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Principles and Applications of X-ray Nondestructive Testing
Release Date:
2022/01/15
X-rays possess extremely strong penetrating power; they are invisible to the human eye yet capable of passing through objects. With a certain degree of penetration, they can traverse many materials that are opaque to visible light, such as inked paper, wood, and electronic devices. As X-rays penetrate matter, their interaction with the material gives rise to a series of highly complex physical processes, resulting in absorption and scattering that cause the rays to lose some of their energy and consequently diminish in intensity. This phenomenon is known as X-ray attenuation.
The essence of radiographic testing is that differences in the degree of X-ray energy attenuation caused by variations between the test workpiece and its internal defect-containing media result in intensity differences in the X-rays transmitted through the workpiece. These intensity differences produce latent images on the photosensitive material (film) corresponding to the defect projections, which, after darkroom processing, yield defect images. The nature of the internal defects and the film classification are then assessed by comparison with standard reference materials.
The radiation range for X-ray nondestructive testing is generally 90 mm to 600 mm.
X-rays are generated by bombarding a metal anode target with high-speed electrons under high-vacuum conditions. The maximum steel thickness that can be penetrated by the X-rays emitted from an X-ray tube is approximately 90 mm, 230 mm, and 600 mm, respectively. X-rays can accurately detect internal defects in products and identify the root causes of these defects. After the penetrated product structure undergoes imaging, the resulting X-ray image—displayed on a fluorescent screen or television monitor—exhibits black-and-white contrast and distinct tonal gradations.
X-rays are classified as bremsstrahlung radiation and characteristic radiation, which arise from different excitation mechanisms. Bremsstrahlung radiation refers to the radiation produced when high-speed electrons undergo abrupt deceleration. When a charged particle is decelerated by a Coulomb field, the kinetic energy it loses is converted into photon emission, resulting in the continuous spectrum characteristic of bremsstrahlung radiation.
Nondestructive testing, or NDT, refers to inspection methods used to obtain physical and chemical information—such as the quality, properties, or composition—of a test object without altering its original condition or chemical characteristics.
Nondestructive testing technologies are now widely employed across various industrial sectors, including automotive manufacturing, scientific research, additive manufacturing, and the smartphone industry. These technologies can be used to inspect SMT solder joints in lithium batteries, IC packaging, IGBT semiconductors, and the bubble-to-void ratio in LED strip backlights; they also support BGA chip inspection, detection of porosity and welding defects in die-cast components, and nondestructive evaluation of internal structural defects in electronic products, among other applications.
X-ray nondestructive testing has a wide range of applications and delivers outstanding performance in areas such as materials testing, food inspection, manufacturing, electrical appliances, instrumentation, electronics, automotive components, medicine, biology, archaeology, and geology.
For example:
1. Aluminum Castings: In the field of nondestructive testing (NDT), casting inspection represents one of the most typical applications. The market for aluminum castings is growing steadily, particularly for critical safety components—for example, certain castings used in the automotive industry. Manufacturers of these components are obligated to assure their customers that their products meet stringent quality standards; however, porosity or other internal, hidden defects in aluminum castings can result in severe harm to end users.
A simple X-ray image can immediately reveal many of the root causes of defects. By employing an automated digital X-ray nondestructive testing system, 100% in-line inspection can be achieved, thereby realizing a zero-failure rate.
2. Malleable profiles: Ventilation holes in profiles are undesirable, as they can weaken joint areas or reduce the overall structural integrity of the profile. X-ray inspection, with its highly efficient non-destructive testing capabilities, makes it possible to ensure such quality.
3. Turbine Blades: Turbine blades are typically installed within specific flow passages (systems), through which cool air flows during operation. Due to their curved geometric configuration, it is extremely challenging to apply ultrasonic and other nondestructive testing techniques. In contrast, X-ray nondestructive testing systems can effectively detect damage or malfunctions in turbine blades within cooling systems.
4. For special equipment such as industrial boilers that operate under specified pressure and temperature conditions, even minor defects in welds or base materials can potentially lead to catastrophic explosion accidents. Radiographic testing, with its high degree of process maturity, enhances the safety and reliability of product components, thereby significantly boosting their market competitiveness. Moreover, since radiographic inspection produces two-dimensional images that depict defect characteristics, it provides a more intuitive representation of weld defects compared with other nondestructive testing methods.
In addition, owing to its accuracy, reliability, and ease of documentation, radiographic testing has been widely applied in numerous fields, including aerospace, power generation, defense industries, and mechanical engineering. Over the past century and more, radiographic testing has evolved from its original film-based radiography to a sophisticated inspection technique characterized by advanced digital technologies. Among these, CR (Computed Radiography) represents a rapidly advancing form of digital radiography that is non-film based. This technology leverages the ability of certain phosphorescent materials to retain latent image information: when these materials capture high-energy electrons, they form optically stimulated luminescence centers; upon laser excitation, the electrons in these centers return to their ground states, releasing energy in the form of visible light. The intensity of this emitted light is proportional to the radiation dose previously absorbed. Consequently, as a laser beam scans the phosphor imaging plate, a radiographic image can be obtained.
Researchers have never ceased exploring radiation detection technologies, and we are confident that, as these technologies continue to mature, they will be adopted across an ever-wider range of industries.
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