What are the principles and characteristics of the ultrasonic flaw detector?

The ultrasonic flaw detector is a portable non-destructive industrial flaw detection instrument, which can quickly, easily, non-destructively and accurately detect various flaws (welds, cracks, inclusions, creases, pores, sand holes , etc.) inside the room, locate, assess and diagnose.

It can be used both in the laboratory and on the engineering site.

Compared with X-ray flaw detection, ultrasonic flaw detection has the advantages of higher flaw detection sensitivity, short cycle time, low cost, flexibility and convenience, high efficiency and harmlessness to human body.

Its main characteristics are:

(1) When the ultrasonic wave propagates through the medium, it has reflection characteristics on different interfaces . When the size of the defect is equal to or greater thane to the wavelength of the ultrasonic wave;

The ultrasonic wave reflects off the flaw 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 the sound wave is good, the higher the frequency, the better the directivity, so A very narrow beam radiates in the medium, and it is easy to determine the position of the defect.

(3) The propagation energy of the ultrasonic wave is large, such as the energy transmitted by the ultrasonic wave with a frequency of 1MHZ (1 MHz), which is equivalent to 1 million times the sound wave with the same amplitude and frequency of 1000HZ (Hertz).

Tag: Ultrasonic Flaw Detector