What is an Ultrasonic Flaw Detector? What is the difference between ultrasonic and radiographic test

Ultrasonic flaw detector is a portable industrial non-destructive testing instrument, which can quickly, conveniently, non-destructively and accurately detect, locate, evaluate and diagnose a variety of defects inside the workpiece.

It can also be used in the laboratory or in the engineering field.

The flaw detection methods of ultrasonic flaw detectors can be divided into four categories: type A, type B, type D and type M. Ultrasonic flaw detectors collect and store data comprehensively, objectively, and in real time.

Processing or post-processing, time-domain, frequency-domain or image analysis of the signal, can grade the quality of the workpiece through pattern recognition, thereby reducing the influence of human factors and improving the reliability and stability of retrieval. For more related definition information, please refer to Shanghai Yiping Instrumentation ****** search directly!

Shifeng Huamei, specializing in ultrasonic flaw detectors.

Difference Between Radiographic Flaw Detection and Ultrasonic Flaw Detection:

Radiation: Radiation to the human body. There are negatives, which are strong in detecting excessive defects such as porosity and adulteration.

Ultrasound: no radiation to the human body. Without negatives, detection of cracks and other out-of-standard defects is a strength.

X-ray is sensitive to volumetric defects, but it is difficult to find linear defects, especially subtle unwelded penetration (lack of melting) or microcracks in thick plates, while ultrasonic flaw detectors are sensitive to linear defects, but the quantification of point defects is not easy to be accurate. Radiography does not have high requirements for the appearance of the workpiece.

It is used to evaluate the quality of welds through negatives, which is intuitive and easy to characterize and archive, but it is difficult to determine the size of the depth bias. The ultrasonic flaw detector has strict requirements for the detection surface.

It is through the waveform on the phosphor screen to evaluate the defect, which is characterized by easy to determine the depth, but not intuitive and not easy to archive, qualitative to be comprehensively judged, the inspector should be good in nature and strong sense of responsibility.

Radiation is harmful to the human body, so it is necessary to protect, and it consumes a lot of film and medicine, and the detection cost is high, while the ultrasonic flaw detector is harmless to the human body, and the detection cost is low.

Radiographic testing of coarse-grained materials (e.g., austenitic welds, etc.) is difficult to detect, while ultrasound is difficult to detect such materials.

Radiation: Radiation to the human body. There are negatives, which are strong in detecting excessive defects such as porosity and adulteration. The British were more optimistic about this approach.

Ultrasound: no radiation to the human body. Without negatives, detection of cracks and other out-of-standard defects is a strength. Europeans are more optimistic about this approach.

The ray can determine the position and size of the defect plane projection, and is not suitable for the inspection of forgings, pipes, bars, T-joints, corner joints and surfacing layers. Ultrasound determines the position and relative size of defects and is suitable for the inspection of forgings, tubes, bars, T-joints, corner joints, and weld overlays.

Ultrasonic flaw detection can only locate and quantify, and the defect morphology cannot be determined.

The rays can see the topography of the internal defect, but cannot locate it.

Ultrasonic flaw detection has no great impact on the human body, and radiation is harmful to the human body.

Both ultrasound and radiography detect internal defects. However, radiographic imaging can only inspect thinner workpieces, while ultrasonic can inspect larger, thicker workpieces.

【Shanghai Bajiu】Reminder: Generally, ultrasonic flaw detectors will have instructions, you can read the instructions. The approximate steps are as follows:

1. After connecting the instrument and probe, turn on the main power switch of the flaw detector and press the operation button to set the status of the system.

2. Press the operation key to preset the year, month, and day.

3. Enter the channel preset channel, select the flaw detection method and probe type, and enter the nominal value of the size of the probe element (the leading distance should also be entered for the oblique probe).

4. Place the probe on the CSK-IA test block and adjust the "gain" button of the instrument.

5. Measure or use the "zero" key to preset the zero offset of the probe.

6. Measure or use the "speed of sound" key to preset the speed of sound wave propagation in the workpiece (speed of sound).

7. When using the angle probe, you need to use the "K value" key to preset the K value.

8. Select the scale definition and size of the instrument with the "sound path" key.

9. When surface compensation is required, use the "compensation" button to compensate.

10. After the setting is over, press the "Function" button to enter the working state.

11. Coat the couplant on the surface of the measured workpiece, place the probe on the tested workpiece, move the probe to check whether the workpiece has defects, and freeze the found defects with the "quantitative" key and record them with the "record" key.

12. Record the defects detected.

13. After the detection is completed, turn off the main power switch of the instrument, remove the probe, wipe off the oil stain on the surface of the instrument and the probe and put it into the instrument box.

At present, there are many manufacturers of ultrasonic flaw detectors on the market, and the following are some common manufacturers:

1.GE Inspection Technologies: A leading global provider of industrial inspection solutions, producing a wide range of ultrasonic flaw detectors and other industrial inspection equipment.

2.Olympus: This is a global technology company that provides a variety of industrial inspection equipment, including ultrasonic flaw detectors, microscopes, and optical equipment.

3.Sonotron NDT: This is an Israeli company that offers a wide range of non-destructive testing equipment, including ultrasonic flaw detectors, eddy current flaw detectors, and magnetic particle flaw detectors, among others.

4.Zetec: This is a U.S.-based company that focuses on providing high-quality non-destructive testing equipment and services, including ultrasonic forward wave flaw detectors, eddy current flaw detectors, and magnetic particle flaw detectors, among others.

5.Krautkramer: This is a German company, which is a company specializing in the production of ultrasonic flaw detectors, and its products are widely used in aviation, aerospace, automotive, shipbuilding, chemical, energy and other fields.

This is just some of them, there are many other ultrasonic flaw detector manufacturers. When choosing an ultrasonic flaw detector, you should choose the right product and manufacturer according to your needs.

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What do 5, p, and 14 represent in the flaw detection head 5p14.

Hello pro The model of the 5th generation seepage table flaw detector head, P represents the interface type of the detection spike shouting instrument that is suitable for guessing, and the interface type is P interface, and 14 represents its working frequency of 14MHz.