand, right-hand d. right-hand, right-hand
Source: Chapter 15
A
b. left-hand, right-hand
71
Q
- DCEP concentrates ____ of the arc heat on the plate, and ____ of the heat on the electrode.
a. 1/3, 2/3 c. 1/2, 1/2
b. 1/4, 3/4 d. 2/3, 1/3
Source: Chapter 15
A
a. 1/3, 2/3
72
Q
- DCEN concentrates about ____ of its welding heat on the work, and about ____ on the tungsten.
a. 1/3, 2/3 c. 1/2, 1/2
b. 1/4, 3/4 d. 2/3, 1/3
Source: Chapter 15
A
d. 2/3, 1/3
73
Q
- ____ produces wide welds with shallow penetration.
a. DCEN c. DCEP
b. DCSP d. ACHF
Source: Chapter 15
A
c. DCEP
74
Q
- ____ results in welds with deep penetration, and a smaller-size tungsten can be used.
a. DCEN c. DCRP
b. DCEP d. ACHF
Source: Chapter 15
A
a. DCEN
75
Q
- AC concentrates about ____ of its welding heat on the work and ____ on the tungsten.
a. 1/3, 2/3 c. 1/2, 1/2
b. 1/4, 3/4 d. 2/3, 1/3
Source: Chapter 15
A
c. 1/2, 1/2
76
Q
- Which of the following is an inert gas?
a. Hydrogen c. Nitrogen
b. Oxygen d. Helium
Source: Chapter 15
A
d. Helium
77
Q
- ____ is denser than air, so it effectively shields welds in deep grooves in the flat position.
a. Helium c. Hydrogen
b. Nitrogen d. Argon
Source: Chapter 15
A
d. Argon
78
Q
- With ____, penetration and bead profile are sensitive to arc length, and the long arcs needed for feeding filler wires are more difficult to control.
a. helium c. hydrogen
b. nitrogen d. argon
Source: Chapter 15
A
a. helium
79
Q
- ____ is relatively easy to ionize and thus is suitable for alternating-current applications and easier starts.
a. Helium c. Hydrogen
b. Nitrogen d. Argon
Source: Chapter 15
A
d. Argon
80
Q
- ____ additions are restricted to stainless steels because it is the primary cause of porosity in aluminum welds.
a. Helium c. Hydrogen
b. Nitrogen d. Argon
Source: Chapter 15
A
c. Hydrogen
81
Q
- The ____ protects the molten weld pool, the filler rod, and the tungsten electrode as they cool to a temperature at which they will not oxidize rapidly.
a. preflow period c. shielding gas
b. postflow period d. nozzle
Source: Chapter 15
A
b. postflow period
82
Q
- The gas tungsten arc welding process is sometimes referred to as ____________________.
Source: Chapter 15
A
TIG
heliarc
tungsten inert gas welding
83
Q
- The ____________________ is the cone-shaped sleeve that holds the electrode in the torch.
Source: Chapter 15
A
collet
84
Q
- ____________________, when added in percentages of up to 0.6 percent to tungsten, improves its current-carrying capacity.
Source: Chapter 15
A
Thorium oxide
ThO2
85
Q
- The ____________________ directs the shielding gas directly on the welding zone.
Source: Chapter 15
A
nozzle
cup
nozzle or cup
cup or nozzle
86
Q
- The ____________________ at which an alternating current cycles is the rate at which it makes a full change in direction.
Source: Chapter 15
A
frequency
87
Q
- ____________________ is a by-product of the natural gas industry. It is removed from natural gas as the gas undergoes separation for purification or refinement.
Source: Chapter 15
A
Helium
88
Q
- Argon and helium are _________________________ gases, which means they will not combine chemically with any other material, and will not affect the molten weld pool in any way.
Source: Chapter 15
A
noble inert
noble
inert
89
Q
- ____________________ is the time during which gas flows to clear out any air in the nozzle or surrounding the weld zone.
Source: Chapter 15
A
Preflow
90
Q
- ____________________ is the time during which the gas continues flowing after the welding current has stopped.
Source: Chapter 15
A
Postflow
91
Q
- When the shielding gas flow rate is high, air is drawn into the gas envelope by a(n) ____________________ effect around the edge of the nozzle.
Source: Chapter 15
A
venturi
92
Q
- The gas tungsten arc welding process can be used to join nearly all types and thicknesses of metal.
