What is a magnetic yoke?

A magnetic Yoke is a portable device for detecting surface and sub-surface cracking in any ferro-magnetic material.

How does a magnetic yoke work?

Description: A magnet that induces a magnetic field in the area of a part that lies between the poles. Yokes may be permanent magnets or electromagnets. Permanent Magnet Yoke – A body which possesses the ability to retain or hold a large amount of the applied magnet field after the active power of the field is removed.

What is the principle of MPT?

Principle of MPT is as follows: When the workpiece to be inspected is magnetized, magnetic flux is induced. If there is a flaw on the surface, magnetic flux leaks into the air at the position of the flaw. Then magnetic particles (dyed or fluorescent encapsulated) are applied to the surface.

What is a magnetic particle test used for?

Magnetic Particle Testing (MPT), also referred to as Magnetic Particle Inspection, is a nondestructive examination (NDE) technique used to detect surface and slightly subsurface flaws in most ferromagnetic materials such as iron, nickel, and cobalt, and some of their alloys.

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What is electromagnetic inspection?

Electromagnetic testing (ET), as a form of nondestructive testing, is the process of inducing electric currents or magnetic fields or both inside a test object and observing the electromagnetic response. If the test is set up properly, a defect inside the test object creates a measurable response.

When would you use the coil to magnetize?

The use of coils and solenoids is a third method of indirect magnetization. When the length of a component is several times larger than its diameter, a longitudinal magnetic field can be established in the component.

Is standard for magnetic particle inspection?

Magnetic particle users outside the aerospace industry have typically used ASTM E709 Standard Guide for Magnetic Particle Testing as their baseline standard for procedures. ASME, AWS, and API standards all use ASTM E709 as a reference to build their specific requirements.

What is MPT in NDT?

Magnetic particle testing, or MPT, is a very sensitive, nondestructive testing method used on rigid materials like iron, cobalt, nickel and their alloys. It’s one of the fastest, most cost-efficient ways to ensure that critical elements like pipes or pipe welds are safe and ready to be used.

What materials can you use for magnetic particle inspection?

Because this method relies on a magnetic field to produce results, it works best on ferrous materials, like nickel, iron, cobalt, and some alloys. Components like billets, bars, castings, forgings, fasteners, weldments and extrusions are also commonly tested using magnetic particle inspection.

Can you magnetic particle inspect stainless steel?

It is true that you can perform mag particle testing on ferritic stainless steels. The easiest method of determining if the material can be mag particle inspected is to see if a permanent magnet is attracted to it. The three elements which are ferromagnetic are iron, nickel and cobalt.

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Can MPI be done on painted surface?

The thicker the paint, the less sensitive the test. That being said, magnetic particle testing over paint can work very well. Magnaflux even makes contrast paint to be used with magnetic particle testing.

What are the limitations of magnetic particle inspection?

Disadvantages of the Magnetic Particle method of Non-Destructive Examination are: It is restricted to ferromagnetic materials – usually iron and steel, and cannot be used on austenitic stainless steel. It is messy. Most methods need a supply of electricity.

How do you test for electromagnetism?

Scrape the enamel insulation off the ends of the coil wires for connection to jumper leads, then connect the coil to a battery. When electric current goes through the coil, it will produce a strong magnetic field: one “pole” at each end of the rod. This phenomenon is known as electromagnetism.

What is NDT testing?

NDT stands for Non-Destructive Testing. It refers to an array of inspection methods that allow inspectors to evaluate and collect data about a material, system, or component without permanently altering it.

What are the advantages of eddy current?

The advantages of eddy current testing are: Sensitivity to surface defects. Able to detect defects of 0.5mm in length under favourable conditions. Can detect through several layers.

A magnetic field