Non Destructive Testing

Question 1

What is the proper type of nondestructive inspection to use for locating surface cracks in an aluminum alloy casting or forging?

Answer 1

Fluorescent or visual dye penetrant.

Question 2

What is the principle upon which ultrasonic inspection is based?

Answer 2

Any fault within a material will change the materials resonant frequency.

Question 3

What is the procedure when making a dye penetrant inspection of a part?

Answer 3

Clean the part, apply penetrant, allow it to soak, remove the penetrant, and apply the developer.