Question 1

After the bevel has been cut, the root face is created by ____.

Accepted Answer

A)   the bevel itself
B)   grinding or machining the root edge
C)   cutting a suitable gap in the pipe
D)   cutting a U-groove

Question 2

Two of the most common root defects are ____.

Accepted Answer

A)   porosity and slag inclusions
B)   slag inclusions and suck back
C)   grapes and porosity
D)   incomplete fusion and concave root surface

Question 3

In preparing the pipe for welding, the pipe should be tack welded together with a root opening of ____ inch.

Accepted Answer

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

Question 4

Define concave root surface and list its common causes and consequences.

Accepted Answer

A concave root surface (suck back) occur...

Question 5

The end of the pipe is prepared with a bevel, leaving a root face of ____ inch.

Accepted Answer

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

Question 6

The easiest method of protecting the root from atmospheric contamination is to use a(n) ____________________.

Accepted Answer

The answer of The easiest method of protecting the root...

Question 7

Before the joint is assembled, to remove any sources of contamination, clean a ____ inch wide or wider band, both inside and outside of the pipe.

Accepted Answer

A)   one half
B)   one
C)   one and a half
D)   two

Question 8

​What can be done to prevent the backing gas from being blown through the joint?

Accepted Answer

A)   ​Turn down the flow rate on the backing gas.
B)   ​Make longer tack welds to seal more of the joint opening before starting to weld.
C)   ​Put tape over the joint.
D)   ​Use a larger diameter nozzle and higher shielding flow rate to compensate for the loss.

Question 9

Most codes and standards for GTA pipe welding require ____ percent root penetration.

Accepted Answer

A)   90
B)   95
C)   98
D)   100

Question 10

To purge the air out of a 10 foot section of 6 inch diameter pipe, if the flow rate is 20 cfh, the flow time will be approximately ____.

Accepted Answer

A)   3 minutes
B)   6 minutes
C)   7 minutes
D)   9 minutes

Exam 18: Gas Tungsten Arc Welding of Pipe

The easiest method of protecting the root from atmospheric contamination is to use a(n) ____________________.

Correct Answer
verified

Define concave root surface and list its common causes and consequences.

Correct Answer
verified
A concave root surface (suck back) occur...
View Answer

Before the joint is assembled, to remove any sources of contamination, clean a ____ inch wide or wider band, both inside and outside of the pipe.

Correct Answer
verified

Two of the most common root defects are ____.

Correct Answer
verified

Most codes and standards for GTA pipe welding require ____ percent root penetration.

Correct Answer
verified

The end of the pipe is prepared with a bevel, leaving a root face of ____ inch.

Correct Answer
verified

What can be done to prevent the backing gas from being blown through the joint?

Correct Answer
verified

After the bevel has been cut, the root face is created by ____.

Correct Answer
verified

In preparing the pipe for welding, the pipe should be tack welded together with a root opening of ____ inch.

Correct Answer
verified

To purge the air out of a 10 foot section of 6 inch diameter pipe, if the flow rate is 20 cfh, the flow time will be approximately ____.

Correct Answer
verified

Exam 18: Gas Tungsten Arc Welding of Pipe

The easiest method of protecting the root from atmospheric contamination is to use a(n) ____________________.

Correct AnswerverifiedShow Answer

Define concave root surface and list its common causes and consequences.

Correct AnswerverifiedA concave root surface (suck back) occur...View AnswerShow Answer

Before the joint is assembled, to remove any sources of contamination, clean a ____ inch wide or wider band, both inside and outside of the pipe.

Correct AnswerverifiedShow Answer

Two of the most common root defects are ____.

Correct AnswerverifiedShow Answer

Most codes and standards for GTA pipe welding require ____ percent root penetration.

Correct AnswerverifiedShow Answer

The end of the pipe is prepared with a bevel, leaving a root face of ____ inch.

Correct AnswerverifiedShow Answer

​What can be done to prevent the backing gas from being blown through the joint?

Correct AnswerverifiedShow Answer

After the bevel has been cut, the root face is created by ____.

Correct AnswerverifiedShow Answer

In preparing the pipe for welding, the pipe should be tack welded together with a root opening of ____ inch.

Correct AnswerverifiedShow Answer

To purge the air out of a 10 foot section of 6 inch diameter pipe, if the flow rate is 20 cfh, the flow time will be approximately ____.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
A concave root surface (suck back) occur...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What can be done to prevent the backing gas from being blown through the joint?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified