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Baker TIG > Final Test > Flashcards

Final Test Flashcards

1
Q

True/False: The gas tungsten arc welding process can be used to join nearly all types and thicknesses of metal.

A

True

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2
Q

True/False: One drawback of GTA welding is that welders have an obstructed view of the molten weld pool.

A

False

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3
Q

True/False: 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.

A

False

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4
Q

True/False: If the end of the filler rod becomes oxidized it must be cut before restarting.

A

True

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5
Q

True/False: 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.

A

True

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6
Q

True/False: The amperage set on a machine and the actual welding current are often not the same.

A

True

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7
Q

True/False: Mild steel is expensive and requires the most amount of cleaning.

A

False

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8
Q

True/False: When welding mild steel, slight changes in the metal have a large effect on the welding skill required.

A

False

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9
Q

True/False: Black crusty spots appearing on weld beads are often caused by improper cleaning of the filler rod.

A

True

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10
Q

True/False: The molten aluminum weld pool has low surface tension.

A

False

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11
Q

Which of the following is a reason to use GTA welding?

A

When a close-tolerance, high-quality weld is required.

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12
Q

In GTA welding, the torch may be angled ____ for better visibility.

A

0 to 15 degrees from perpendicular

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13
Q

If the end of the filler rod is removed from the shielding gas protection protection, _____.

A

It will oxidize rapidly.

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14
Q

A _____ degree angle or less to the plate surface prevents air from being pulled into the welding zone behind the rod.

A

15

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15
Q

Which of the following is true of tungsten contamination?

A

Tungsten contamination causes a weak weld and must be cleaned.

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16
Q

Which of the following is true of welding machine settings?

A

The setting will differ for various sizes and types of tungsten from machine to machine.

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17
Q

When a weld is contaminated by the tungsten touching the molten weld pool, ____ before resuming welding.

A

Both the weld and the tungsten must be cleaned.

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18
Q

The gas preflow and postflow times depend on which of the following?

A

Nozzle size

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19
Q

The ____ possible gas flow rates and the ____ preflow or postflow time can help reduce the cost of welding.

A

Lowest, shortest.

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20
Q

Exceeding the maximum gas flow rates ____.

A

Causes weld contamination.

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21
Q

With ____, surface tension helps hold the metal in place, giving excellent bead contour.

A

Aluminum

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22
Q

With ___, cleanliness is a critical factor.

A

Aluminum

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23
Q

____ is inexpensive and requires the least amount of cleaning.

A

Mild steel

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24
Q

With ____, lack of cleanliness may cause the weld pool to show overheating and poor gas coverage.

A

Stainless Steel

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25
Q

Oxides on _____ may prevent the molten weld weld pool from flowing together.

A

Aluminum

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26
Q

Carbide precipitation is the combining of _____.

A

Carbon with chromium

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27
Q

The greater the contamination of a stainless steel weld, ____ of the bead after the weld.

A

The darker the color.

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28
Q

In the GTAW process, contamination left on the metal will be deposited in the weld because ____.

A

There is no flux to remove it.

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29
Q

The most common types of contaminants are _____.

A

Oxides, oils, and dirt.

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30
Q

The torch may be angled for better visibility, and still have the proper shielding _____.

A

Gas coverage.

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31
Q

As the gas flows out of the torch it must form a ______ around the weld.

A

Protective Zone

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32
Q

When tungsten touches the molten weld pool, _________ pulls the contamination up onto the hot tungsten.

A

Surface Tension

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33
Q

Failure to remove tungsten contamination properly will result in ________.

A

Weld failure

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34
Q

During the manufacturing process, sometimes pockets of primarily ________ has become trapped inside low carbon and mild steels.

A

Carbon Dioxide

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35
Q

With stainless steel, it is desirable to take the time and necessary precautions to make welds that are no darker than the color _______.

A

Dark Blue

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36
Q

Most GTA filler metals have some alloys, called _________, that can help prevent porosity caused by gases trapped in the base metal.

