PRINCIPLES OF SOUND
Sound is a form of mechanical energy that travels in a longitudinal wave in a series of compressions (high pressure) and rarefactions (low pressure). The transmission of sound requires a…
Measuring Magnetic Fields
When performing a magnetic particle inspection, it is very important to be able to determine the direction and intensity of the magnetic field. As discussed previously, the direction of the…
Quantifying Magnetic Properties
(Magnetic Field Strength, Flux Density, Total Flux and Magnetization) Until now, only the qualitative features of the magnetic field have been discussed. However, it is necessary to be able to measure…
Sensitivity in Magnetic Particle testing
It is common to see the term ‘crack-free’ used in product specifications and although the concept may be simple to understand, it is too wide and ambiguous.Testing magnetic particles not…
MAGNETIC PARTICLE INSPECTION
MAGNETIZES TO FIND DISCONTINUITIES Magnetic particle inspection successfully detects surface and near surface defects in ferromagnetic materials such as steel and iron. This is just one type of nondestructive testing…
Magnetic Field Characteristics
Magnetic Field In and Around a Bar Magnet As discussed previously, a magnetic field is a change in energy within a volume of space. The magnetic field surrounding a bar…
Magnetic Domains
Ferromagnetic materials get their magnetic properties not only because their atoms carry a magnetic moment but also because the material is made up of small regions known as magnetic domains.…
Diamagnetic, Paramagnetic, and Ferromagnetic Materials
When a material is placed within a magnetic field, the magnetic forces of the material's electrons will be affected. This effect is known as Faraday's Law of Magnetic Induction. However,…
Magnetization of Ferromagnetic Materials
There are a variety of methods that can be used to establish a magnetic field in a component for evaluation using magnetic particle inspection. It is common to classify the…
Principle of Magnetic Particle Testing
Principle of MPT This testing method is called MT (Magnetic Testing) or MPT (Magnetic Particle Testing), and suitable for the surface / subsurface flaw inspection of ferromagnetic materials.Principle of MPT…
