What parameters need to be focused on for a good ultrasonic eddy current integrated flaw detector

A good instrument is one that meets your needs. Whether the index is low or too high, it is considered a selection error.

If the landlord does not understand the instrument, it can be carried out from the following perspectives:

1. Make your request.

2. Collect the technical parameters of the instruments that can meet the requirements of 3-4 instrument manufacturers according to your requirements, and discuss the necessity with them respectively.

3. Visit the site of similar applications that have been made, and inspect the strength and work cases of the best businessmen.

4. Summarize the above and determine a first-class business.

Characteristics of portable testing instruments: low cost, full inspection or sampling can be carried out as needed, and the general testing workload is not too large.

Portable flaw detectors do not seem to have ultrasonic and eddy current integrated together, so they need to be purchased separately.

Conversely, the demander should put forward the measurement requirements, determine the defect type, length, width, and depth indicators, and then the supplier will provide solutions and use instruments and configure machinery.

Ultrasonic C-scan is suitable for measuring intrinsic defects and can locate them. Eddy currents are suitable for measuring shallow surface defects and hardness material sorting. The two technologies are combined with traditional magnetic particle testing to form a complementary flaw detection sorting system. Together with the optical system, it is the perfect version of the first inspection.

Whether it is an all-in-one machine or not is not the key point, what you want to solve is the key.

Ultrasonic flaw detection is the use of sound propagation to detect flaws, and eddy current is based on the principle of electromagnetic induction.

Look at the size, specification, material, eddy current used to detect some surface or near-surface defects, such as air cooler, tube bundle, heat exchanger, etc., ultrasonic for the pipe generally needs to be larger, the diameter of the pipe is 219, the thickness can not be too thin, more than 7, etc.· Materials are also important parameters.

Description of the main technical indicators of the core components of the ultrasonic flaw detector:

1. Sensitivity.

Sensitivity in ultrasonic flaw detection generally refers to the ability of the entire flaw detection system (instrument and probe) to find the smallest defects. The smaller the defect found, the higher the sensitivity.

The sensitivity of an instrument's probe is measured by a sensitivity margin. The sensitivity margin is the total amount of attenuation required to achieve the reference high of the specified reflector echo at the maximum output of the instrument (gain, emission intensity is maximum, and attenuation and suppression are 0). The large sensitivity margin indicates that the sensitivity of the instrument and the probe is high.

The sensitivity margin is related to the comprehensive performance of the instrument and the probe, so it is also called the comprehensive sensitivity of the instrument and the probe.

2. Blind zone and initial pulse width.

The dead zone is the minimum distance from the probe surface to where the defect can be found. Defects in the blind spot cannot be found.

The initial pulse width refers to the duration of the initial pulse when the height of the screen exceeds 20% of the vertical amplitude under a certain sensitivity. The initial pulse width is related to the sensitivity, and the high sensitivity is the large initial pulse width.

3. Resolution.

Instrument-to-probe resolution refers to the ability to distinguish between two adjacent defects on the screen. The smaller the distance between two adjacent defects, the higher the resolution.

4. Signal-to-noise ratio.

The signal-to-noise ratio is the ratio of the amplitude of the smallest defective signal on the screen to the amplitude of unwanted noise clutter. The signal-to-noise ratio is high and clutter is less, which is beneficial for flaw detection. If the signal-to-noise ratio is too low, it is easy to cause missed detection or misjudgment, and even flaw detection cannot be carried out in serious cases.

Ultrasonic flaw detection instrument is a set of advanced technology as one of the detection 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, the use of wave flaw detector can experience and improve accuracy in a large range of limb bending, and also saves a lot of manpower, is a good choice in the actual operation process.

You can get it for free

The concept of ultrasonic flaw detection: ultrasonic flaw detection refers to ultrasonic testing (ultrasonic testing) abbreviated as UT, also known as ultrasonic testing, which is one of the five conventional nondestructive testing methods.

The principle of ultrasonic flaw detection: the ultrasonic flaw detector will send a wide and high-frequency pulse electrical signal to be added to the piezoelectric element of the probe, and the reverse piezoelectric effect will cause the element to produce elastic deformation, resulting in ultrasonic waves; After coupling, the ultrasonic wave is passed into the probed workpiece (insulator), and it is reflected when it encounters a heterogeneous interface, and the reflected ultrasonic wave will also act on the probe, and the electrical signal is generated for analysis due to the effect of positive piezoelectricity, and the defects can be known. This is also known as "flaw detection".

Expansion: Nondestructive testing is a means of inspecting the surface and internal quality of the inspected parts without damaging the working condition of the workpiece or raw materials. At present, the relevant domestic ultrasonic testing standards are JB, GB T11345-1989, CB T3559-2011, etc.

JB is a more comprehensive standard, and the latter two standards are weld testing standards, as well as other steel plates, castings and forgings and other testing standards, users can make corresponding inquiries according to their needs.

Unlike a specific gas sensor, which is limited by the specific gas it is designed to sense, the ultrasonic detector leak detection system uses sound to detect. Any gas passing through the leak hole will generate eddy currents, and there will be a portion of the ultrasonic band, allowing the ultrasonic detector leak detection system to sense any kind of gas leak.