Types of Ultrasonic Testing

Ultrasonic Testing (UT) means the application of a short and high-frequency ultrasonic pulse to detect flaws in an object or material. There are several non-destructive examination (NDE) ultrasonic techniques. The testing is done by emitting the waves into the material tested. By measuring the volume of these waves returning, the internal flaws and properties of the material are identified. Most Ultrasonic testing devices and flaw detectors are made up of several separate units. These components or units can include transducers, pulsers and receivers, and monitoring displays. The number of units depends on the type of ultrasonic testing that is to be done. 

 

Different Ultrasonic Testing Techniques

Ultrasonic testing includes many different types some of which are given below.

 

a. Automated Ultrasonic Backscatter Technique

Advanced Ultrasonic Backscatter Technique (AUBT) is an ultrasonic testing technique applied for investigating damage due to High-Temperature Hydrogen Attack (HTHA). This technique specifically is used in piping and pressure vessels. AUBT technique applies high frequency, broadband ultrasonic testing probes, and a digital oscilloscope. These components are used to provide an A-Scan display along with frequency analysis.

 

b. Phased Array Ultrasonic Testing

Phased Array Ultrasonic Testing (PAUT) is an ultrasonic testing technique that uses a set of ultrasonic testing probes made up of several small-sized elements which make an ultrasonic flaw detector machine. These elements range in number from 16 to more than 250 at a time. These elements can pulse individually in PAUT equipment. This is achieved through computer-calculated timing which is called phasing. Because of phasing, the PAUT system can steer focused beams through focal distances and several different angles. 

 

c. Long Range Ultrasonic Testing

Long Range Ultrasonic Testing (LRUT) is an ultrasonic testing method for testing large amounts of material from a singular testing point. This is done by attaching transducer rings around a pipe in a uniform manner. The rings emit a series of low-frequency guided ultrasonic waves. These waves propagate in a symmetrical manner along the axis of the pipe which provides the total coverage of the pipe wall.

 

d. Internal Rotating Inspection Systems

An Internal Rotating Inspection System (IRIS) is a UT testing method to detect corrosion in pipes and tubes by internally inserting a flaw detector probe in flooded pipes and tubes that emits ultrasonic sound waves. The probe then moves and scans through the pipe, detecting corrosion flaws.

 

e. Time of Flight Diffraction Technique

Time of Flight Diffraction (TOFD) is a UT testing technique to detect flaws in welds. An ultrasonic flaw detector machine uses the time of flight of a UT pulse to locate the defect which reflects the wave back. The transmitter used emits low-frequency ultrasonic waves that propagate at an angle. The waves diffract back only when they hit a defect and this way the flaw is located.

 

f. Dry-Coupled Ultrasonic Testing

Dry-Coupled Ultrasonic Testing (DCUT) is a cheap alternative method for inspecting metallic and nonmetallic objects and materials. This method does not need a liquid couplant for this purpose. DCUT flaw detectors and transducers have an edge over others as they can withstand high voltages. DCUT method is used in flexible, contact, wheel, and remote UT transducers.

 

1. Flexible ultrasonic flaw detectors can be applied both internally and externally on a surface of a component to detect flaws. 

2. Contact transducers are used to detect flaws and for measuring thickness too. 

3. Wheel transducers are used to inspect long piping systems quickly.

4. Remote transducers are particularly helpful as they can measure thickness remotely and through non-conventional angles that are not at a right angle to the surface. So, there is no need to construct supports or remove parts and components for inspection purposes.

 

g. Rapid Ultrasonic Gridding (RUG) Method

Rapid Ultrasonic Gridding (RUG) is a nondestructive examination method of measuring thickness through ultrasonic waves. In this method, multiple ultrasonic thickness detectors are used at the same time to quickly gather thickness measurements in an ad hoc or predefined space. The advantage of the RUG method is that it captures multiple A-Scan data points quickly than other traditional thickness measuring methods.

 

Modsonic Ultrasonic Flaw Detector Price List

The table below displays a price list and functions of Modsonic ultrasonic flaw detectors. For the detailed functions of the device, please click the Products page on our website.

 

 a. Model Name- Einstein II DGS/Function – Conventional/Price-?

b. Model Name- Arjun 10/Function – Conventional/Price-?

c. Model Name- Arjun 20/Function – Conventional/Price-?

d. Model Name- Arjun 30/Function – Conventional/Price-?

e. Model Name- Da Vinci Delta/Function – Imaging/Price-?

f. Model Name- Arya 16/Function – Multichannel/Price-?

Note: The prices in the table are for reference. Please contact us for the latest quotation.

 

 

Conclusion

So, these are the different types of ultrasonic testing methods and their application and uses in various sectors of industry.