Question 1

The useful life of a ceramic nozzle is affected by the _____________.

Accepted Answer

A)   current level and proximity to the work
B)   tungsten type and shielding gas flow rate
C)   whether the torch is air or water cooled
D)   type of current and type of base metalE) A) and B)
F) A) and C)

Question 2

Which of the following is an inert gas?

Accepted Answer

A)   Hydrogen
B)   Oxygen
C)   Nitrogen
D)   HeliumE) A) and B)
F) B) and C)

Question 3

Which of the following is true of breaking and remelting tungsten?

Accepted Answer

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.E) B) and C)
F) A) and D)

Question 4

The ____________________ directs the shielding gas directly on the welding zone.

Accepted Answer

nozzle

Question 5

Which of the following is true of DCEN?

Accepted Answer

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.E) C) and D)
F) None of the above

Question 6

Which of the following is not true of the water-cooled GTA welding torch?

Accepted Answer

A)   It is more efficient than an air-cooled torch
B)   It is more portable than an air-cooled torch.
C)   It can use a smaller power cable.
D)   Water pressures higher than 35 psi may cause the water hoses to burst.E) B) and D)
F) C) and D)

Question 7

The ____________________ at which the current cycles is the rate at which it makes a full change in direction.

Accepted Answer

The answer of The ____________________ at which the current cycles...

Question 8

If high frequency is not used, it will be necessary to use the ____________________ technique to start the arc .

Accepted Answer

The answer of If high frequency is not used, it...

Question 9

Which of the following is true of DCEP?

Accepted Answer

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.E) B) and C)
F) A) and D)

Question 10

In order to get a good GTA weld on thick sections of metal, especially ____________________, you will need to preheat it.

Accepted Answer

The answer of In order to get a good GTA...

Question 11

DCEN concentrates about ____ of its welding heat on the work, and about ____ on the tungsten.

Accepted Answer

A)   1/3, 2/3
B)   1/4, 3/4
C)   1/2, 1/2
D)   2/3, 1/3E) B) and C)
F) A) and B)

Question 12

Due to its hardness, when hand grinding tungsten, it will become hot, and its high ____________________ means that the heat will be transmitted quickly to your fingers.

Accepted Answer

thermal co...

Question 13

Which of the following is true of erosion of the tungsten electrode?

Accepted Answer

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.E) C) and D)
F) B) and D) A

Question 14

DCEP concentrates ____ of the arc heat on the plate, and ____ of the heat on the electrode.

Accepted Answer

A)   1/3, 2/3
B)   1/4, 3/4
C)   1/2, 1/2
D)   2/3, 1/3E) A) and C)
F) A) and B) A

Question 15

The tungsten point angle can be set between a range of _____ degrees.

Accepted Answer

A)   5-15
B)   10-60
C)   50-80
D)   150-200E) A) and B)
F) A) and C)

Question 16

Which of the following is true of grinding tungsten electrodes?

Accepted Answer

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.E) A) and D)
F) All of the above

Question 17

____ results in welds with deep penetration, and a smaller-size tungsten can be used.

Accepted Answer

A)   DCEN
B)   DCEP
C)   DCRP
D)   ACHFE) C) and D)
F) All of the above

Question 18

____________________ is the time during which gas flows to clear out any air in the nozzle or surrounding the weld zone.

Accepted Answer

The answer of ____________________ is the time during which gas...

Question 19

Explain how and why to remelt tungsten.

Accepted Answer

After tungsten has been broken squarely,...

Question 20

Tungsten with the highest level of lanthanum oxide is classified as ____.

Accepted Answer

A)   EWTh-2
B)   EWLa-1.5
C)   EWLa-2
D)   EWZr-1E) B) and C)
F) A) and D)

Exam 16: Gas Tungsten Arc Welding Equipment, Setup, and Operation

The useful life of a ceramic nozzle is affected by the _____________.

Correct AnswerverifiedShow Answer

Which of the following is an inert gas?

Correct AnswerverifiedShow Answer

Which of the following is true of breaking and remelting tungsten?

Correct AnswerverifiedShow Answer

The ____________________ directs the shielding gas directly on the welding zone.

Correct Answerverifiednozzle

Which of the following is true of DCEN?

Correct AnswerverifiedShow Answer

Which of the following is not true of the water-cooled GTA welding torch?

Correct AnswerverifiedShow Answer

The ____________________ at which the current cycles is the rate at which it makes a full change in direction.

Correct AnswerverifiedShow Answer

If high frequency is not used, it will be necessary to use the ____________________ technique to start the arc .

Correct AnswerverifiedShow Answer

Which of the following is true of DCEP?

Correct AnswerverifiedShow Answer

In order to get a good GTA weld on thick sections of metal, especially ____________________, you will need to preheat it.

Correct AnswerverifiedShow Answer

DCEN concentrates about ____ of its welding heat on the work, and about ____ on the tungsten.

Correct AnswerverifiedShow Answer

Due to its hardness, when hand grinding tungsten, it will become hot, and its high ____________________ means that the heat will be transmitted quickly to your fingers.

Correct Answerverifiedthermal co...View AnswerShow Answer

Which of the following is true of erosion of the tungsten electrode?

Correct AnswerverifiedA

DCEP concentrates ____ of the arc heat on the plate, and ____ of the heat on the electrode.

Correct AnswerverifiedA

The tungsten point angle can be set between a range of _____ degrees.

Correct AnswerverifiedShow Answer

Which of the following is true of grinding tungsten electrodes?

Correct AnswerverifiedShow Answer

____ results in welds with deep penetration, and a smaller-size tungsten can be used.

Correct AnswerverifiedShow Answer

____________________ is the time during which gas flows to clear out any air in the nozzle or surrounding the weld zone.

Correct AnswerverifiedShow Answer

Explain how and why to remelt tungsten.

Correct AnswerverifiedAfter tungsten has been broken squarely,...View AnswerShow Answer

Tungsten with the highest level of lanthanum oxide is classified as ____.

Correct AnswerverifiedShow Answer

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nozzle

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DCEN concentrates about of its welding heat on the work, and about on the tungsten.

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thermal co...
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DCEP concentrates of the arc heat on the plate, and of the heat on the electrode.

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A

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After tungsten has been broken squarely,...
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