General Chapter 11 Flashcards

Nondestructive Testing

1
Q

Describe the steps involved in a dye penetrant inspection.

A

The surface is cleaned, and then 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 and then developer is applied. The results are then inspected and interpreted.

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2
Q

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

A

A magnifying glass, flashlight, mirror and, possibly, a bore-scope.

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3
Q

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

A

visual, dye penetrant, eddy current, ultrasonic testing and radiography.

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4
Q

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?

A

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

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5
Q

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

A

The bead width should be 3 to 5 times the thickness of the base metal and there must be 100% penetration.

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6
Q

What telltale characteristics are evidence of a cold weld?

A

A cold weld has rough, irregular edges that are not feathered into the base metal and has variations in penetration amounts.

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7
Q

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

A

25 to 50 percent.

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8
Q

Describe the basic steps for conducting a magnetic particle inspections.

A

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.

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