Main characteristics of ultrasonic flaw detectors

Ultrasonic flaw detector is a portable industrial non-destructive flaw detection instrument, which can quickly, conveniently, non-destructively and accurately detect, locate, evaluate and diagnose various defects (cracks, inclusions, folds, pores, sand holes, etc.) inside the workpiece. It can be used in both laboratory and engineering site. This instrument can be widely used in manufacturing, iron and steel metallurgy, metal processing, chemical industry and other fields that require defect detection and quality control, and is also widely used in in-service safety inspections in aerospace, railway transportation, boiler pressure vessels and other fields and life assessment. It is a must for the non-destructive testing industry.
1. When the ultrasonic wave propagates in the medium, it has the characteristic of reflection on the heterogeneous interface. If a defect is encountered and the size of the defect is equal to or greater than the wavelength of the ultrasonic wave, the ultrasonic wave will be reflected back on the defect, and the flaw detector can display the reflected wave. ; If the size of the defect is even smaller than the wavelength, the sound wave will bypass the defect and cannot be reflected.
2. The directivity of wave sound is good. The higher the frequency, the better the directivity. It radiates into the medium with a very narrow beam, and it is easy to determine the position of the defect.
3. The propagation energy of ultrasonic waves is large. For example, the energy transmitted by ultrasonic waves with a frequency of 1MHZ (1 megahertz) is equivalent to 1 million times that of sound waves with the same amplitude and frequency of 1000HZ (Hertz).