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Welding Level 2 > Chapter 36 Inspecting and Testing Welds > Flashcards

Chapter 36 Inspecting and Testing Welds Flashcards

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1
Q

What is a flaw or discontinuity?

A

It is a part of a weld that is not perfect.
An imperfection in a weld

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2
Q

What is a defect?

A

A defect is a flaw that makes a weld unsuitable for the job it is intended to perform

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3
Q

The code or specification determines how large a flaw can be before it becomes a defect. In some codes a crack _________ long may be acceptable.

A

1/32”

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4
Q

What is the difference between a nondestructive examination (NDE) and a destructive test?

A

NDE- does not damage the weld or base metal
destructive testing - results in at least some damage to the weld

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5
Q

What is the most typical type of nondestructive examination (NDE)?

A

visual exam

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6
Q

What is a penetrant examination?

A

It is a good means of locating surface flaws. It cannot locate flaws that are inside a weld however, this test used a liquid dye usually red in colour for good visibility of the surface flaw. Fluorescent liquid glows a light green colour and shows the surface flaw.

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7
Q

What is the magnetic particle examination (MT)?

A

It is used to locate the flaw that are at or very near the surface of the weld. Flaws that are deeper within the weld cannot be found using this test. Also this test can only be used on material that are magnetic.

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8
Q

What is the ultrasonic examination (UT)?

A

Can be used on all metals to locate internal flaws. Sound waves are sent into the part being inspected. They travel until they contact air or am internal flaw and are reflected back creating a echo.

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9
Q

What is a radiographic examination (RT)?

A

It is a two-dimensional internal examination method. Two types of radiation can be used to produce radiographic gamma rays and x-rays.

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10
Q

What is a tension test?

A

It is a destructive test that applies a tensile stretching or pulling load to a prepared sample until it breaks.

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11
Q

What is tensile strength?

A

It is a measurement of the amount of force required to pull the metal apart.

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12
Q

What is ductility?

A

A measurement of how much the metal stretches before breaking.

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13
Q

What is the bend test?

A

It is used to evaluate the quality and the ductility of a completed weld. The guided bend test is the most common type.

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14
Q

What are the three classifications of bend tests?

A
  1. The face bend- The weld face is on the outside of the bend
  2. The root bend- Has the weld root side of a weld on the outside of the bend
  3. The side bend- Is used on material that is thicker than 3/8”
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15
Q

What is a transverse sample?

A

A test sample in which the weld runs across the sample

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16
Q

What is a longitudinal sample?

A

A test sample in which the weld runs along the length of the sample

17
Q

How should the weld break if there is good penetration into the base metal and the legs of the weld are equal?

A

It should break along its centerline if there is good penetration.

18
Q

What is a hardness test?

A

These are used to measure a materials resistance to stretching and indentation.

19
Q

What is the peel test?

A

It is used to check the quality of spot welds. One edge of each piece is bent 90 degrees then force is applied to tear the metal apart.

20
Q

What is the pressure test?

A

It is used to determine how much pressure a pipe or cylinder can withstand or test for leaks

21
Q

Who is the first inspector of a weld?

A

The welder

22
Q

Which type of flaws are not detectable using a visual examination (VT)?

A

Internal

23
Q

Penetration examination (PT) cannot detect which of the following flaws?

A

Internal flaws

24
Q

Which of the following types of a non-destructive examination can detect deep internal flaws?

A

Ultrasonic examination (UT)

25
Q

Which of the following types of a non-destructive examination allows for only two-dimensional evaluation of inner flaws?

A

Radiographic examination (RT)

26
Q

Which two type of radiation can be used in radiographic examination?

A

Gamma and x-rays

27
Q

In a guided face bend which part of the specimen ends up on the outward side of the u-shape?

A

Face

Welding Level 2 (21 decks)

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