CWI Destructive Testing and Properties 5

Question 1

A peel test is most commonly used to evaluate:

Accepted Answer

Fusion in resistance spot welds or small-diameter fillet welds

Answer

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.

Question 2

During a Brinell hardness test, the hardness number (BHN) is calculated using the applied load and:

Accepted Answer

The surface area of the spherical indentation

Answer

The BHN is the applied load divided by the curved surface area of the spherical indentation produced by the ball indenter.

Question 3

What type of fracture surface appearance in a nick-break test indicates good weld quality?

Accepted Answer

Fine-grained, silky appearance with no cracks, voids, or excessive slag

Answer

An acceptable nick-break fracture exhibits a fine-grained, dense surface free of cracks, incomplete fusion, porosity exceeding code limits, or excessive slag inclusions.

Question 4

Which test method is used to determine the transition temperature between ductile and brittle fracture behavior in steel?

Accepted Answer

Charpy V-notch impact testing at multiple temperatures

Answer

Charpy impact tests conducted across a range of temperatures generate a ductile-to-brittle transition curve used to determine the transition temperature.

Question 5

What is the minimum acceptable bend angle for most AWS D1.1 guided bend qualification tests?

Accepted Answer

180 degrees

Answer

AWS D1.1 requires that bend specimens be bent to 180 degrees (U-shape) without cracks exceeding specified limits on the tension surface.

CWI Practice Test

CWI Practice Test

CWI Destructive Testing and Properties 5