VIDAL NDT is a qualitatively different NDT training institute by offering broad range of training testing services in Vijayawada floated by qualified professionals. We foster our students by hostile training methods by experts and with the most effective resources and further to enrich them with various career opportunities in both India and abroad. We are committed to quality training and reliable NDT inspections. We have been offering training in area of NDT by providing critical NDT solutions to many of our clients.
VIDAL NDT is a qualitatively different NDT training institute by offering broad
range of training testing services in Vijayawada floated by qualified professionals. We
foster our students by hostile training methods by experts and with the most effective
resources and further to enrich them with various career opportunities in both India
and abroad. We are committed to quality training and reliable NDT inspections. We
have been offering training in area of NDT by providing critical NDT solutions to many
of our clients.
We follow RRR strategy for 100% satisfaction and benefit
of the students.
Requisite We requisite through college seminars, demos and awareness programs
Rearrange We rearrange students by our way of teaching though our courses.
Recruit Finally we prepare the students for company recruitments
Nondestructive testing or non-destructive testing (NDT) is a wide group of analysis
techniques used in science and technology industry to evaluate the properties of a material,
component or system without causing damage. Here the NDT Courses.
1) ULTRASONIC TESTING[UT]:
Ultrasonic testing is a method of characterizing the thickness or internal structure of a test
piece using high frequency sound waves to find
the weld and base metal defects.
Ultrasonic inspection can be used for flaw
detection/evaluation, dimensional measurements,
material characterization, and more. Ultrasonic
testing can remotely generate ultrasound in
materials without contact, leaves a very small
footprint so that it can be applied to irregular
geometries, and allows access to restricted areas
via fiber optics. It is used as non-contact and remote, allowing inspection of samples at high
temperature, which can be seen during welding with restricted access. It enables inspection of small
and complex geometries and high frequency capable of detecting very small flaws, Laser beam
scanning method for full coverage of inspection samples…
In NDT, radiography is one of the most important and widely used methods. Radiographic
testing (RT) offers several advantages over other NDT methods, however, one of its major
disadvantages is the health risk associated with the radiation. This method of weld testing makes use
of X-rays, produced by an X-ray tube, or gamma rays, produced by a radioactive isotope. The basic
principle of radiographic inspection of welds is the same as that for medical radiography. Penetrating
radiation is passed through a solid object, in this case a weld rather that part of the human body, onto
a photographic film, resulting in
an image of the object’s internal
structure being deposited on the
film. The amount of energy
absorbed by the object depends
on its thickness and density.
Energy not absorbed by
the object will cause exposure of
the radiographic film. These areas
will be dark when the film is
developed. Areas of the film exposed to less energy remain lighter. Therefore, areas of the object
where the thickness has been changed by discontinuities, such as porosity or cracks, will appear as
dark outlines on the film. Inclusions of low density, such as slag, will appear as dark areas on the film
while inclusions of high density, such as tungsten, will appear as light areas. All discontinuities are
detected by viewing shape and variation in density of the processed film.
Magnetic particle examination (MT) is a very popular, low-cost method to perform
nondestructive techniques of examination of ferromagnetic material. Magnetic Particle Testing
Examination is accomplished by inducing a magnetic field into a ferromagnetic material and applying
iron particles to the surface of the item being examined. Ferromagnetic is defined in ASME Section V
as “a term applied to materials that can be magnetizedor strongly attracted by a magnetic field.” MT
is an NDE method that checks for surface discontinuities but can also reveal discontinuities slightly
below the surface.
Surface and near-surface discontinuities affect the flow of the magnetic field within the part causing
the applied particles to gather at locations of flux leakage, thus producing a visible indication of the
irregularity on the surface of the material. By the 1930s, MT was quickly replacing the oil and whiting
method of NDE (liquid penetrant [PT]) in the railroad industry. It was quicker and did not leave
behind the white powder that required clean-up. After an MT evaluation, only iron powder was left
behind, which could easily fall off the part or be blown away.
out of a colored or fluorescent dye from the flaw. The technique is based on the ability of a liquid to
be drawn into a “clean” surface breaking flaw by capillary action. After a period called the “dwell,”
excess surface penetrant is removed, and a developer applied. This acts as a blotter. It draws the
penetrant from the flaw to reveal its presence. Colored (contrast) penetrants require good white
light while fluorescent penetrants need to be used in darkened conditions with an ultraviolet “black
Liquid penetrant inspection is a method that is used to reveal surface breaking flaws by bleed
The advantage that a liquid penetrant inspection (LPI) offers over an unaided visual inspection
is that it makes defects easier to see for the inspector. There are basically two ways that a penetrant
inspection process makes flaws more easily seen. First, LPI produces a flaw indication that is much
larger and easier for the eye to detect than the flaw itself. Many flaws are so small or narrow that
they are undetectable by the unaided eye. Due to the physical features of the eye, there is a threshold
below which objects cannot be resolved. This threshold of visual acuity is around 0.003 inch for a
person with 20/20 vision.
Radiography film interpretation test is basically of recording of varying degree of absorption of
penetrating radiation by an object. In conventional film radiography, this varying of absorption
produces a latent image of object being examined on the film. The film is chemically processed,
transforming the latent image into
permanent shadow image of internal and
external condition of the project. The
processed film is called radiograph. The
radiograph can be interpreted and thee
integrity of the object can be evaluated. The
major objective of radiographic testing of
castings is the disclosure of defects that
adversely affect the strength of the product.
Castings are a product form that often
receive radiographic inspection since many
of the defects produced by the casting process are volumetric in nature, and are thus relatively easy
to detect with this method. These discontinuities of course, are related to casting process
deficiencies, which, if properly understood, can lead to accurate accept-reject decisions as well as to
suitable corrective measures. Since different types and sizes of defects have different effects of the
performance of the casting, it is important that the radiographer can identify the type and size of the
defects. ASTM E155, Standard for Radiographs of castings has been produced to help the
radiographer make a better assessment of the defects found in components. The castings used to
produce the standard radiographs have been destructively analyzed to confirm the size and type of
Visual Examination is the oldest and most common non-destructive testing method which is
an effective way to recognize surface imperfections that could adversely affect a part or component.
Visual Examiners use knowledge of how a part is manufactured, the function of the human eye,
lighting requirements, and precise measuring tools to evaluate materials.
Computer controlled camera systems and optical aids such as borescopes may also be used to
recognize and measure features of a component. In visual testing the product forms including castings,
forgings, machined components and weld elements etc. are tested.
Visual inspection is the process of examination and evaluation of systems and components by
use of human sensory systems aided only by mechanical enhancements to sensory input such as
magnifiers, dental picks, stethoscopes, and the like. The inspection process may be done using such
behaviors as looking, listening, feeling, smelling, shaking, and twisting. “It includes a cognitive
component wherein observations are correlated with knowledge of structure and with descriptions
and diagrams from service literature.”
40-1-100, 4th Floor,
HRT Plaza, Bandar Road,
Benz Circle, Vijayawada,
Andhra Pradesh 520010.
D.No-304, 3rd floor, Gyan arcade,
Beside Seshmahal Cinema Theater,
Ammerpet Hyderabad, A.P, India
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