Material Properties & Inspection Standards Flashcards
7 cards from real NDT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Material Properties & Inspection Standards flashcards as text
What is the primary purpose of radiographic testing (RT) in boiler weld inspection?
Answer: Detect volumetric discontinuities such as porosity and inclusions within the weld
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.
In boiler inspection, 'pitting corrosion' is characterized by:
Answer: Localized attack forming small cavities or pits on the metal surface
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.
What does the Brinell Hardness Number (BHN) test measure?
Answer: The diameter of indentation made by a hardened steel ball under a fixed load
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.
Which document type in an ASME pressure vessel file contains the complete material certifications, NDE reports, and final inspection records?
Answer: Manufacturer's data report (Form U-1)
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.
The term 'heat-affected zone' (HAZ) in a weld refers to:
Answer: The region of base metal adjacent to the weld that was not melted but experienced microstructural changes due to heat
The HAZ is the portion of base metal that was not melted but whose microstructure and properties were altered by the heat of welding.
According to ASME Section V, who is responsible for establishing written NDE procedures?
Answer: The manufacturer or contractor performing the examination
ASME Section V requires the manufacturer or contractor performing NDE to establish, document, and qualify written procedures that meet the applicable code requirements.
What property distinguishes a ferritic steel from an austenitic steel in terms of magnetic behavior?
Answer: Ferritic steels are magnetic; austenitic steels are generally non-magnetic
Ferritic steels have a body-centered cubic (BCC) crystal structure and are ferromagnetic, while austenitic steels have a face-centered cubic (FCC) structure and are generally non-magnetic.