Application difference between industrial CT and X-ray in Nondestructive Testing Technology

Date：2021-08-26 14:14:00Views：1450

The earliest application of nondestructive testing technology to actual production was in 1868. Saxoby in Britain used the magnetism of compass to detect cracks in gun barrel. Industrial CT needs the assistance of computer software, so although the relevant mathematical theory of tomography was put forward by J. radon as early as 1917, it only became a new imaging technology after the emergence of computer and combined with radiology. It shows its uniqueness in industry, especially in the field of nondestructive testing (NDT) and nondestructive evaluation (NDE). Therefore, the international nondestructive testing community calls industrial CT the best nondestructive testing method.

Since the 1980s, the major industrialized countries in the world have put X-ray or γ X-ray ICT is used for NDT and NDE in aerospace, aviation, military, metallurgy, machinery, petroleum, electric power, geology, archaeology and other departments. China has gradually applied Industrial CT testing technology to the field of industrial nondestructive testing in the 1990s. At present, in the field of industrial CT detection, the detection method of large fan angle, wide fan beam and full inclusion has become popular. This method improves the detection efficiency and takes into account the cost. The powerful image processing function can accurately identify a variety of defects of the inspected workpiece, classify, mark and count various defects, and prevent operators from missing judgment and misjudgment caused by operation errors.

Modern nondestructive testing technology can be simply divided into two categories: surface nondestructive testing and near surface nondestructive testing. Surface nondestructive testing technology is a technology used to detect product surface defects, such as fluorescent penetrant testing. It can effectively locate cracks or other types of defects on the surface. Near surface nondestructive testing technology is used to detect defects below the surface. Including ultrasonic testing, laser testing and radiographic testing.

Industrial CT, as its name implies, is the CT equipment used in industry, especially in the detection industry. Compared with the previous testing industry, the biggest advantage of industrial CT testing is that it will not damage the samples, which is what we often call nondestructive testing. Of course, there are many ways of nondestructive testing, and industrial CT is only one of them. Briefly list the categories of nondestructive testing as follows: ultrasonic testing (UT), magnetic particle testing (MT), radiographic testing (RT) Penetrant testing (PT), eddy current testing (ET), visual testing (VT), acoustic emission testing (AE), leakage testing (LT), strain testing (st), thermal imaging testing (it), TOFD testing, metallographic testing... At present, national defense technology, aviation technology and large-scale are being developed. This technology is very important and has been widely used in aerospace, aviation, military, nuclear energy, oil and other fields.

X-ray testing andIndustrial CT detectionIt is the most commonly used solution in the field of nondestructive testing. Both methods use the principle that X-rays can penetrate materials to detect the internal structure of objects. X-rays have strong penetration and can pass through many substances that can not be penetrated by visible light. Therefore, using the characteristics of X-ray, engineers have developed various X-ray nondestructive testing equipment. Industrial CT is a new development direction with the development of computer technology and X-ray detection scheme. The so-called CT is three-dimensional X-ray scanning. During X-ray detection, the object to be measured is rotated 360 ° to collect the X-ray detection image of each angle, and then the solid image of the object to be measured needs to be reconstructed by computer operation.

Enterprises can choose X-ray nondestructive testing equipment according to the actual testing needs. Industrial CT can detect the defect location, size and size more accurately, which is suitable for the testing needs of high-precision products and help improve the product process. It plays an important auxiliary role in the R & D stage. X-ray detection is more often used in conventional production enterprises to distinguish defective products on the production line and online automatic detection to improve work efficiency and accuracy.

In recent years, its application and development in China are also very rapid. The use of industrial CT can detect the internal structure of the object non-contact and non-destructive, and get the data and images without overlap. It can not only accurately give the three-dimensional position data of the internal details of the object, but also quantitatively give the detailed radiation density data. Industrial CT nondestructive testing is more and more adopted by more and more large enterprises, and has become the most important development direction of nondestructive testing.