A

Deoxidizers

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37
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.

A

Aluminum

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38
Q

A thick piece of metal that is used to absorb heat is also called an _____.

A

Chill plate.

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39
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 _____ torch.

A

Plasma torch.

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40
Q

Describe how the velocity of the shielding gas and the torch angle affects the protective zone.

A

The torch angle affects the protective zone because if you move too much your weld will be unprotected from the atmosphere.

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41
Q

Explain why the filler rod end must be kept inside the protective zone.

A

The filler rod must be kept in the protective zone for it oxides quickly and can contaminate the weld.

42
Q

Explain why a few molecules of gas trapped inside microscopic pockets within the steel can cause porosity in GTA welding, but not in other types of welding.

A

There is no flux to remove it.

43
Q

True/False: In semiautomatic or automatic processes, the welder is required to work harder because of the greater demands on travel speed and current.

A

False

44
Q

True/False: The same equipment may be used for may be used for semiautomatic GMAW, FCAW, and SAW.

A

True

45
Q

True/False: Wire should not be discarded on the floor because it can work its way into a filter screen on the welding power source.

A

True

46
Q

True/False: The lower the density of a gas, the lower the flow rate required for equal arc protection.

A

False

47
Q

True/False: More amperage is required to melt the wire the faster it is fed.

A

True.

48
Q

True/False: Slight changes in the welding gun angle can be used to control the weld as the groove spacing changes.

A

True

49
Q

True/False: The amount of reactive gas required to produce the desired effects is quite small.

A

True

50
Q

True/False: Hot-rolled steel has a thin copper layer in which is formed during the rolling process.

A

False

51
Q

True/False: Vertical down welds should never be used on thin sheet metals.

A

False

52
Q

True/False: The heat produced during GMA welding is sufficient to force 100% penetration consistently, making it ideal for industrial applications.

A

False

53
Q

The equipment for _____ is more likely to be automated.

A

FCAW and SAW

54
Q

While less likely to be automated, _____ welding equipment can be automated easily.

A

GMA

55
Q

Electrode wire has a natural curve that is known as its ______.

A

Cast

56
Q

The _______ the density of a gas, the _______ will be the flow rate required for equal arc protection.

A

Lower, higher.

57
Q

The correct flow rate of a shielding gas can be set by ____.

A

Checking welding guides.

58
Q

High gas flow rates _____.

A

Waste shielding gas.

59
Q

Which of the following gases is the least dense?

A

Helium

60
Q

In GMA welding, the voltage is set ____ and the amperage is set _____.

A

On the welder, by changing the wire-feed speed.

61
Q

At any one voltage setting, ____ amperage is required to melt the wire the _____ it is fed.

A

More, faster.

62
Q

The longer the ____, the greater the _____ to the welding current.

A

Electrode extension, resistance.

63
Q

As the electrode extension is shortened, the welding current ___.

A

Decreases

64
Q

_____ is increased and ____ is decreased as the electrode extension is shortened.

A

Penetration, buildup.

65
Q

Slight changes in _____ can be used to control the weld as the groove spacing changes.

A

Welding gun angle.

66
Q

A _____ gap may require _____.

A

Wide, more penetration.

67
Q

____ provide the necessary shielding because they do not form compounds with any other substance.

A

Inert gases

68
Q

Which of the following is true of mill scale?

A

The porosity it causes is most often confined to the interior of the weld.

69
Q

Which of the following deoxidizinf elements is weak?

A

Manganese

70
Q

A weld that is high and his little or no fusion is too “cold.” To correct this, ____.

A

Stop welding and make the needed adjustments.

71
Q

The major advantages of the vertical down position technique are _____.

A

Speed, shallow penetration, and good bead appearance.

72
Q

Which of the following is true of short-circuiting arc metal transfer in the overhead position?

A

It has less molten weld pool sag.

