Question 1

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

Accepted Answer

carbon dioxide

Question 2

Under what conditions is the amperage set on a machine equal to the actual welding current?

Accepted Answer

The amperage indicated on the machine's control is the same as that at the arc only for the following conditions:
*The power to the machine is exactly correct.
*The lead length is very short.
*All cable connections are perfect with zero resistance.
*The arc length is exactly the right length.
*The remote current control is in the full on position.

Question 3

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.

Accepted Answer

During most other types of welding, fluxes on the filler metal capture these gas pockets and they are removed.However, because GTA filler metals do not have fluxes when these gas pockets become hot during welding, they expand and can sometimes cause weld porosity.

Question 4

​How can a welder improve the shielding gas coverage of a weld?

Accepted Answer

A)  ​Weld as fast as possible. 
B)  ​Use a low amperage setting to avoid arc blow. 
C)  ​Hold the torch as close and as perpendicular as possible. 
D)  ​Use a higher shielding gas flow rate. 
A)  ​Weld as fast as possible. 
B)  ​Use a low amperage setting to avoid arc blow. 
C)  ​Hold the torch as close and as perpendicular as possible. 
D)  ​Use a higher shielding gas flow rate.

Question 5

​What can cause porosity (tiny bubbles) to form on some welds on mild steel?

Accepted Answer

A)  ​A chemical reaction between the filler metal and the mild steel. 
B)  ​Using the wrong type of tungsten electrode. 
C)  ​Small pockets of CO2 trapped inside of the steel during manufacturing. 
D)  ​Too much heat and the metal begins to boil. 
A)  ​A chemical reaction between the filler metal and the mild steel. 
B)  ​Using the wrong type of tungsten electrode. 
C)  ​Small pockets of CO2 trapped inside of the steel during manufacturing. 
D)  ​Too much heat and the metal begins to boil.

Question 6

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

Accepted Answer

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. 
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.

Question 7

An oxide layer on aluminum is ____, while on iron it is ____.

Accepted Answer

A)  black, reddish 
B)  reddish, gray 
C)  white, black 
D)  white, reddish 
A)  black, reddish 
B)  reddish, gray 
C)  white, black 
D)  white, reddish

Question 8

Welding power in watts is equal to the ____.

Accepted Answer

A)  welding amperage 
B)  voltage setting 
C)  volts multiplied by amperes 
D)  volts divided by amperes 
A)  welding amperage 
B)  voltage setting 
C)  volts multiplied by amperes 
D)  volts divided by amperes

Question 9

​Why would a welder stick the end of the filler rod in the weld pool as the weld is being stopped?

Accepted Answer

A)  ​It accidentally happens sometimes but they would not do it on purpose. 
B)  ​To prevent dropping it when changing positions. 
C)  ​To help to prevent crater cracking. 
D)  ​It cools off the end of the filler rod to prevent oxidization. 
A)  ​It accidentally happens sometimes but they would not do it on purpose. 
B)  ​To prevent dropping it when changing positions. 
C)  ​To help to prevent crater cracking. 
D)  ​It cools off the end of the filler rod to prevent oxidization.

Question 10

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

Accepted Answer

A)  highest, shortest 
B)  lowest, shortest 
C)  highest, longest 
D)  lowest, longest 
A)  highest, shortest 
B)  lowest, shortest 
C)  highest, longest 
D)  lowest, longest

Question 11

​Why would a welder need to make a list of machine settings?

Accepted Answer

A)  ​To study for an exam. 
B)  ​To make it easier to reset the machine for different setups that might be needed. 
C)  ​To demonstrate to their classmates that they know how to make the correct settings. 
D)  ​To bring in the classroom for a test. 
A)  ​To study for an exam. 
B)  ​To make it easier to reset the machine for different setups that might be needed. 
C)  ​To demonstrate to their classmates that they know how to make the correct settings. 
D)  ​To bring in the classroom for a test.

Question 12

​Welds on stainless steel ____________ than welds on mild steel.

Accepted Answer

A)  ​are a lot harder to do 
B)  ​show contamination easier 
C)  ​have a lot more porosity problems 
D)  ​require a lot more skill and are much harder to learn 
A)  ​are a lot harder to do 
B)  ​show contamination easier 
C)  ​have a lot more porosity problems 
D)  ​require a lot more skill and are much harder to learn

Question 13

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

Accepted Answer

A)  15 
B)  20 
C)  25 
D)  30 
A)  15 
B)  20 
C)  25 
D)  30

Question 14

​When setting up to make a GTA weld on low carbon steel, the tungsten should be ________ and the welding machine set for____________.

Accepted Answer

A)  ​rounded, AC 
B)  ​pointed, DCEN 
C)  ​set 1 in.(25 mm) out of the nozzle, DCEN 
D)  ​even with the nozzle, DCEP 
A)  ​rounded, AC 
B)  ​pointed, DCEN 
C)  ​set 1 in.(25 mm) out of the nozzle, DCEN 
D)  ​even with the nozzle, DCEP

Question 15

Exceeding the maximum gas flow rates ____.

