(1) Characteristics of x-rays
X-ray is a kind of electromagnetic wave with a short wavelength. It is a kind of photon with a wavelength of 10-6~10-8cm. X-ray has the following characteristics: 1 penetration
X-rays can penetrate substances that are generally impervious to visible light. The strength of its penetration is related to the wavelength of the x-ray and the density and thickness of the material being penetrated. The shorter the x-ray wavelength, the greater the penetrating power; the lower the density, the thinner the thickness, the easier the x-ray will penetrate. In actual work, the penetration of the x-ray (ie, the mass of the x-ray) is determined by the magnitude of the voltage volt (kV) of the bulb, and the product of the current (mA) through the x-ray per unit time and time is multiplied by time. Represents the amount of x-rays.
2 ionization
When x-rays or other rays (such as gamma rays) are absorbed by a substance, the molecules constituting the substance are decomposed into positive and negative ions, which are called ionization, and the amount of ions is proportional to the amount of X-rays absorbed by the substance. The amount of x-rays can be calculated by measuring the degree of ionization by means of air or other substances. It is the detection equipment that detects the flaw detection of the part. X-rays have other effects, such as sensitization and fluorescence.
(2) Principle of image formation
The basic principle of X-ray image formation is due to the characteristics of the X-ray and the difference in density and thickness of the part.
Since the forming of parts varies with process parameters and machine conditions during the die-casting process, the thickness and density of the parts after molding are also different, and the amount of X-rays absorbed and transmitted by X-rays is not. same. Thus, there is a distinction between light and dark on the see-through screen.
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