73
Q

Often, FCAW and SAW will have a ____ amperage range than GMAW.

A

Higher

74
Q

The ______ of a wire is measured by the diameter of the circle that the wire would make if it were loosely laid on a flat surface.

A

Cast

75
Q

With the feed running, adjust the ______ so that the reel stops when the feed stops.

A

Spoil drag

76
Q

______ is the chief determinant of how effective a gas is for arc shielding.

A

Density

77
Q

The exact shielding gas ______ required for a certain job will vary depending upon the welding conditions.

A

Flow rate

78
Q

Because of the constant-potential power supply, the welding current will change as the distance between the _______ and the work changes.

A

Contact Tip

79
Q

The _____ refers to the angle between the GMA welding gun and the work as it relates to the direction of travel.

A

Welding gun angle

80
Q

Shielding gases in the gas metal arc process are used primarily to protect the molten metal from oxidation and ________.

A

Contamination.

81
Q

________ is a thin layer of dark gray or black iron oxide formed during the rolling process.

A

Mill scale

82
Q

Filler metals and fluxes usually have ________ added to them so that that adverse effects of the mill scale are reduced or eliminated.

A

Deoxidizers

83
Q

Why should wire not be discarded on the floor?

A

Because it becomes a safety hazard, especially if it gets into the welder.

84
Q

Why should you do if you need more shielding gas coverage in a windy area?

A

Put up wind blockers and get the job done as quickly but efficiently as possible.

85
Q

Explain how high gas flow rates can lead to contamination.

A

Venturi affect

86
Q

Describe how to keep the weld bead straight and uniform when visibility is limited.

A

Keep an eye on the weld pool, sparks and the bead contour.

87
Q

Explain what happens when spatter falls onto the shielding gas nozzle, and how this can be minimized.

A

When spatter calls into the nozzle is has higher chances of contaminating the weld, to prevent this, change your work-to-gun angle and lengthen your stick out.

88
Q

Define GMAW.

A

Gas metal arc welding is an arc welding process that uses a continuously fed wire and the use of a shielding gas to provide a coalescence between the arc and the work piece without the application of pressure.

89
Q

In what form is metal transferred across the arc in the axial spray metal transfer method of GMA welding?

A

It is transferred axially across the arc in hundreds of small droplets.

90
Q

What three conditions are required for the spray transfer process to occur?

A
  • Argon Shielding Gas
  • DCEP
  • Transition Current
91
Q

Why is helium added to argon when making some spray or pulsed-spray transfer welds?

A

Helium is sometimes added to provide the spray with more of a globular affect. The more helium, the more globular the weld.

92
Q

Why does DCRP help with welds on metals such as aluminum?

A

Helps clean the metal.

93
Q

Why is CO2 added to argon when making GMA spray transfer welds?

A

CO2 is added because it gives the bead better contour

94
Q

What may happen if the GMA welding electrode is allowed to strike the base metal outside of the molten weld pool?

A

It will result in a loud pop and a shower of sparks.

95
Q

What effect does shortening the electrode extension have on weld penetration?

A

More penetration and a thicker bead

96
Q

Describe the weld produced by a backhand welding angle.

A

Deeper penetration, higher bead contour.

97
Q

Describe the weld produced by a forehand welding angle.

A

Less penetration, wider bead contour.

98
Q

What components make up a GMA welding system?

A
  • Power Source
  • Gun
  • Wire Feed System
  • Shielding Gas with Flowmeter
  • Related wires and hoses
  • Wire
99
Q

What parts of a typical GMA welding gun can be replaced?

A
  • Conduit
  • Trigger
  • Gas Diffuser
  • Nozzle
  • Contact Tip
100
Q

The shielding has used on carbon steel when using the short circuit mode of transfer is….

A

Argon and CO2

101
Q

Two gases used in the GMAW process that are not inert.

A

Oxygen and carbon dioxide

Baker TIG (1 decks)

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