Source: Chapter 16
A
True
93
Q
- One drawback of GTA welding is that welders have an obstructed view of the molten weld pool.
Chapter 16
A
False
94
Q
- Charts and graphs that give the correct amperage, gas flow rate, and time for various welds and metals were designed for optimum conditions in the field.
Source: Chapter 16
A
False
95
Q
- If the end of the filler rod becomes oxidized it must be cut off before restarting.
Source: Chapter 16
A
True
96
Q
- The indicated power to a weld from two different types of welding machines set at 100 amperes will vary depending upon the voltage of the machine.
Source: Chapter 16
A
True
97
Q
- The amperage set on a machine and the actual welding current are often not the same.
Source: Chapter 16
A
True
98
Q
- Mild steel is expensive and requires the most amount of cleaning.
Source: Chapter 16
A
False
99
Q
- When welding mild steel, slight changes in the metal have a large effect on the welding skill required.
Source: Chapter 16
A
False
100
Q
- Black crusty spots appearing on weld beads are often caused by improper cleaning of the filler rod.
Source: Chapter 16
A
True
101
Q
- The molten aluminum weld pool has low surface tension.
Source: Chapter 16
A
False
102
Q
- Which of the following is a reason to use GTA welding?
a. When the weld appearance is not important.
b. When speed is required.
c. When fine control of the welding process is not needed.
d. When a close-tolerance, high-quality weld is required.
Source: Chapter 16
A
d. When a close-tolerance, high-quality weld is required.
103
Q
- In GTA welding, the torch may be angled ____ for better visibility.
a. perpendicular to the work c. 15 to 30 degrees from perpendicular
b. 0 to 15 degrees from perpendicular d. 30 to 45 degrees from perpendicular
Source: Chapter 16
A
b. 0 to 15 degrees from perpendicular
104
Q
- If the end of the filler rod is removed from the shielding gas protection, ____.
a. it will cool rapidly c. air will mix with the shielding gas
b. it will oxidize rapidly d. turbulence will increase
Source: Chapter 16
A
b. it will oxidize rapidly
105
Q
- A ____ degree angle or less to the plate surface prevents air from being pulled into the welding zone behind the rod.
Source: Chapter 16
A
a. 15
106
Q
- An oxide layer on aluminum is ____, while on iron it is ____.
a. black, reddish c. white, black
b. reddish, gray d. white, reddish
Source: Chapter 16
A
a. black, reddish
107
Q
- Which of the following is true of tungsten contamination?
a. Tungsten contamination causes a weak weld and must be cleaned.
b. Tungsten particles will not show up, even if the weld is x-rayed.
c. Tungsten contamination is rare and easily controlled.
d. Tungsten particles in the weld will have no effect on the weld.
Source: Chapter 16
A
a. Tungsten contamination causes a weak weld and must be cleaned.
108
Q
- Welding power in watts is equal to the ____.
a. welding amperage c. volts multiplied by amperes
b. voltage setting d. volts divided by amperes
Source: Chapter 16
A
c. volts multiplied by amperes
109
Q
- Which of the following is true of welding machine settings?
a. The welding machine range is the same from machine to machine.
b. The setting will be the same for a given thickness of metal from machine to machine.
c. The setting will be the same for a given polarity from machine to machine.
d. The setting will differ for various sizes and types of tungsten from machine to machine.
Source: Chapter 16
A
d. The setting will differ for various sizes and types of tungsten from machine to machine.
110
Q
- When a weld is contaminated by the tungsten touching the molten weld pool, ____ before resuming welding.
a. the tungsten must be cleaned
b. the weld must be cleaned
c. both the weld and the tungsten must be cleaned
d. neither the weld nor the tungsten needs to be cleaned
Source: Chapter 16
A
c. both the weld and the tungsten must be cleaned
111
Q
- The gas preflow and postflow times depend on which of the following?
a. Travel speed c. Filler rod angle
b. Torch angle d. Nozzle size
Source: Chapter 16
A
d. Nozzle size
112
Q
- The ____ possible gas flow rates and the ____ preflow or postflow time can help reduce the cost of welding.
a. highest, shortest c. highest, longest
b. lowest, shortest d. lowest, longest
Source: Chapter 16
A
b. lowest, shortest
113
Q
- Exceeding the maximum gas flow rates ____.
a. saves time and reduces the cost c. causes weld contamination
b. decreases weld contamination d. decreases rejection rate
Source: Chapter 16
A
c. causes weld contamination
114
Q
- With ____, surface tension helps hold the metal in place, giving excellent bead contour.
