Learn ultrasonic non destructive testing in a short time

Practice,In fact, if you go to practice,,It's much stronger than reading a book.,If you have thinking,,You'll find problems from practice.,And then ask questions.,If you read a book.,I don't think it will play a role.。。 I've been lecturing for half a year.,I didn't remember anything.,And then it's going to be practical for 2 weeks.。。。

Ultrasound! Shockwave do you want to learn?

Summary. 4.Receiving ultrasonic waves: - Defects or interfaces inside a material reflect, scatter, or absorb ultrasonic waves. - The ultrasound probe receives these reflected waves and converts them into electrical signals.

Hello dear! We are glad to answer your questions!! Ultrasonic flaw detection of lead holes is a non-destructive inspection technique that can be used to detect defects, cracks, wall thickness, and other problems inside materials. The following is the detailed process of ultrasonic flaw detection:

1.Preparation: - Determine the type and thickness of the material to be inspected. - Select the appropriate ultrasound probe and couplant. - Adjust the frequency and angle of the ultrasound probe eggplant's head.

2.Prepare the material: - Clean the surface of the material to be inspected and be careful to ensure that accurate ultrasonic antifiber beam waves are obtained. - Apply couplant between the probe and the material to transmit the ultrasound waves.

3.Send ultrasound waves: - Attach the ultrasound probe to the surface of the material and shoot the ultrasound wave through the probe hair and stocking. – Ultra and acoustic waves are passed from the probe into the material, first through the couplant and then into the material.

4.Ultrasound with state limb retraction: - Defects or interfaces within the material will reflect, scatter or absorb ultrasound waves. - The ultrasound probe receives these reflected waves and converts them into electrical signals.

5.Processing Signal: Early High - The electrical signal is masked by processing segments such as amplification and filtering to enhance signal strength and reduce noise. -Digital signal processing techniques can also be used for further processing and analysis of signal grips.

6.The acre-solver reads and analyzes: - According to the special service of the signal, it is possible to determine the type and location of defects inside the material. - Commonly used analysis methods include time-domain analysis, frequency-domain analysis, and imaging techniques.

7.Recording & Reporting: - Record the results of the inspection in a report, including information such as material type, detection method, skidding and size of the missing cara. - If required, the report can include images, digital signal mitigation data, and inspection conclusions.

Ultrasonic flaw detection can be applied to a variety of materials and fields, such as the manufacture of metals, plastics, ceramics, concrete, aerospace, nuclear engineering, building structures, etc. It has the advantages of fast detection speed, high resolution, and low cost, so it is widely used in industrial and scientific research fields.

Dear, I am glad to answer for you: the characteristic of ultrasonic flaw detection is that it is sensitive to surface defects perpendicular to the ultrasonic propagation direction, and it is easy to detect such defects; When ultrasonic waves penetrate materials with relatively loose structures, the attenuation is more obvious, and the noise signal reflection is more obvious. The advantages of ultrasonic flaw detection are that the instrument is easy to carry, the detection thickness is large, the sensitivity is high, the speed is fast, the cost is low, it is harmless to the human body, and the defects can be located and quantified. However, ultrasonic flaw detection is not intuitive to the display of defects, the flaw detection technology is difficult, it is easy to be affected by subjective and objective factors, and the flaw detection results are inconvenient to preserve, so that ultrasonic flaw detection also has its limitations.

The welding quality is greatly affected by human factors and the environment, and there are echoes generated by welding defects such as lack of weld penetration, non-fusion, cracks, porosity and slag inclusion during ultrasonic testing, and there may also be echoes caused by weld forming (concave or convex) and misalignment. Some echo signals appear in the same or similar position on the oscilloscope screen of the flaw detector, and some are very similar in form, which brings difficulty to the identification of the detection work, and may cause misjudgment and omission. Before the inspection, the condition of the workpiece to be inspected should be investigated (e.g

welding process, groove form, blunt edge height, blunt edge clearance, etc.). Analyze the possibility of defects and their location in the weld, and correctly judge the reflected echoes; It can prevent the missed detection and false detection of defects in the weld, and at the same time, the dynamic echo change characteristics of the defects can be observed in combination with the scanning method of the probe. The analysis is as follows:

Punctate defects: porosity is a cavity formed by the failure of the gas in the molten pool to escape in time when the molten pool solidifies during the welding process, and the porosity defect contains gas, the acoustic impedance is very small, the reflected echo is high, and the waveform is steep and sharp; The height of the reflected wave is about the same when detected from all directions, but the reflected wave disappears with a slight movement of the probe.

This kind of thing is best to deeply reflect on the mistakes and gains in the work, and it cannot be replaced

Ultrasonic flaw detection instrument is a set of advanced science and technology as one of the testing instruments, it plays a very important role in the process of the hospital, and can also be used for fast and accurate inspection of parts, so as to achieve the purpose of safety. Compared with other detectors, ultrasonic detectors can complete the operation in a short time, and it is relatively simple to use, and the accuracy and sensitivity are also incomparable with similar products.

(1) The working principle of ultrasonic flaw detection instrument

As the name suggests, ultrasonic flaw detection instruments mainly rely on the unique properties of ultrasonic to achieve flaw detection, of course, this is mainly because ultrasonic has a variety of wave types and is suitable for a variety of propagation media.

When in use, its shear wave can accurately monitor the pipe, especially those cracks, scratches and porosity. Its longitudinal wave can quickly detect metal ingots, blanks, large forgings, etc., especially those white spots and delamination. However, its plate wave can detect the normal condition of the thin plate, unlike the surface wave, which can only detect the defects of some castings with relatively simple shapes.

Therefore, ultrasonic flaw detection instruments can help people's work very well when they are used.

(2) Advantages of ultrasonic flaw detection instruments

Because ultrasonic waves are used for detection, this flaw detector has a relatively high penetrating power, and it can even detect conditions below several meters when working. And its sensitivity is also very good, when in use, it can find reflectors that other detectors cannot find in a short time, and can accurately confirm the orientation, shape and size of the substance, and it can quickly respond to the detected results. Compared with similar products, it only needs to be measured from one side of the measured object when it is used, which saves manpower and time to a great extent, and its size is relatively small and easy to carry, and it is not only relatively simple to operate, but also has a very good safety performance.

(3) Deficiencies of ultrasonic flaw detection instruments

At present, ultrasonic flaw detection instruments are not accurate enough to inspect irregularly shaped or heterogeneous materials, and they are not suitable for the measurement of structures with cavities.

In summary, it can be seen that although there are certain deficiencies in the ultrasonic flaw detection instrument, its overall performance is still very good. And it plays a very important role in industry, water conservancy engineering, medical equipment, rescue equipment, etc., for people to use wave flaw detector can greatly improve the accuracy, but also save a lot of manpower, is a good choice in the actual operation process.

Main advantages Strong penetration, detection depth up to several meters; High sensitivity, which can detect reflectors comparable to the reflective capacity of an air gap about a few tenths of a millimeter in diameter; It is more accurate in determining the orientation, size, shape and nature of the internal reflector; The object to be inspected must only be approached from one side; Defect inspection results can be provided immediately; The operation is safe and the equipment is lightweight.

1.Strong penetrating ability, detection depth up to several meters; 2.High sensitivity, which can detect reflectors comparable to the reflective capacity of an air gap about a few tenths of a millimeter in diameter; 3.

It is more accurate in determining the orientation, size, shape and nature of the internal reflector; 4.The object to be inspected must only be approached from one side; 5.Defect inspection results can be provided immediately; 6.

The operation is safe and the equipment is lightweight.