Destructive Testing and Properties Flashcards
7 cards from real CWI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Destructive Testing and Properties flashcards as text
A peel test is most commonly used to evaluate:
Answer: Fusion in resistance spot welds or small-diameter fillet welds
The peel test is used for thin sheet resistance spot welds and small fillet welds to evaluate nugget size or fusion at the root by peeling apart joined pieces.
During a Brinell hardness test, the hardness number (BHN) is calculated using the applied load and:
Answer: The surface area of the spherical indentation
The BHN is the applied load divided by the curved surface area of the spherical indentation produced by the ball indenter.
What type of fracture surface appearance in a nick-break test indicates good weld quality?
Answer: Fine-grained, silky appearance with no cracks, voids, or excessive slag
An acceptable nick-break fracture exhibits a fine-grained, dense surface free of cracks, incomplete fusion, porosity exceeding code limits, or excessive slag inclusions.
Which test method is used to determine the transition temperature between ductile and brittle fracture behavior in steel?
Answer: Charpy V-notch impact testing at multiple temperatures
Charpy impact tests conducted across a range of temperatures generate a ductile-to-brittle transition curve used to determine the transition temperature.
What is the minimum acceptable bend angle for most AWS D1.1 guided bend qualification tests?
Answer: 180 degrees
AWS D1.1 requires that bend specimens be bent to 180 degrees (U-shape) without cracks exceeding specified limits on the tension surface.
Modulus of elasticity (Young's modulus) is determined from the tensile test as:
Answer: The slope of the linear elastic region of the stress-strain curve
Young's modulus is the ratio of stress to strain in the elastic (linear) region of the stress-strain curve, representing material stiffness.
In a transverse weld tensile test, if the specimen breaks in the base metal at a stress exceeding the minimum specified tensile strength, the test result is:
Answer: Accepted because the minimum strength requirement was met
A base metal fracture above the minimum specified tensile strength demonstrates the weld is at least as strong as the base metal, which is acceptable.