a. mild steel c. stainless steel
b. aluminum d. low carbon steel
Source: Chapter 16
A
b. aluminum
115
Q
- With ____, cleanliness is a critical factor.
a. mild steel c. stainless steel
b. aluminum d. low carbon steel
Source: Chapter 16
A
b. aluminum
116
Q
- ____ is inexpensive and requires the least amount of cleaning.
a. Mild steel c. Stainless steel
b. Aluminum d. Low carbon steel
Source: Chapter 16
A
a. Mild steel
117
Q
- ____ is somewhat affected by cleanliness, requiring little preweld cleaning.
a. Mild steel c. Stainless steel
b. Aluminum d. Low carbon steel
Source: Chapter 16
A
c. Stainless steel
118
Q
- With ____, lack of cleanliness may cause the weld pool to show overheating and poor gas coverage.
a. mild steel c. stainless steel
b. aluminum d. low carbon steel
Source: Chapter 16
A
c. stainless steel
119
Q
- Oxides on ____ may prevent the molten weld pool from flowing together.
a. mild steel c. stainless steel
b. aluminum d. low carbon steel
Source: Chapter 16
A
b. aluminum
120
Q
- Carbon is the primary alloy in the classification of low carbon and mild steel, and ranges from ____ for mild steel.
a. 0.01% to .15% c. 0.15% to .20%
b. 0.10% to .15% d. 0.15% to .30%
Source: Chapter 16
A
d. 0.15% to .30%
121
Q
- Carbide precipitation is the combining of ____.
a. carbon with chromium c. carbide with water
b. carbide with hydrogen d. carbon with oxygen
Source: Chapter 16
A
a. carbon with chromium
122
Q
- The greater the contamination of a stainless steel weld, ____ of the bead after the weld.
a. the lighter the color c. the whiter the color
b. the redder the color d. the darker the color
Source: Chapter 16
A
d. the darker the color
123
Q
- Using a ____ arc current setting with ____ travel speeds is important when welding stainless steel.
a. high, slower c. low, slower
b. high, faster d. low, faster
Source: Chapter 16
A
d. low, faster
124
Q
- Carbide precipitation occurs in some stainless steels when they are kept at a temperature between ____ degrees Fahrenheit for a long period of time.
a. 800 and 1500 c. 1500 and 2100
b. 1000 and 2100 d. 1700 and 2100
Source: Chapter 16
A
a. 800 and 1500
125
Q
- In the GTAW process, contamination left on the metal will be deposited in the weld because ____.
a. the low arc temperature does not vaporize it
b. the low amperage does not allow it to be burned off
c. tungsten contamination is a constant problem that cannot be eliminated
d. there is no flux to remove it
Source: Chapter 16
A
d. there is no flux to remove it
126
Q
- The most common types of contaminants are ____.
a. oxides, oils, and dirt c. oxides and tungsten deposits
b. oxides and carbon deposits d. carbide precipitation
Source: Chapter 16
A
a. oxides, oils, and dirt
127
Q
- The torch may be angled for better visibility, and still have the proper shielding ____________________.
Source: Chapter 16
A
gas coverage
128
Q
- As the gas flows out of the torch it must form a(n) ____________________ around the weld.
Source: Chapter 16
A
protective zone
129
Q
- When tungsten touches the molten weld pool, ____________________ pulls the contamination up onto the hot tungsten.
Source: Chapter 16
A
surface tension
130
Q
- Failure to remove tungsten contamination properly will result in ____________________.
Source: Chapter 16
A
weld failure
failure of the weld
131
Q
- During the manufacturing process, sometimes pockets of primarily ____________________ gas become trapped inside low carbon and mild steels.
Source: Chapter 16
A
carbon dioxide
132
Q
- With stainless steel, it is desirable to take the time and necessary precautions to make welds that are no darker than the color ____________________.
Source: Chapter 16
A
dark blue
133
Q
- Most GTA filler metals have some alloys, called ____________________, that can help prevent porosity caused by gases trapped in the base metal.
Source: Chapter 16
A
deoxidizers
134
Q
- ___________________ is GTA welded using an EWP, EWZr, EWCe-2, or EWLa-1 rounded tip tungsten, with the welding machine set for ACHF welding current.
Source: Chapter 16
A
Aluminum
135
Q
- A thick piece of metal that is used to absorb heat is also called a(n) ____________________.
