What is non-destructive testing? Scope of application of non-destructive testing methods

Date：2023-03-17 14:40:38 Views：1305

Non destructive testing (NDT) is the use of optical, electrical, acoustic, magnetic, and other characteristics to detect whether there are defects in the tested object without damaging its integrity and usability, and can accurately provide information about the specific location, size, quantity, and nature of the defects. It is an indispensable technical means for the development of modern industry. With modern technology and equipment, the structure, properties, status, and defect types of the interior and surface of the test piece are analyzed The method of inspecting and testing the nature, quantity, shape, location, size, distribution, and changes thereof.

Non destructive testing is an essential and effective tool for industrial development, reflecting to a certain extent the level of industrial development of a country. The importance of non destructive testing has been recognized, mainly including radiographic testing (RT), ultrasonic testing (UT), magnetic particle testing (MT), and liquid penetrant testing (PT). Other non-destructive testing methods include eddy current testing (ECT), acoustic emission testing (AE), thermal imaging/infrared (TIR), leakage testing (LT), alternating current field measurement technology (ACFMT), magnetic flux leakage testing (MFL), far field testing and testing (RFT), ultrasonic diffraction time difference method (TOFD), and so on.

Detect whether there are defects or nonuniformities in the inspected object, and provide information such as defect size, location, nature, and quantity. Compared to destructive testing, non-destructive testing has the following characteristics. The first is non destructive because it does not damage the performance of the object being tested during testing; Secondly, it is comprehensive. Because the detection is non destructive, 100% comprehensive detection can be performed on the detected object when necessary, which is impossible for destructive detection; The third aspect is full process. Destructive testing is generally only applicable to the testing of raw materials, such as stretching, compression, and bending, commonly used in mechanical engineering. Destructive testing is conducted on raw materials for manufacturing. For finished products and articles in use, unless they are not ready for continued service, destructive testing cannot be conducted, and nondestructive testing does not damage the performance of the object being tested. Therefore, it can not only detect raw materials for manufacturing, various intermediate processes, and even the final product, but also detect equipment in service.

Non destructive inspection Visual inspection scope:

1. Inspection of weld surface defects. Check the welding quality such as weld surface cracks, incomplete penetration, and weld leakage.

2. Status check. Check for surface cracks, peeling, pulling wires, scratches, pits, bumps, spots, corrosion, and other defects.

3. Internal cavity inspection. When certain products (such as worm gear pumps, engines, etc.) are in operation, endoscopic inspection shall be conducted according to the items specified in the technical requirements.

4. Assembly inspection. When required and required, use the same three-dimensional industrial video endoscope to inspect the assembly quality; After assembly or completion of a certain process, check whether the assembly position of each component meets the requirements of the drawing or technical conditions; Whether there are assembly defects.

5. Surplus inspection. Check for residual debris, foreign objects, and other residues in the inner cavity of the product.

Conventional non-destructive testing methods include:

- Ultrasonic Testing (abbreviated as UT);

- Radiographic Testing (abbreviated as RT);

- Magnetic particle testing (abbreviated as MT);

Penetrant Testing (abbreviated as PT);

Eddy current testing (abbreviated as ET);

Non conventional non-destructive testing techniques include:

- Acoustic Emission (abbreviated as AE);

- Leak Testing (abbreviated as UT);

Optical holography;

Infrared Thermography;

- Microwave Testing

The above is the non-destructive testing related content organized by the Core Creation Testing editor, and I hope it can be helpful to you. Chuangxin Testing is a professional testing agency for electronic components. Currently, it mainly provides integrated circuit testing services such as capacitors, resistors, connectors, MCU, CPLD, FPGA, DSP, etc. Specializing in functional testing of electronic components, incoming appearance testing of electronic components, anatomical testing of electronic components, acetone testing, X-ray scanning testing of electronic components, and ROHS component analysis and testing. Welcome to call, we will wholeheartedly serve you!