NDT Magnetic Particle Testing Methods 2

Question 1

Which magnetization technique is most effective for detecting longitudinal discontinuities in a cylindrical bar?

Accepted Answer

Circular magnetization using a central conductor

Answer

Circular magnetization creates a magnetic field circumferentially around the part, which is perpendicular to longitudinal discontinuities and maximizes their detection.

Question 2

What is the purpose of the 'residual method' in magnetic particle testing?

Accepted Answer

Applying particles after the magnetizing current is turned off

Answer

The residual method applies particles to a part after magnetization is complete, relying on the retained residual magnetic field to hold particles at discontinuity locations.

Question 3

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

Accepted Answer

While the magnetizing current is flowing

Answer

In the continuous method, magnetic particles are applied while the magnetizing current is actively flowing, taking advantage of the stronger applied field rather than only residual magnetism.

Question 4

A head shot (contact shot) in magnetic particle testing produces which type of magnetization?

Accepted Answer

Circular

Answer

Passing current directly through the part between head contacts creates circular (circumferential) magnetization around the part's cross-section.

Question 5

What is the primary advantage of multidirectional magnetization in magnetic particle testing?

Accepted Answer

Detection of discontinuities in multiple orientations in one operation

Answer

Multidirectional magnetization sequences through different field directions rapidly, allowing detection of variously oriented discontinuities without repositioning the part.

NDT - Non-Destructive Testing Practice Test

NDT - Non-Destructive Testing Practice Test

NDT Magnetic Particle Testing Methods 2