(8)

Question 1

Three basic steps of interpreting radiographs:

Answer 1

1. detection
2. interpretation
3. evaluation

Question 2

Detection

Answer 2

• knowledge of expected discontinuities
• experience
• viewing conditions

Question 3

Interpretation

Answer 3

Judging an indication as to its cause and nature

Question 4

Evaluation

Answer 4

will the discontinuity have an effect on the intended use of the part?
- use of standards, codes and specifications

Question 5

Types of discontinuities

Answer 5

• Inherent
• Processing
• Welding
• In-service

Question 6

Inherent Discontinuities

Answer 6

metal going from liquid to solid

Question 7

Processing Discontinuities

Answer 7

from primary processing (rolling, drawing, extruding, forging)

from secondary processing (heat treat, machining, grinding, plating, etching)

Question 8

Welding Discontinuities

Answer 8

From the joining of two surfaces by heat and pressure.

Question 9

In-Service Discontinuities

Answer 9

Direct result of continued use of over-use of the part.

Question 10

Inherent Casting Discontinuity examples

Answer 10

• shrinkage
• shrinkage cavities
• porosity/blowholes
• inclusions
• crack and hot tears

Question 11

Welding Discontinuity examples

Answer 11

• porosity
• slag
• incomplete penetration
• undercut
• incomplete fusion
• cracks

Question 12

Inclusion categories

Answer 12

• slag
• oxide
• tungsten