Inspection And Techniques

Question 1

What is the proper type of nondestructive inspection to use for location surface cracks in an aluminum alloy casting for 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 material’s resonant frequency. Comparing the resonant frequency of a known sound material with the material under the test will indicate the presence of a fault.

Question 3

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

Answer 3

Clean the part thoroughly, apply penetrant, and allow it to soak for the recommended dwell time. Remove all of the penetrant from the surface and apply the developer.