Source: Chapter 16
A
chill plate
136
Q
- Mild steel weld coupons can have the welds removed using an OFC torch, but welds on stainless and aluminum coupons will have to be cut out with a(n) ____________________ torch.
Source: Chapter 16
A
PAC
Plasma arc
137
Q
- Gas tungsten arc welding of pipe is used when the welded joint must have a high degree of integrity.
Source: Chapter 17
A
True
138
Q
- The ends of pipe need not be grooved before welding.
Source: Chapter 17
A
False
139
Q
- The end of the pipe is prepared with a 75 degree bevel.
Source: Chapter 17
A
False
140
Q
- Incomplete fusion is caused by not enough heat penetrating the back side of the work.
Source: Chapter 17
A
True
141
Q
- The depth to which a weld must penetrate in a pipe joint is given in the code or standards being used.
Source: Chapter 17
A
True
142
Q
- Incomplete fusion can form a stress point.
Source: Chapter 17
A
True
143
Q
- A concave root surface must be inspected with destructive testing.
Source: Chapter 17
A
False
144
Q
- Root contamination caused by the surrounding atmosphere is not a major problem when welding on mild steel pipe.
Source: Chapter 17
A
True
145
Q
- A hot pass will not correct problems caused by a poor root pass.
Source: Chapter 17
A
False
146
Q
- The filler pass should have deep penetration and complete fusion.
Source: Chapter 17
A
False
147
Q
- Both the ____ and the ____ can be easily flame cut or ground, which makes them the most frequently used groove joints for training.
a. single V-groove, single U-groove c. single V-groove, single bevel-groove
b. single U-groove, single bevel-groove d. single J-groove, single U-groove
Source: Chapter 17
A
c. single V-groove, single bevel-groove
148
Q
- The end of the pipe is prepared with a ____ bevel.
a. 15 degree c. 30 degree
b. 17 1/2 degree d. 37 1/2 degree
Source: Chapter 17
A
d. 37 1/2 degree
149
Q
- The end of the pipe is prepared with a bevel, leaving a root face of ____ inch.
a. 1/16 to 1/8 c. 3/32 to 1/8
b. 1/16 to 1/4 d. 1/8 to 1/4
Source: Chapter 17
A
a. 1/16 to 1/8
150
Q
- After the bevel has been cut, the root face is created by ____.
a. the bevel itself c. cutting a suitable gap in the pipe
b. grinding or machining the root edge d. cutting a U-groove
Source: Chapter 17
A
b. grinding or machining the root edge
151
Q
- Failure to remove the root edge may result in ____.
a. porosity c. a concave root surface
b. poor penetration d. grapes
Source: Chapter 17
A
c. a concave root surface
152
Q
- Before the joint is assembled, to remove any sources of contamination, clean a ____ inch wide or wider band, both inside and outside of the pipe.
a. one half c. one and a half
b. one d. two
Source: Chapter 17
A
b. one
153
Q
- In preparing the pipe for welding, the pipe should be tack welded together with a root opening of ____ inch.
Source: Chapter 17
A
c. 3/32 to 1/8
154
Q
- Most codes and standards for GTA pipe welding require ____ percent root penetration.
a. 90 c. 98
b. 95 d. 100
Source: Chapter 17
A
d. 100
155
Q
- Most codes and standards for GTA pipe welding require no more than ____ inch of root reinforcement.
Source: Chapter 17
A
a. 1/16
156
Q
- Two of the most common root defects are ____.
a. porosity and slag inclusions
b. slag inclusions and suck back
c. grapes and porosity
d. incomplete fusion and concave root surface
Source: Chapter 17
A
d. incomplete fusion and concave root surface
157
Q
- ____ can result in premature cracking or failure of the weld at a load well under its expected strength.
a. Porosity c. Stress points
b. Contamination d. Oxidization
Source: Chapter 17
A
c. Stress points
158
Q
- Incomplete fusion can be detected by ____.
a. an x-ray c. visual inspection
b. a root bend test d. cutting a cross-section of the weld
Source: Chapter 17
A
b. a root bend test
159
Q
- Which of the following is a common cause of a concave root surface?
a. Insufficient filler metal c. Poor shielding
b. Insufficient heat d. Contamination of the weld surface
Source: Chapter 17
A
a. Insufficient filler metal
160
Q
- Concavity of the root surface is detected by ____.
