Question 1

​How must tube- and ball-type flowmeters be mounted?

Accepted Answer

A)   ​vertically
B)   ​horizontally
C)   ​on a solid surface
D)   ​Between 5 ft and 5.5 feet above the floorE) A) and B)
F) A) and C)

Question 2

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.

Accepted Answer

noble inert
noble
inert

Question 3

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

Accepted Answer

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

Question 4

​Flowmeters measure the flow rate of a shielding gas in __________units.

Accepted Answer

A)   ​BTU or mm/sec
B)   ​CHF or L/min
C)   ​PSI or kPa
D)   ​GPH or K/minE) B) and C)
F) None of the above

Question 5

​What material should shielding gas hoses be made of?

Accepted Answer

A)   ​Any material is fine; the gas is inert
B)   ​plastic
C)   ​rubber
D)   ​copperE) A) and B)
F) None of the above

Question 6

____________________ is the time during which the gas continues flowing after the welding current has stopped.

Accepted Answer

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

Question 7

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

Accepted Answer

A)   Erosion can be completely eliminated.
B)   Erosion can be limited using DCEP current.
C)   The eroded metal does not transfer across the arc.
D)   Slow erosion results in limited tungsten inclusions in the weld.E) B) and C)
F) A) and D)

Question 8

Which of the following is true of grinding tungsten electrodes?

Accepted Answer

A)   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.
B)   A fine, hard grinding stone will result in more tungsten breakage and a poor finish.
C)   The grinder used to sharpen tungsten should have a coarse stone.
D)   A grinder should never be used to clean contaminated tungsten.E) A) and B)
F) B) and C)

Question 9

____ electrodes have a current-carrying capacity similar to that of pure tungsten, and may be used for both AC and DC welding currents.

Accepted Answer

A)   Zirconium tungsten
B)   Cerium tungsten
C)   Lanthanum tungsten
D)   Thoriated tungstenE) B) and C)
F) None of the above

Question 10

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.

Accepted Answer

A)   nozzle
B)   preflow period
C)   shielding gas
D)   postflow periodE) A) and D)
F) B) and C)

Question 11

____ additions are restricted to stainless steels because it is the primary cause of porosity in aluminum welds.

Accepted Answer

A)   Nitrogen
B)   Helium
C)   Argon
D)   HydrogenE) All of the above
F) B) and C)

Question 12

What is the most likely explanation for why DCEP has a cleaning action?

Accepted Answer

There are many theories as to why DCEP h...

Question 13

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

Accepted Answer

A)   It should be melted by striking an arc on a piece of carbon.
B)   It should be broken squarely.
C)   It should be melted with a DCEN current.
D)   It should not be melted by striking an arc on copper, as it will contaminate the tungsten.E) A) and B)
F) All of the above

Question 14

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.

Accepted Answer

The answer of When the shielding gas flow rate is...

Question 15

Which of the following is an inert gas?

Accepted Answer

A)   Nitrogen
B)   Oxygen
C)   Hydrogen
D)   HeliumE) All of the above
F) C) and D)

Question 16

​Which nozzle material is clear?

Accepted Answer

A)   ​ceramic
B)   ​alumina
C)   ​fused quartz
D)   ​silicon nitrideE) C) and D)
F) None of the above

Question 17

​What is the purpose of a gas lens?

Accepted Answer

A)   ​It filters out most of the harmful UV and some of the IR light.
B)   ​It reduces the turbulence in the shielding gas.
C)   ​It filters out dust and dirt that might be in the shielding gas due to a dirty shielding gas hose.
D)   ​It helps to see the molten weld pool by magnifying it.E) B) and C)
F) A) and D)

Question 18

Which of the following is a way to minimize erosion of the tungsten electrode?

Accepted Answer

A)   Using DCEN current.
B)   Using as high a current as possible.
C)   Using an air-cooled torch.
D)   Using as small a size of tungsten electrode as possible.E) B) and D)
F) A) and B)

Question 19

Explain how tungsten electrodes are produced.

