CWI Fundamentals Tech 4

Question 1

What does the acronym 'HAZ' stand for in welding metallurgy?

Accepted Answer

Heat-Affected Zone

Answer

The Heat-Affected Zone (HAZ) is the area of base metal whose microstructure and properties have been altered by welding heat without melting.

Question 2

Which nondestructive examination method is best suited for detecting subsurface planar discontinuities in a weld?

Accepted Answer

Ultrasonic testing (UT)

Answer

Ultrasonic testing (UT) can detect subsurface discontinuities including planar flaws like lack of fusion and cracks.

Question 3

What is the purpose of the 'essential variable' concept in welding procedure qualification?

Accepted Answer

To identify parameters whose change requires requalification of the WPS

Answer

Essential variables are those parameters whose change could affect the mechanical properties of the weld, requiring the WPS to be requalified.

Question 4

In radiographic testing, a higher density (darker area) on a film indicates the presence of:

Accepted Answer

Less material or void-type discontinuities

Answer

Darker (higher density) areas on RT film indicate less material for radiation to penetrate, suggesting voids, porosity, or cracks.

Question 5

Which of the following is considered an 'unacceptable' weld profile condition per AWS D1.1?

Accepted Answer

Overlap (cold lap) at the weld toe

Answer

Overlap (cold lap) is unacceptable because it creates a notch at the weld toe that can initiate fatigue cracks without proper fusion.

CWI Practice Test