What basic factors will affect the use of ultrasonic flaw detectors

Factors that affect the detection accuracy of ultrasonic flaw detectors are: detection object, temperature, surface roughness, magnetic field, adhesion material, shape characteristics of the defect, acoustic impedance of the defect, and surface characteristics of the defect (such as smoothness).

1, the impact of materials

It is thought that the speed of sound of an object like steel, even if it contains many different alloy components, is essentially constant. However, in many other materials, such as many non-ferrous metals or plastics, the change in the speed of ultrasonic propagation is very significant, thus affecting the accuracy of the measurement. If the material to be tested is not isotropic, then the speed of sound will be different in different directions. In this case, the average speed of sound over the detection range must be used to calculate. The mean value is obtained by measuring a reference block whose sound speed is equivalent to the mean sound speed of the block to be measured.

2. The influence of temperature

The speed of sound varies with the temperature of the material. If the instrument calibration is carried out in a relatively low temperature environment, and the instrument is used in a relatively high temperature environment, this situation will cause the test results to deviate from the true value. To avoid this effect of temperature, the method is to preheat the reference block before calibrating the instrument to achieve the same ambient temperature as the use; Alternatively, the measured value is multiplied by a temperature influence factor.

3, the impact of surface roughness

The surface roughness of the inspected part has an effect on the quality of the inspected part. As the roughness increases, so does the impact. Rough surfaces can cause systematic and unexpected errors, which should be overcome by increasing the number of measurements at different positions during each measurement.

4. Effects of attachment materials

The attached material must be removed before the inspection to ensure that the probe of the instrument is in direct contact with the surface of the part under test.

5. The influence of magnetic field

The strong magnetic field generated by the surrounding electrical equipment can seriously interfere with the inspection work.

Is there any way to eliminate the noise of ultrasonic cleaning machine

In the use of ultrasonic cleaning machine, will produce not high or low noise, some people can accept, but some people are difficult to accept, because harsh and uncomfortable, so why there is noise? Can the noise of ultrasonic cleaning machine be eliminated? Let me introduce you

The noise produced by ultrasonic cleaning machine is because of the skill and working principle of ultrasonic itself, and the noise is inevitable, which is because the ultrasonic cleaning machine is the pressure of cleaning the workpiece through the cavitation of the liquid, so as to achieve the cleaning effect and remove the dirt on the surface of the workpiece.

When the liquid air is not available, countless forms of impact on the surface of the workpiece bubble rupture, and then by the appearance of "sizzling" noise, in addition, strong and rapid vibration of the ultrasonic vibrator can also emit a "buzz" noise, but under normal circumstances, it is only twenty or thirty decibels, it can be said, Ultrasonic cleaning machine no noise, is equal to no work, but in order to ensure safety, improve the humanization of the cleaning process, can greatly reduce the noise, will not bring trouble to the human body, then the practical way to reduce the noise of the ultrasonic cleaning process?

Can the noise of ultrasonic cleaning machine be eliminated? Although it is not possible to completely eliminate noise, current advanced technology can improve noise reduction. Jieo manufacturers will be equipped with sound insulation accessories in the bathtub or around the bathtub, such as sound insulation cotton, etc., this measure is necessary, although it can absorb ultrasonic will affect the efficiency, but in order to protect the environment, protect human health is more favorable than the shortcomings, Jieo stainless steel ultrasonic cleaning machine is equipped with efficient sealing cover, effectively reduce noise, noise can be controlled within the acceptable range.

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