Nondestructive Examination Methods Flashcards

What is the primary limitation of liquid penetrant testing (PT)?

Answer: It is limited to surface-breaking discontinuities only

PT relies on capillary action and can only detect discontinuities that are open to the surface.

In ultrasonic shear wave testing, the refracted shear wave angle is produced using which principle?

Answer: Snell's Law

Snell's Law describes the relationship between the incident angle and the refracted wave angle at a material interface.

A CWI is reviewing a radiograph and sees a dark, elongated linear indication with fuzzy edges. This is most likely caused by:

Answer: Slag inclusion

Slag inclusions typically appear as dark, elongated indications with irregular or fuzzy edges on a radiograph.

When using the wet continuous method of magnetic particle testing, the particles are applied:

Answer: While the magnetizing current is flowing

In the wet continuous method, particles are applied while the magnetizing current is flowing to maximize particle mobility and indication formation.

What does the term 'impedance plane' refer to in eddy current testing?

Answer: A graphical display showing the relationship between resistance and inductive reactance

The impedance plane is a 2D display (X vs. Y) that plots the resistive and reactive components of the probe's impedance to characterize material conditions.

For radiographic testing, the geometric unsharpness (Ug) is increased by:

Answer: Decreasing object-to-film distance

Geometric unsharpness increases when the object-to-film distance increases or when source-to-film distance decreases.

During visual inspection of a completed fillet weld, a CWI notices the weld face is concave. The primary concern is:

Answer: Reduced throat dimension and load-carrying capacity

A concave fillet weld face reduces the effective throat, which reduces the weld's load-carrying capacity.