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NDT Testing




   

NDT (NON-Destructive Test)

Nondestructive testing (NDT) is the process of inspecting, testing, or evaluating materials, components or assemblies for discontinuities, or differences in characteristics without destroying the serviceability of the part or system. In other words, when the inspection or test is completed the part can still be used. In contrast to NDT, other tests are destructive in nature and are therefore done on a limited number of samples rather than on the materials, components or assemblies actually being put into service. These destructive tests are often used to determine the physical properties of materials such as impact resistance, ductility, yield and ultimate tensile strength, fracture toughness and fatigue strength, but discontinuities and differences in material characteristics are more effectively found by NDT.

NDT IN CONCRETE

REBOUMD HAMMER TEST

NBML offers the precise, accurate & reliable Rebound Hammer testing complying the requirement of (IS 516 pt.4/Sec.1 2020).the Rebound Hammer is designed to carry out instant non-destructive test on concrete structure without damage and gives an immediate indication of the compressive strength of the concrete.

Objective of Test:

Rebound Hammer test could be used for:-
Assessing the likely compressive strength of concrete with the help of suitable correlation between rebound index and compressive strength.
Assessing the uniformity of concrete.
Assessing the quality of the concrete in relation to the standard requirements.
Assessing the quality of one element of concrete in relation to another.

ULTRASONIC PULSE VELOCITY

NBML offers the precise, accurate & reliable Ultrasonic Pulse Velocity test complying the requirement of IS 516 pt.5/sec.1 2018) UPV method is particularly effective, powerful, flexible, allowing in depth analysis. UPV in necessary to determine concrete uniformity, to control its quality, to follow up the deterioration, to check their presence of internal flaws and voids

Objective of Test:

Ultrasonic Pulse Velocity test could be used for:
The homogeneity of the concrete.
The presence of cracks, voids and other imperfections.
Changes in the structure of the concrete which may occur with time.
The quality of concrete in relation to standard requirements.
The quality of one element of concrete in relation to another.
The values of dynamic elastic modulus of the concrete.

CARBONATION TEST

NBML offers the precise, accurate& reliable Carbonation test Accredited by NABL complying the requirement of:-

What is Carbonation?

Carbonation occurs in Concrete becausethe calcium bearing phases present are attacked by carbon dioxide of the airand converted to calcium carbonate.Cement paste contains 25-50 % calcium hydroxide Ca(OH)2, which mean that the pH of the fresh cement paste is at least 12.5.

Objective of Test:

The phenolphthalein test method is intended to measure the depth of the carbonated layer near the surface of hardened concrete. It is not suitable for concrete made with calcium aluminate cement. It may be used on site or in the laboratory, on test specimens or on cores or fragments removed from hardened concrete structures.



NDT IN METAL

ULTRASONIC TESTING

Ultrasonic Testing is the process of transmitting high-frequency sound waves into a material in order to detect changes in the material's properties. Ultrasonic Testing uses sound waves to detect defects or flaws inside material. These sound waves travel through the material with some energy loss (attenuation) and are reflected and refracted at interfaces. The echoes are then analyzed to define and locate discontinuities.

ULTRASONIC THICKNESS TESTING

Ultrasonic thickness measurement is a non-destructive testing method used to check the metal thickness of Structures, Pipes, Tanks, Vessel, Power plants, etc. Thickness measurement is essential to monitor corrosion, erosion, loss. Detection of metal loss caused by corrosion, erosion is vital to ensure the integrity of the inspected item/structure. It also helps us to determine whether the repair work or replacement is essential. Ultrasonic thickness measurement data gives customers the vital information required to find the thickness desired by design.


DYE PENETRANT TEST

Dye Penetrant Test is one of the simplest non-destructive test method utilized for detecting surface breaking discontinuities in non-porous, non-absorbing materials. Perhaps, the earliest form of Penetrant testing was done in rail road yards to check cracks in axels. The axles were soaked in oil overnight, removed from their oil bath, cleaned and a white powder applied. The axle would be lightly struck and oil would seep out of a crack, revealing its location. Modern Penetrant testing uses specially formulated dyes but still relies on capillary bleed out of the dye trapped in the flaw. Penetrant Testing can be utilized on any non-porous, non-absorbing material, on surfaces, entire objects and complex shapes. Penetrant testing can be utilized on a wide variety of materials detect inherent, primary processing and in-service discontinuities. Examples of detectable discontinuities are:-
Inherent: Ingot discontinuities such as Solidification cracks and porosity; Casting discontinuities such as Porosity, Shrinkage, Hot tears and Cols shuts.
Primary processing: Cracks during welding, straightening, bending, or due to internal stresses during processing, including heat treatment, plating and grinding. Porosity and surface opening inclusions in welds. Laminations detectable at the edge of the plate. Laps, Seams, and bursts, cracks in forging and forming operations. In-service Discontinuities: Service cracks caused by overloading, fatigue or corrosion.

MAGNETIC PARTICLE TESTING

Magnetic particle Testing used for the finding of surface and near surface defects inferro magnetic materials material such as iron, nickel, and cobalt, and some of their alloys and is primarily used for crack detection.
The test sample is magnetized either locally or overall. If there is a surface-breaking defect, the magnetic field is distorted, causing flux leakage around the defect. This leakage flux is displayed at the surface with very fine iron particles applied either dry or suspended in a liquid. The particles accumulate at the regions of flux leakage which can be seen visually. Thus, a crack/defect is indicated as a line of iron powder particles on the surface.

RADIOGRAPHIC TESTING

Radiography testing (RT) is non-destructive testing (NDT) methodwhich use X-rays or gamma ray to examine the internal structure of manufactured components identifying any flaws defects. X-Ray machine or Gamma Radiation is the source of the rays and transmits penetrating X or Gamma Rays. The object being radiographed partially absorbs these rays. In areas where there are flaws or breaks, a greater or smaller number of rays are able to penetrate.
Because X and Gamma Rays are invisible, a detecting agent is required to produce a visible picture. This detecting agent can be the radiographic film in light proof wrapping or a Digital image sensor. The areas where the film/ sensor has been exposed to more rays show up dark when developed. radiographic testing is widely used in the oil & gas aerospace, transport, military automotive, manufacturing, and power industries.
This is an expensive technique compared to the other non-destructive techniques and is Permanently used to defect internal flaws in casting and weldments .
This technique involves the use of penetrating gamma- or X rays radiation to examine the parts and products for imperfections are shown as the density changes in the film in the same manner as an X-rays shows broken bones. It is used as the standard test method for locating internal defects for all of the materials produced at brechmann-Glass-with use of Industrial radiography and X-rays technology, practically any material can be inspection for internal imperfection. X-rays are electromagnetic wave with a wavelength in manometer range and frequencies from roughly 1017 to 1022 Hz Industrial Radiography therefore deals with highly energetic very short- length wave.




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