Accepted Answer

Tungsten is produced mainly by reduction of its trioxide with hydrogen.Powdered tungsten is then purified to 99.95%, compressed, and sintered (heated to a temperature below melting where grain growth can occur) to make an ingot.The ingot is heated to increase ductility and then is swaged and drawn through dies to produce electrodes.These electrodes are available in sizes varying from .01 in.to .25 in.(0.25 mm to 6 mm) in diameter.The tungsten electrode, after drawing, has a heavy black oxide that is later chemically cleaned or ground off.

Question 20

​Tungsten electrodes that contain elements such as lanthanum or yttrium are referred to as _____.

Accepted Answer

A)   ​alternating current only electrodes
B)   ​low-hydrogen tungstens
C)   ​low-alloy tungsten electrodes
D)   ​rare earth tungstensE) A) and D)
F) A) and B) D

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

How must tube- and ball-type flowmeters be mounted?

Correct Answer
verified

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.

Correct Answer
verified
noble inert noble inert

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

Correct Answer
verified

Flowmeters measure the flow rate of a shielding gas in __________units.

Correct Answer
verified

What material should shielding gas hoses be made of?

Correct Answer
verified

____________________ is the time during which the gas continues flowing after the welding current has stopped.

Correct Answer
verified

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

Correct Answer
verified

Which of the following is true of grinding tungsten electrodes?

Correct Answer
verified

____ electrodes have a current-carrying capacity similar to that of pure tungsten, and may be used for both AC and DC welding currents.

Correct Answer
verified

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.

Correct Answer
verified

____ additions are restricted to stainless steels because it is the primary cause of porosity in aluminum welds.

Correct Answer
verified

What is the most likely explanation for why DCEP has a cleaning action?

Correct Answer
verified
There are many theories as to why DCEP h...
View Answer

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

Correct Answer
verified

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.

Correct Answer
verified

Which of the following is an inert gas?

Correct Answer
verified

Which nozzle material is clear?

Correct Answer
verified

What is the purpose of a gas lens?

Correct Answer
verified

Which of the following is a way to minimize erosion of the tungsten electrode?

Correct Answer
verified

Explain how tungsten electrodes are produced.

Tungsten electrodes that contain elements such as lanthanum or yttrium are referred to as _____.

Correct Answer
verified
D

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

​How must tube- and ball-type flowmeters be mounted?

Correct AnswerverifiedShow Answer

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.

Correct Answerverifiednoble inert noble inert

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

Correct AnswerverifiedShow Answer

​Flowmeters measure the flow rate of a shielding gas in __________units.

Correct AnswerverifiedShow Answer

​What material should shielding gas hoses be made of?

Correct AnswerverifiedShow Answer

____________________ is the time during which the gas continues flowing after the welding current has stopped.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is true of grinding tungsten electrodes?

Correct AnswerverifiedShow Answer

____ electrodes have a current-carrying capacity similar to that of pure tungsten, and may be used for both AC and DC welding currents.

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

____ additions are restricted to stainless steels because it is the primary cause of porosity in aluminum welds.

Correct AnswerverifiedShow Answer

What is the most likely explanation for why DCEP has a cleaning action?

Correct AnswerverifiedThere are many theories as to why DCEP h...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

Which of the following is an inert gas?

Correct AnswerverifiedShow Answer

​Which nozzle material is clear?

Correct AnswerverifiedShow Answer

​What is the purpose of a gas lens?

Correct AnswerverifiedShow Answer

Which of the following is a way to minimize erosion of the tungsten electrode?

Correct AnswerverifiedShow Answer

Explain how tungsten electrodes are produced.

​Tungsten electrodes that contain elements such as lanthanum or yttrium are referred to as _____.

Correct AnswerverifiedD

How must tube- and ball-type flowmeters be mounted?

Correct Answer
verified

Correct Answer
verified
noble inert noble inert

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

Correct Answer
verified

Flowmeters measure the flow rate of a shielding gas in __________units.

Correct Answer
verified

What material should shielding gas hoses be made of?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
There are many theories as to why DCEP h...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which nozzle material is clear?

Correct Answer
verified

What is the purpose of a gas lens?

Correct Answer
verified

Correct Answer
verified

Tungsten electrodes that contain elements such as lanthanum or yttrium are referred to as _____.

Correct Answer
verified
D