Accepted Answer

A)  saves time and reduces the cost 
B)  decreases weld contamination 
C)  causes weld contamination 
D)  decreases rejection rate 
A)  saves time and reduces the cost 
B)  decreases weld contamination 
C)  causes weld contamination 
D)  decreases rejection rate

Question 16

Carbon is the primary alloy in the classification of low carbon and mild steel, and ranges from ____ for mild steel.

Accepted Answer

A)  0.01% to .15% 
B)  0.10% to .15% 
C)  0.15% to .20% 
D)  0.15% to .30% 
A)  0.01% to .15% 
B)  0.10% to .15% 
C)  0.15% to .20% 
D)  0.15% to .30%

Question 17

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

Accepted Answer

The answer of Most GTA filler metals have some alloys,...

Question 18

Explain how a new student may clean a practice weld of tungsten contamination.

Accepted Answer

When starting to weld, the beginning stu

Question 19

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

Accepted Answer

A)  mild steel 
B)  aluminum 
C)  stainless steel 
D)  low carbon steel 
A)  mild steel 
B)  aluminum 
C)  stainless steel 
D)  low carbon steel

Question 20

​What should be done to the end of the filler rod if it becomes oxidized?

Accepted Answer

A)  ​The end of the rod should be cut off. 
B)  ​Melt it off before it is going to be added to the weld pool. 
C)  ​Get a new piece of filler metal to restart the weld. 
D)  ​Nothing, the oxides are lighter than the weld metal and will float on top of the weld pool. 
A)  ​The end of the rod should be cut off. 
B)  ​Melt it off before it is going to be added to the weld pool. 
C)  ​Get a new piece of filler metal to restart the weld. 
D)  ​Nothing, the oxides are lighter than the weld metal and will float on top of the weld pool.

Exam 17: Gas Tungsten Arc Welding of Plate

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

Under what conditions is the amperage set on a machine equal to the actual welding current?

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.

​How can a welder improve the shielding gas coverage of a weld?

​What can cause porosity (tiny bubbles) to form on some welds on mild steel?

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

An oxide layer on aluminum is ____, while on iron it is ____.

Welding power in watts is equal to the ____.

​Why would a welder stick the end of the filler rod in the weld pool as the weld is being stopped?

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

​Why would a welder need to make a list of machine settings?

​Welds on stainless steel ____________ than welds on mild steel.

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

​When setting up to make a GTA weld on low carbon steel, the tungsten should be ________ and the welding machine set for____________.

Exceeding the maximum gas flow rates ____.

Carbon is the primary alloy in the classification of low carbon and mild steel, and ranges from ____ for mild steel.

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

Explain how a new student may clean a practice weld of tungsten contamination.

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

​What should be done to the end of the filler rod if it becomes oxidized?

Introduction to Welding

Safety in Welding

Shielded Metal Arc Equipment, Setup, and Operation

Shielded Metal Arc Welding of Plate

Shielded Metal Arc Welding of Pipe

Shielded Metal Arc Welding Aws Sense Certification

Flame Cutting

Plasma Arc Cutting

Related Cutting Processes

Gas Metal Arc Welding Equipment, Setup, and Operation

Gas Metal Arc Welding

Flux Cored Arc Welding Equipment, Setup, and Operation

Flux Cored Arc Welding

Gas Metal Arc and Flux Cored Arc Welding of Pipe

Gas Metal Arc and Flux Cored Arc Welding Aws Sense Certification

Gas Tungsten Arc Welding Equipment, Setup, Operation, and Filler Metals

Gas Tungsten Arc Welding of Pipe

Gas Tungsten Arc Welding Plate and Pipe Aws Sense Certification

Shop Math and Weld Cost

Reading Technical Drawings

Welding Joint Design and Welding Symbols

Fabricating Techniques and Practices

Welding Codes and Standards

Testing and Inspection of Welds

Welding Metallurgy

Weldability of Metals

Filler Metal Selection

Welding Automation and Robotics

Other Welding Processes

Oxyfuel Welding and Cutting Equipment, Setup, and Operation

Oxyacetylene Welding

Brazing, Braze Welding, and Soldering

Filters

How can a welder improve the shielding gas coverage of a weld?

What can cause porosity (tiny bubbles) to form on some welds on mild steel?

An oxide layer on aluminum is , while on iron it is .

Why would a welder stick the end of the filler rod in the weld pool as the weld is being stopped?

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

Why would a welder need to make a list of machine settings?

Welds on stainless steel ____________ than welds on mild steel.

When setting up to make a GTA weld on low carbon steel, the tungsten should be and the welding machine set for____.

What should be done to the end of the filler rod if it becomes oxidized?