Chapter 11 - Nondestructive Testing - Oral Questions

Question 1

Describe the steps involved in a dye penetrant inspection

Answer 1

Surface is cleaned, penetrant is applied and allowed to dwell for a specified time.

The penetrant is then removed with an emulsifier or cleaner.

Once removed, the part is dried then developer is applied.

The results are then inspected.

Question 2

Name some tools that are commonly used to assist in making visual inspections of welds

Answer 2

Magnifying glass, flashlight, mirror and possibly a borescope

Question 3

What are some of the non-destructive testing methods that may be used on aluminum parts?

Answer 3

Visual,

dye penetrant,

eddy current,

ultrasonic testing and

radiography.

Question 4

What process occurs during the preparation stage of a dye penetrant inspection when the penetrating liquid is applied, and then removed from a cracked part?

Answer 4

The penetrant enters the crack by capillary action and remains there until made visible by the developer

Question 5

A correctly made butt weld will have what bead width and how much penetration?

Answer 5

Bead width should be 3 to 5 times the thickness of the base metal, and there must be 100 % penetration

Question 6

What are evidence of a cold weld?

Answer 6

Rough, irregular edges that are not feathered into the base metal and has variations in penetration amounts

Question 7

The penetration of a fillet weld should be what percentage of the thickness of the base metal

Answer 7

25 to 50 percent

Question 8

Describe the basic steps for conducting a magnetic particle inspections

Answer 8

Magnetize the part, then coat the surface with ferromagnetic particles.

If a defect or discontinuity is present, the particles align with the discontinuity forming a visible pattern