无损检测专业英语教学课件ppt作者晏荣明unit5LiquidPerantTesting课件.pptVIP

Part 2 Nondestructive Testing Methods第二部分 无损检测方法 Unit 5 Liquid Penetrant Testing 第五单元 渗透检测 5.1 Introduction Capillarity, or capillary attraction is the action by which the surface of a liquid, where it is in contact with a solid, is elevated or depressed. The materials, processes, and procedures used in liquid penetrant testing are designed to facilitate capillarity and to make the results of such action visible and capable of interpretation. 5.1 概论 毛细作用是作用在与固体接触的液体表面上的力，这种力使液体表面上升或下降。 渗透检测的材料、工艺和程序的设计都是为了促进毛细现象，并使这种毛细现象的结果可视、便于解释。 5.2 Theory and Principles 5.2.1 Surface wetting and contact angle Liquid penetrant tests for detection of surface discontinuities depend on the ability of the penetrant to enter the discontinuities and remain there as a penetrant entrapment. 5.2 理论和原理5.2.1 表面润湿和接触角 渗透检测能否检测到表面不连续性，取决于渗透剂进入不连续性并在不连续性中保留的能力。 5.2 Theory and Principles 5.2.2 Capillarity Nonetheless, penetration depth is still proportional to penetrant surface tension, and inversely proportional to crack width and penetrant density. 5.2 理论和原理5.2.2 毛细现象 然而，渗透深度正比于渗透剂的表面张力，反比于裂纹的宽度以及渗透液的浓度。 5.3 Testing system5.3.1 Visible Dye Penetrant Kit The visible dye penetrant test kit is light in weight and contains all the materials necessary for test. 5.3 检测系统5.3.1 着色检测工具包 着色渗透检测工具包重量轻，包括检测所需的所有材料。 5.3 Testing system5.3.2 Stationary equipment The stationary equipment used in liquid penetrant testing ranges from the simple to fully automatic systems and varies in size, layout, and arrangement depending on the requirements of specific tests. 5.3 检测系统5.3.2 固定式设备 渗透检测应用的固定式检测系统从简单型到全自动控制型不等，根据具体的检测要求，固定式设备在尺寸、布局和安排上调整变化。 5.3 Testing system5.3.3 Types of penetrants Fluorescent penetrants contain a dye or several dyes that fluoresce when exposed to ultraviolet radiation. Visible penetrants contain a red dye that provides high contrast against the white developer background. 5.3 检测系统5.3.3 渗透剂的种类 荧光渗透剂包含一种或多种染料，当暴露在紫外灯辐射下会发出荧光。 着色渗透剂包含红色染料，在白色的显像剂背景下可以得到很好的对比度。