Question 1

The amount of concavity in a root surface can be given as ____.

Accepted Answer

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

Question 2

Which of the following is a cause of contamination of the back side of the molten weld pool?

Accepted Answer

A)   Failure to remove the root edge
B)   Insufficient heat, insufficient filler metal
C)   Overheating, poor cleaning procedures
D)   Excessive root reinforcement

Question 3

Failure to remove the root edge may result in ____.

Accepted Answer

A)   porosity
B)   poor penetration
C)   a concave root surface
D)   grapes

Question 4

Whether the root of the weld has excessive root reinforcement can be determined by ____.

Accepted Answer

A)   visual inspection
B)   x-ray testing
C)   cutting a cross-section of the weld
D)   destructive testing

Question 5

Most codes and standards for GTA pipe welding require no more than ____ inch of root reinforcement.

Accepted Answer

A)   1/16
B)   3/32
C)   1/8
D)   1/4

Question 6

A concave root surface is sometimes known as ____________________.

Accepted Answer

The answer of A concave root surface is sometimes known...

Question 7

​When would GTA welding be a good choice for making pipe welds?

Accepted Answer

A)   ​When the joint must have a high degree of integrity.
B)   ​If the joint has too narrow of a root gap.
C)   ​If the joint has too wide of a root gap.
D)   ​For 6G pipe joints and when pipe flanges are being installed at the ends of pipe runs.

Question 8

Describe the specifications of the stringer bead used to cap the weld in a cover pass.

Accepted Answer

The stringer bead can be continued to ca...

Question 9

​What does making deep penetration on the filler passes do?

Accepted Answer

A)   ​It makes sure that there is complete fusion between all of the weld passes.
B)   ​It eliminates overlap along the sides of the weld.
C)   ​It can cause burnthrough.
D)   ​It subjects the pipe to more heat than needed.

Question 10

Incomplete fusion can be detected by ____.

Accepted Answer

A)   an x-ray
B)   a root bend test
C)   visual inspection
D)   cutting a cross-section of the weld

Question 11

Excessive root reinforcement can cause reduced material flow, result in clogged pipes, or form ____________________ that will result in premature weld failure.

Accepted Answer

The answer of Excessive root reinforcement can cause reduced material...

Question 12

____ result(s)  from excessive heat, temperature, and filler metal during welding.

Accepted Answer

A)   Porosity
B)   Grapes
C)   Suck back
D)   Incomplete penetration

Question 13

Explain how to compute the flow time necessary for backing gas to purge a pipe of air.

Accepted Answer

First, estimate the interior volume of t...

Question 14

____ can result in premature cracking or failure of the weld at a load well under its expected strength.

Accepted Answer

A)   Porosity
B)   Contamination
C)   Stress points
D)   Oxidization

Question 15

​Why are the ends of tack welds ground to a featheredge?

Accepted Answer

A)   ​To make it easier to see as you weld across the tack welds.
B)   ​It prevents the shielding gas from becoming turbulent and losing good gas coverage.
C)   ​It stops porosity.
D)   ​To make it easier to have 100% penetration at the ending and beginning of the root weld.

Question 16

​Which of the following is not a way of cleaning the band around the end of a pipe for welding?

Accepted Answer

A)   ​grinding
B)   ​brushing
C)   ​filing
D)   ​soap and water D

Question 17

The ____________________ of the root surface results in reduced thickness of the weld.

Accepted Answer

The answer of The ____________________ of the root surface results...

Question 18

____ help to reduce the number of repairs or rejections when welding under less than ideal conditions, such as in a limited space.

Accepted Answer

A)   Consumable inserts
B)   Tack welds
C)   Backing strips
D)   Preplaced filler rods A

Question 19

​What is an advantage of bending the welding rod to the radius of the pipe?

Accepted Answer

A)   ​It makes the rod easier to hold and less likely to slip in the welder's gloved hand.
B)   ​That way when the weld is stopped it is easier to see which end of the rod might be hot.
C)   ​It allows the rod to be held at a closer angle to the pipe to minimize contamination.
D)   ​It covers the joint to help to prevent incomplete fusion caused by the loss of the backing gas. C

Question 20

​What might affect the selection of the type of groove preparation on the end of a pipe?

Accepted Answer

A)   ​pipe material
B)   ​pipe application
C)   ​pipe thickness
D)   ​All of the above

Exam 18: Gas Tungsten Arc Welding of Pipe

The amount of concavity in a root surface can be given as ____.

Correct AnswerverifiedShow Answer

Which of the following is a cause of contamination of the back side of the molten weld pool?

Correct AnswerverifiedShow Answer

Failure to remove the root edge may result in ____.

Correct AnswerverifiedShow Answer

Whether the root of the weld has excessive root reinforcement can be determined by ____.

Correct AnswerverifiedShow Answer

Most codes and standards for GTA pipe welding require no more than ____ inch of root reinforcement.

Correct AnswerverifiedShow Answer

A concave root surface is sometimes known as ____________________.

Correct AnswerverifiedShow Answer

​When would GTA welding be a good choice for making pipe welds?

Correct AnswerverifiedShow Answer

Describe the specifications of the stringer bead used to cap the weld in a cover pass.

Correct AnswerverifiedThe stringer bead can be continued to ca...View AnswerShow Answer

​What does making deep penetration on the filler passes do?

Correct AnswerverifiedShow Answer

Incomplete fusion can be detected by ____.

Correct AnswerverifiedShow Answer

Excessive root reinforcement can cause reduced material flow, result in clogged pipes, or form ____________________ that will result in premature weld failure.

Correct AnswerverifiedShow Answer

____ result(s) from excessive heat, temperature, and filler metal during welding.

Correct AnswerverifiedShow Answer

Explain how to compute the flow time necessary for backing gas to purge a pipe of air.

Correct AnswerverifiedFirst, estimate the interior volume of t...View AnswerShow Answer

____ can result in premature cracking or failure of the weld at a load well under its expected strength.

Correct AnswerverifiedShow Answer

​Why are the ends of tack welds ground to a featheredge?

Correct AnswerverifiedShow Answer

​Which of the following is not a way of cleaning the band around the end of a pipe for welding?

Correct AnswerverifiedD

The ____________________ of the root surface results in reduced thickness of the weld.

Correct AnswerverifiedShow Answer

____ help to reduce the number of repairs or rejections when welding under less than ideal conditions, such as in a limited space.

Correct AnswerverifiedA

​What is an advantage of bending the welding rod to the radius of the pipe?

Correct AnswerverifiedC

​What might affect the selection of the type of groove preparation on the end of a pipe?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

When would GTA welding be a good choice for making pipe welds?

Correct Answer
verified

Correct Answer
verified
The stringer bead can be continued to ca...
View Answer

What does making deep penetration on the filler passes do?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
First, estimate the interior volume of t...
View Answer

Correct Answer
verified

Why are the ends of tack welds ground to a featheredge?

Correct Answer
verified

Which of the following is not a way of cleaning the band around the end of a pipe for welding?

Correct Answer
verified
D

Correct Answer
verified

Correct Answer
verified
A

What is an advantage of bending the welding rod to the radius of the pipe?

Correct Answer
verified
C

What might affect the selection of the type of groove preparation on the end of a pipe?

Correct Answer
verified