a. x-ray testing c. destructive testing
b. visual inspection d. cutting a cross-section of the weld
Source: Chapter 17
A
b. visual inspection
161
Q
- The amount of concavity in a root surface can be given as ____.
a. a percentage of the total weld width
b. the smallest number and smallest size of spots per inch of weld
c. a percentage of the effective throat
d. a percentage of the width at the narrowest point
Source: Chapter 17
A
c. a percentage of the effective throat
162
Q
- ____ result(s) from excessive heat, temperature, and filler metal during welding.
a. Porosity c. Suck back
b. Grapes d. Incomplete penetration
Source: Chapter 17
A
b. Grapes
163
Q
- Whether the root of the weld has excessive root reinforcement can be determined by ____.
a. visual inspection c. cutting a cross-section of the weld
b. x-ray testing d. destructive testing
Source: Chapter 17
A
a. visual inspection
164
Q
- Which of the following is a measure of root reinforcement?
a. Percentage of the total weld width
b. The smallest number and smallest size of spots per inch of weld
c. Percentage of the effective throat
d. The maximum distance from the metal surface to the longest spot of excessive reinforcement
Source: Chapter 17
A
d. The maximum distance from the metal surface to the longest spot of excessive reinforcement
165
Q
- Which of the following is a cause of contamination of the back side of the molten weld pool?
a. Failure to remove the root edge
b. Insufficient heat, insufficient filler metal
c. Overheating, poor cleaning procedures
d. Excessive root reinforcement
Source: Chapter 17
A
c. Overheating, poor cleaning procedures
166
Q
- ____ can lead to faster corrosion, oxide flaking, weld brittleness, leaks, stress points, or all of these.
a. Concave root surface c. Grapes
b. Excessive root reinforcement d. Root contamination
Source: Chapter 17
A
d. Root contamination
167
Q
- ____ can be used to back any type of pipe if a welder is unsure about a less expensive substitution.
a. Nitrogen c. Oxygen
b. Carbon dioxide d. Argon
Source: Chapter 17
A
d. Argon
168
Q
- To contain backing gas in a pipe of small diameter, or short sections of pipe, ____.
a. the ends of the pipe are capped
b. the pipe is plugged on either side of the weld
c. the pipe is plugged using water-soluble plugs
d. the pipe is plugged using soft plastic bags
Source: Chapter 17
A
a. the ends of the pipe are capped
169
Q
- To purge the air out of a 10 foot section of 6 inch diameter pipe, if the flow rate is 20 cfh, the flow time will be approximately ____.
a. 3 minutes c. 7 minutes
b. 6 minutes d. 9 minutes
Source: Chapter 17
A
b. 6 minutes
170
Q
- ____ help to reduce the number of repairs or rejections when welding under less than ideal conditions, such as in a limited space.
a. Consumable inserts c. Backing strips
b. Tack welds d. Preplaced filler rods
Source: Chapter 17
A
a. Consumable inserts
171
Q
- The filler pass(es) should fill the groove as much as possible but not more than to a ____ inch thickness at a time.
Source: Chapter 17
A
b. 1/4
172
Q
- A concave root surface is sometimes known as ____________________.
Source: Chapter 17
A
suck back
173
Q
- The ____________________ of a weld is the deepest point into the joint where fusion between the base metal and the filler metal occurs.
Source: Chapter 17
A
root
174
Q
- The ____________________ is the distance between the original surface of the joint and the deepest point of fusion.
Source: Chapter 17
A
root penetration
175
Q
- The ____________________ is the amount of metal deposited on the back side of a welded joint.
Source: Chapter 17
A
root reinforcement
176
Q
- The ____________________ of the root surface results in reduced thickness of the weld.
Source: Chapter 17
A
concavity
177
Q
- Uneven buildup and burn-through are sometimes referred to as ____________________.
A
grapes
178
Q
- Excessive root reinforcement can cause reduced material flow, result in clogged pipes, or form ____________________ that will result in premature weld failure.
Source: Chapter 17
A
stress points
179
Q
- The easiest method of protecting the root from atmospheric contamination is to use a(n) ____________________.
Source: Chapter 17
A
backing gas
180
Q
- ____________________ are preplaced filler metal used for the root pass when consistent, high-quality welds are required.
Source: Chapter 17
A
Consumable inserts
181
Q
- The ____________________ is the next weld layer(s) to be made after the hot pass.
Source: Chapter 17
A
filler pass
