Tuesday, January 24, 2017

Techshore Inspection Services : Ultrasonic Testing techniques

Ultrasonic testing is a very versatile inspection method, and inspections can be accomplished in a number of different ways.
Ultrasonic inspection techniques are commonly divided into three primary classifications.

  1. ulse-echo and Through Transmission (Relates to whether reflected or transmitted energy is used)
    In pulse-echo testing a transducer sends out a pulse of energy and the same or a second transducer listens for reflected energy, also known as an echo. Pulse echo is especially effective when only one side of a material is accessible.Through transmission is performed using two transducers on opposing sides of the specimen. One acts as a transmitter & the other as a receiver. Through transmission is useful detecting discontinuities that are not good reflectors & when signal strength is weak.
  2. Normal Beam and Angle Beam (Relates to the angle that the sound energy enters the test article)
    Normal beam testing uses a sound beam that is introduced at 90 degrees to the surface, while angle beam utilizes a beam that is introduced into the specimen at some angle other than 90 degrees. The choice between the two is made based on:

    a). The orientation of the feature of interest so that the sound may produce the largest reflection from the feature
    b). Obstructions on the surface of the specimen that must be avoided
  3. Contact and Immersion (Relates to the method of coupling the transducer to the test article)
    To get useful levels of sound energy into the material, the air between the transducer and the specimen must be removed. This is referred to as coupling. Two types of coupling are utlizied:

    a). In contact testing, a couplant such as water, oil or a gel is applied between the transducer and the specimen
    b). In immersion testing, the specimen and the transducer are placed in a water bath. This allows better movement of the transducer while maintaining consistent coupling






References :
www.ndt-ed.org
www.asnt.org
www.mistrasgroup.com

Related blogs :

http://techshoreinspections.blogspot.com/2017/01/Techshore-Inspection-Services-ndt-ultrasonic-testing.html
http://techshoreinspections.blogspot.com/2016/12/Techshore-Inspection-Services-liquid-penetrant-test.html
http://techshoreinspections.blogspot.com/2016/10/ultrasound-testing-techniques-contact.html
http://techshoreinspections.blogspot.com/2016/10/ultrasound-testing-technique-through.html
http://techshoreinspections.blogspot.com/2016/10/ultrasound-testing-techniques-pulse.html
http://techshoreinspections.blogspot.com/2016/10/ultrasonic-testing-techniques.html
http://techshoreinspections.blogspot.com/2016/10/ultrasound-generation-principles-of.html
http://techshoreinspections.blogspot.com/2016/10/ndt-ultrasonic-testing-beam-explained.html
http://techshoreinspections.blogspot.com/2016/10/introduction-to-ndt-non-destructive.html
http://techshoreinspections.blogspot.com/2016/09/techshore-non-destructive-testing-ndt.html
http://techshoreinspections.blogspot.com/2016/09/techshore-inspection-services-explains_6.html

Documents :

https://www.slideshare.net/techshoreinspectionservices/civil-engineering-process-of-well-treatment-techshore
https://www.slideshare.net/techshoreinspectionservices/ndt-ultrasonic-testing-techshore
https://www.slideshare.net/techshoreinspectionservices/ndt-liquid-penetration-test-techshore

 Additional references:
https://www.youtube.com/channel/UCfufdF0-Hs3sLu1IX52ZJYA/videos
http://techshore.in/blog
http://techshore-updates.blogspot.in/
https://techshore-inspection-services.blogspot.in/
https://techshoreinspectionservices.blogspot.in/
https://techshoreinspections.blogspot.in/

You Tube Tutorials :
https://www.youtube.com/watch?v=bfW1eL0aTlU
https://www.youtube.com/watch?v=URlwZ3R94u8
https://www.youtube.com/watch?v=6w9Cl58-p34
https://www.youtube.com/watch?v=ZVnsx5VC77g
https://www.youtube.com/watch?v=3ZD4je9Fbn8
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