Ultrasonic Testing For Non Destructive Testing

Ultrasonic Testing or UT as its known has programs in a wide range of sectors, from aerospace, automobile, to substance, oil, large storage space, and power creation and overseas. UT is aspect of a selection of techniques known as NDT (Non Destructive Testing) methods. Their objective in industry is to allow the examination of parts and equipment with no damage or disrupting the condition. This allows testing and knowing of degradation/problems to happen without further degrading the aspect or disrupting highly adjusted procedures.

Ultrasound Testing is a method that uses ultrasonic audio surf with high wavelengths which variety from 0.1 - 20 MHz, well above the sensible variety for listening to (20Hz - 20 KHz).  This surf can be instructed at components to identify faults, possibly unseen to the undressed eye. The procedure performs by using the online characteristics of audio surf, by predicting them at a content, they'll journey in a directly range through a content until they experience an area with another method (such as air) which will then cause them to indicate back. These insights can be calculated and used to discover faults such as breaks in components.

Ultrasound Inspection can be used on all materials and some non-metals, such as tangible and timber, though with less quality. In conventional UT a piezoelectric sensor / probe is run over the item to be examined, as power operates through the sensor / probe, it's transformed by the piezoelectric content within the sensor / probe into ultrasonic surf. These surf run through the content and are either obtained on the other part by an individual sensor / probe, or deflected and obtained by the unique sensor / probe. It can be used on a variety of materials, generally, steel, plastic materials, compounds and ceramics. The only real exclusions being wood and document.

Ultrasound is a non-destructive testing technique, significance that the technique presents pressures well below the flexible restrict of the content, and presents no risk of harm or deterioration. This is often useful when a defect may need delicate research. And also comes in useful when looking for faults in common.
Ultrasound and other NDT techniques are used in market to analyze components, often for protection and lawful factors, though sometimes for other uses such as examining hard to achieve locations before investing more money and/or attempt to examine the area detailed. Cases where frequent and generous use of NDT can be valuable become obvious when experienced with a program failing that can be extremely damaging to manufacturing or income. An example lately engaged a job where an energy place had to take generator off-line expectantly, resulting in not only stress, lost time, but also a large lack of manufacturing and included cost for fix.

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http://www.ndtindia.org/ultrasonic-investigation.html

 

Contact Details:

 

Sigma Test & Research Centre
Address : BA-15, Mangolpuri Industrial Area, Phase-2,
New Delhi, India-110034
Phone : + 91-11-49491444
Fax : + 91-11-43852040
Email : info@sigmatest.org

 

Advantages of Ultrasonic Investigation

Advantages of Ultrasonic Investigation

1. High sensitivity to both surface and subsurface discontinuities, permitting the detection of extremely small flaws.
2. Greater accuracy than other nondestructive methods in determining the depth of internal flaws and the thickness of parts with parallel surfaces.
3. Nonhazardous to operations or to nearby personnel and has no effect on equipment and materials in the vicinity.
4. Capable of portable or highly automated operation.
5. The depth of penetration for flaw detection or measurement is superior to other NDT methods.
6. Only single-sided access is needed when the pulse-echo technique is used.
7. It is highly accurate in determining reflector position and estimating size and shape.
8. Minimal part preparation is required.
9. Electronic equipment provides instantaneous results.
10. Detailed images can be produced with automated systems.
11. It has other uses, such as thickness measurement, in addition to flaw detection.

originally found here:- http://www.ndtindia.org/ultrasonic-investigation.html

Advantages of Ultrasonic Investigation

Advantages of Ultrasonic Investigation

1.     High sensitivity to both surface and subsurface discontinuities, permitting the detection of extremely small flaws.

2.     Greater accuracy than other nondestructive methods in determining the depth of internal flaws and the thickness of parts with parallel surfaces.

3.     Nonhazardous to operations or to nearby personnel and has no effect on equipment and materials in the vicinity.

4.     Capable of portable or highly automated operation.

5.     The depth of penetration for flaw detection or measurement is superior to other NDT methods.

6.     Only single-sided access is needed when the pulse-echo technique is used.

poriginally found here:- http://www.ndtindia.org/ultrasonic-investigation.html

Ultrasonic Pulse Velocity Test

Ultrasonic concrete testing is based on the pulse velocity method to provide information on the uniformity of concrete, cavities, cracks and defects. The pulse velocity in a material depends on its density and its elastic properties which in turn are related to the quality and the compression strength of the concrete. It is therefore possible to obtain information about the properties of components by sonic investigations. Test Method: IS 13311 (Part 1) 
The pulse velocity in concrete may be influenced by
a) Path length 
b) Lateral dimension of the specimen tested 
c) Presence of reinforcement steel 
d) Moisture content of the concrete

originally found here:- http://www.ndtindia.org/ultrasonic-investigation.html

Ultrasonic Flaw Detection Test

Ultrasonic Flaw Detection Test

Ultrasonic flaw detection is basically a comparative technique. Using appropriate reference standards along with knowledge of sound wave propagation and generally accepted test procedures, a trained operator identifies specific echo patterns corresponding to the echo response from good parts and from representative flaws. The echo pattern from a test piece may then be compared to the patterns from these calibration standards to determine its condition. Sound waves are simply organized mechanical vibrations traveling through a medium, which may be a solid, a liquid, or a gas. These waves will travel through a given medium at a specific speed or velocity, in a predictable direction, and when they encounter a boundary with a different medium they will be reflected or transmitted according to simple rules. This is the principle of physics that underlies ultrasonic flaw detection.

originally found here:- http://www.ndtindia.org/ultrasonic-investigation.html

Ultrasonic Investigation 

 Ultrasonic Flaw Detection Test

Of all the applications of industrial ultrasonic testing, flaw detection is the oldest and the most common. Since the 1940s, the laws of physics that govern the propagation of sound waves through solid materials have been used to detect hidden cracks, voids, porosity, and other internal discontinuities in metals, composites, plastics, and ceramics. High frequency sound waves reflect from flaws in predictable ways, producing distinctive echo patterns that can be displayed and recorded by portable instruments. Ultrasonic testing is completely nondestructive and safe, and it is a well established test method in many basic manufacturing, process, and service industries, especially in applications involving welds and structural metals.
originally found here:- http://www.ndtindia.org/ultrasonic-investigation.html