Ultrasonic Inspection
Every plate is ultrasonically checked for its internal soundness in accordance with customer's specification or mill's standard. This device can inspect the whole volume of the plate at high sensitivity.
Ultrasonic testing (UT) encompasses a range of nondestructive testing (NDT) techniques that emit ultrasonic waves into an object or material. These high-frequency sound waves are transmitted into the material to characterize it or detect defects. Most UT inspection applications use short pulses of waves in the frequency range of 0.1-15 MHz, although frequencies up to 50 MHz can be used. A common application of this test method is ultrasonic thickness measurement, which is used to determine the thickness of an object, such as when evaluating corrosion in a pipeline.
1. What is ultrasonic testing?
Ultrasonic nondestructive testing, also known as ultrasonic NDT or simply UT, is a method of using high-frequency sound waves to characterize the thickness or internal structure of a test object. The frequencies (or pitches) used for ultrasonic testing are many times higher than the limit of the human hearing range, with the most common frequencies ranging from 500 kHz to 20 MHz.
2. How does ultrasonic testing work?
High-frequency sound waves are highly directional, and they propagate in one direction through a medium (such as steel or plastic) until they encounter a boundary with a different medium (such as air), at which point the sound waves are reflected back to the source. By analyzing the reflection of the sound waves, the thickness of the sample can be measured, or cracks or other hidden defects can be found.
3. What types of materials can be tested using ultrasound?
In industrial applications, ultrasound testing technology can be widely used to test a variety of materials such as metals, plastics, composites and ceramics. The only common engineering materials that are not suitable for ultrasound testing with conventional equipment are wood and paper products. Ultrasound technology is also widely used in diagnostic imaging and medical research in the biomedical field.
4. What are the advantages of ultrasonic testing?
Ultrasonic testing does not damage the workpiece at all. During the test, the workpiece does not need to be cut, sliced, or exposed to harmful chemicals. During the test, only one side of the sample is touched, which is different from the measurement method using mechanical thickness measuring tools such as calipers and micrometers. Ultrasonic testing does not pose a potential hazard to people's health, which is different from radiographic imaging.
As long as the correct settings are completed for the test, the test results will be highly repeatable and reliable.
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