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在石化系统的中高压容器检定中,常遇到壁厚较大、外径不等、内部结构复杂的设备。如用射线检测,则须分解内部附件,并受到焦距和检验周期的限制。因此,较多设备的纵缝须用超声波检测。但有些设备外径较小、壁厚较大,探伤时较难准确测定缺陷的位置,给安全评定和返修带来困难。如在现场用曲面修正法进行计算,极为费时,还会影响进度。为此,我们结合以往工作经验,将检验中常涉及到的各设备参数汇集、筛选、输入电脑,利用微机来解决不等参数的设备。从而为探伤人员提供了各种曲率半径设备的较统一的定位参数,为探伤规范化奠定了基础,还为检验质量和设备的安全运行提供了保证。 1 程序设计的方法与依据 根据超声波检测原理和要求,为使主声速轴线能在外圆周检测柱曲面时扫射到工件内壁,所选用探头入射角的正切值K,其检测范围是根据图1所示来确定的。
Medium and high pressure vessel in the petrochemical system test, often encountered larger wall thickness, diameter, internal structure of the complex equipment. If using ray detection, the internal accessories must be disassembled and subject to the focal length and inspection cycle. Therefore, more equipment longitudinal seam ultrasonic testing. However, some devices have a small outer diameter and a large wall thickness, and it is difficult to accurately determine the location of flaw during the flaw detection, which brings difficulties to safety assessment and rework. If the surface correction method used in the calculation, it is extremely time-consuming, but also affect the progress. To this end, we combine the past work experience, the test often involved in the collection of equipment parameters, screening, enter the computer, the use of computer to solve unequal parameters of equipment. Thus providing the testing personnel with more uniform positioning parameters of various curvature radii equipment, laying a foundation for the standardization of testing and testing and also guaranteeing the quality and safety operation of the equipment. A program design method and basis According to ultrasonic testing principles and requirements, in order to make the main sound velocity axis can detect cylindrical surface of the outer cylinder when the workpiece wall, the selected angle of incidence of the probe tangent value K, the detection range is shown in Figure 1 To determine.