What is flaw detection?

Flaw detection, also known as flaw detection, refers to the detection of cracks or defects in metal materials or parts. \x0d\ Common flaw detection methods in flaw detection include: X-ray flaw detection, ultrasonic flaw detection, magnetic particle flaw detection, penetrant flaw detection (color flaw detection), eddy current flaw detection, gamma ray flaw detection and fluorescent penetrant inspection. \x0d\ where: \x0d\ magnetic particle inspection: \x0d\ Its basic principle is: when the workpiece is magnetized, if there is a defect on the surface of the workpiece, magnetic leakage will be generated due to the increase of magnetic resistance at the defect, forming a local magnetic field, and the magnetic powder will show the shape and position of the defect here, so as to judge the existence of the defect. Magnetic particle flaw detection is a detection method for detecting surface and near-surface defects of ferromagnetic materials. \x0d\ Ultrasonic flaw detection: \x0d\ There are many modes when ultrasonic waves propagate in the medium, and the most commonly used ones in detection are longitudinal wave, shear wave, surface wave and plate wave. Longitudinal wave can be used to detect defects such as inclusions, cracks, shrinkage cavities, white spots and delamination in metal ingots, blanks, plates, large forgings and simple parts. Shear waves can be used to detect circumferential and axial cracks, scratches, pores, slag inclusions, cracks, incomplete penetration and other defects in pipelines; Surface waves can be used to detect surface defects of parts with simple shapes; Defects in thin plates can be detected by plate waves. \x0d\ X-ray flaw detection: \x0d\ Ionization When X-rays or other rays (such as gamma rays) are absorbed by a substance, the molecules that make up the substance can be decomposed into positive and negative ions. This phenomenon is called ionization, and the number of ions is directly proportional to the number of X-rays absorbed by the substance. The number of X-rays can be calculated by measuring the ionization degree of air or other substances. This is how the inspection equipment realizes the flaw detection of parts. X-rays have other functions, such as sensitivity and fluorescence.