CWI Fundamentals 3

Question 1

Which nondestructive examination (NDE) method is most effective for detecting subsurface volumetric discontinuities in a weld?

Accepted Answer

Radiographic testing (RT)

Answer

Radiographic testing uses X-rays or gamma rays to reveal internal volumetric flaws such as porosity and inclusions throughout the weld cross-section.

Question 2

A weld symbol with a circle at the intersection of the reference line and arrow indicates:

Accepted Answer

A weld all around

Answer

A circle placed at the junction of the reference line and arrow on a weld symbol signifies that the weld is to be made all around the joint.

Question 3

What is the primary purpose of using shielding gas in GMAW?

Accepted Answer

To protect the molten weld pool from atmospheric contamination

Answer

Shielding gas in GMAW surrounds the arc and weld pool to prevent oxygen, nitrogen, and moisture from contaminating the molten metal.

Question 4

In the context of welding procedure qualification, what does 'essential variable' mean?

Accepted Answer

A variable whose change requires re-qualification of the welding procedure

Answer

An essential variable is one whose change beyond specified limits is considered to affect the mechanical properties and requires re-qualification of the WPS.

Question 5

Which destructive test is used to evaluate the ductility and soundness of a weld by bending the specimen?

Accepted Answer

Guided bend test

Answer

The guided bend test bends a weld specimen around a mandrel to a specified angle, revealing lack of fusion, cracks, or porosity on the tension surface.

CWI Practice Test

CWI Practice Test

CWI Fundamentals 3