NDT Material Properties & Inspection Standards 5

Question 1

What is the primary purpose of radiographic testing (RT) in boiler weld inspection?

Accepted Answer

Detect volumetric discontinuities such as porosity and inclusions within the weld

Answer

RT uses X-ray or gamma radiation to reveal internal volumetric discontinuities (porosity, slag inclusions, lack of fusion) as density variations on film or digital detector.

Question 2

In boiler inspection, 'pitting corrosion' is characterized by:

Accepted Answer

Localized attack forming small cavities or pits on the metal surface

Answer

Pitting corrosion creates localized cavities that penetrate deep into the metal while the surrounding surface remains relatively unaffected, making it particularly dangerous in pressure equipment.

Question 3

What does the Brinell Hardness Number (BHN) test measure?

Accepted Answer

The diameter of indentation made by a hardened steel ball under a fixed load

Answer

The Brinell test applies a fixed load to press a hardened steel ball into the material surface, then calculates hardness from the ratio of load to the curved area of the indentation.

Question 4

Which document type in an ASME pressure vessel file contains the complete material certifications, NDE reports, and final inspection records?

Accepted Answer

Manufacturer's data report (Form U-1)

Answer

The ASME Manufacturer's Data Report (Form U-1) is the official document certifying that the vessel was manufactured and inspected in accordance with ASME Section VIII requirements.

Question 5

The term 'heat-affected zone' (HAZ) in a weld refers to:

Accepted Answer

The region of base metal adjacent to the weld that was not melted but experienced microstructural changes due to heat

Answer

The HAZ is the portion of base metal that was not melted but whose microstructure and properties were altered by the heat of welding.

(NDT) Boilermaker Nondestructive Testing Certification Practice Test

(NDT) Boilermaker Nondestructive Testing Certification Practice Test

NDT Material Properties & Inspection Standards 5