Magnetic testing refers to the procedure for detecting the ability of elements to draw to magnetic forces. The materials are considered ferromagnetic, which means they exhibit magnetic qualities. Mag particle testing has wider applications in detecting cracks on industrial machinery or concrete buildings. Non destructive testing like the name suggests is done without disturbing the structure of concrete buildings, for example. Examples of naturally occurring elements that are ferromagnetic are, nickel, iron and cobalt. Gadolinium, a rare metal is another example. All these elements are found in groups 3-12 of the periodic table. They have got a specific thing in common; these are all alloys.
Before magnetic testing is carried out, testing particles are coated and colored. This is done to make them visible while observed under ultraviolet light. Direct currents are then transferred on the part under testing. Structural engineers or technicians then use mag particle testing apparatus to identify areas with cracks. To identify a crack, the engineer focuses on where the particles are centered. Other equipment is used to capture images of the damaged section. These are sent to a main computer system for further analysis. This kind of a test normally takes anywhere between 6 and 8 hours. Factories that deal in the manufacture of steel make use of this method so much.
Engine block cracks are tough to detect. A minute crack may not be visible with a naked eye. The cracks can lead to overheating of an engine. Ultimately such an engine could fail totally. Dry mag particle testing helps pinpoint where such cracks are. A technician widely spreads powder on the engine block. Using an electromagnetic equipment, a magnetic field is created. Through the field's contact with the metal and testing powder, a crack is depicted through uneven patterns like shadows or lines. Cast iron blocks provide the best materials for magnetic testing.
Non destructive testing on concrete is done soon after the hardening of a block or beam. The testing check for strength, density and hardness. It is also easy to detect cracks. City engineers may use techniques like radar to test for cracks on suspension bridges. Magnetic testing might use various techniques but the same concept is applicable. The equipment used range from hand held devices to massive machines. Apart from industries, the procedure is also used by X-ray laboratories. Concrete structures are uncomplicated and testing can be done using visual aids such as cameras, night vision goggles and magnifying glasses.
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Ways To Magnetic Particle Examination
Magnetic particle examination only applies to ferromagnetic materials such as iron, cobalt, nickel, and their alloys. This is necessary so that they can get magnetized by the magnetic particle tester
Appliances Utilized In Non Destructive Testing
Magnetic testing equipment can be customized depending on the type of application. Small industrial users can use them intact. Where mass production of ferroelectric materials takes place, mag particle testing machines can be custom built to suit those needs.
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Non destructive testing (NDT) is a very popular material and equipment testing method. There are several NDT methods, the most popular being the magnetic particle inspection
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