CWI Practical Visual Inspection 5

Question 1

What is the maximum visual inspection distance specified by most codes for direct visual examination?

Accepted Answer

24 inches (600 mm)

Answer

Most codes, including AWS D1.1, limit direct visual examination to a maximum distance of 24 inches (600 mm) from the examination surface.

Question 2

A CWI finds a crater crack at the end of a weld bead. What is the most common cause of this type of crack?

Accepted Answer

Rapid solidification and shrinkage of the molten pool when the arc is abruptly stopped

Answer

Crater cracks form when the arc is stopped abruptly, causing the unfilled crater to shrink and crack during rapid solidification.

Question 3

When inspecting the fit-up of a butt joint before welding, the CWI should verify that the root opening is:

Accepted Answer

Within the tolerances specified by the WPS and applicable code

Answer

Root opening must be within the tolerances of the approved WPS and code, as too little or too much opening affects penetration and fit-up quality.

Question 4

A weld inspector notices that a welder has been welding without the specified preheat. What should the inspector do?

Accepted Answer

Stop welding immediately and require preheat to be established before continuing

Answer

Preheat is a mandatory WPS requirement; if it is not being maintained, welding must stop immediately until the required temperature is established.

Question 5

Which visual inspection technique is specifically used to detect surface-breaking discontinuities that are difficult to see with the naked eye by flooding the weld with light at a low angle?

Accepted Answer

Raking (oblique) lighting technique

Answer

Raking or oblique lighting casts shadows from even small surface irregularities, making fine surface-breaking cracks and discontinuities more visible.

CWI Practice Test

CWI Practice Test

CWI Practical Visual Inspection 5