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随着我国石油工业的飞速发展,液化石油气钢瓶在工业生产、日常生活中应用日益广泛。为了保证安全使用,制造单位和用户对钢瓶的质量检验日益关注,需要一种既迅速又可靠的检验手段。液化石油气钢瓶是由钢板冷冲压加工、加温消除应力,将两个冲压半球焊接而成的。从制造工艺、使用过程的受力分析以及检验经验和破裂状况来看,钢瓶环焊缝和接近焊缝的母材是最容易出现缺陷和最薄弱的环节。一般来说,对钢瓶的无损检验实际上就是指对这个区域的检验。磁力探伤原理在磁场中,磁性的金属比其他物质(空气、非金属等)导磁能力大得多,也就是说工件中的裂纹、气孔、夹渣物比铁磁性工件的磁阻大得多。这些缺陷造成工件中导磁的不均匀性,使工件内的磁力线弯曲,绕过
With the rapid development of China’s oil industry, liquefied petroleum gas cylinders are increasingly used in industrial production and daily life. In order to ensure the safe use, manufacturing units and users are paying more and more attention to the quality inspection of cylinders, and a rapid and reliable test method is needed. Liquefied petroleum gas cylinder steel cold stamping process, heating stress relief, the two stamping hemisphere welded together. From the manufacturing process, the use of force analysis and test experience and the status of rupture point of view, the cylinder ring weld and the base metal near the weld is the most prone to defects and the weakest link. In general, non-destructive testing of cylinders actually means testing of this area. Magnetic detection principle In the magnetic field, magnetic metal than other substances (air, non-metallic, etc.) permeability is much greater, that is, the workpiece cracks, pores, slag than the ferromagnetic magnetoresistance much greater . These defects cause the inhomogeneity of the magnetism in the work piece, make the magnetic flux in the work piece bend, bypass