CWI Ultimate Review 5

Question 1

In liquid penetrant testing (PT), what is the function of the developer?

Accepted Answer

To draw trapped penetrant out of discontinuities and provide a contrasting background

Answer

The developer draws (blots) the penetrant out of discontinuities by capillary action and provides a contrasting background to make indications visible.

Question 2

What does a 'hot crack' (solidification crack) in a weld typically look like on a radiograph?

Accepted Answer

A straight or branching line following the weld centerline

Answer

Solidification (hot) cracks typically appear as straight or slightly jagged lines following the weld centerline on a radiograph, as they form during solidification in the center of the weld pool.

Question 3

Which of the following base metals is classified as P-Number 1 in ASME Section IX?

Accepted Answer

Carbon steel (A36)

Answer

ASME Section IX P-Number 1 covers carbon steels such as A36, A53, and similar materials with low carbon content and good weldability.

Question 4

A CWI measuring weld reinforcement finds it to be 5/32 in (4.0 mm) on a 3/8 in (9.5 mm) butt weld. Per AWS D1.1, this is:

Accepted Answer

Rejectable; the maximum reinforcement for this thickness is 1/8 in

Answer

AWS D1.1 limits weld face reinforcement to 1/8 in (3.2 mm) maximum for groove welds in base metal up to and including 3/4 in thick, so 5/32 in exceeds this limit.

Question 5

Overlap (cold lap) in a weld is caused by:

Accepted Answer

Weld metal flowing beyond the fusion zone onto the base metal surface without fusing

Answer

Overlap occurs when weld metal flows over the base metal surface and solidifies without achieving fusion, typically caused by too low a current, too slow a travel speed, or incorrect electrode angle.

CWI Practice Test

CWI Practice Test

CWI Ultimate Review 5