Penetrant Examination渗透检测.ppt

Nondestructive Inspection Liquid –penetrant examination Who can describe the PT? Definition:在被检工件 work/part 上浸涂可以渗透的带有荧光的或红色的染料，利用渗透剂 penetrant 的毛细作用，显示表面缺陷 surface?defects 痕迹的一种无损检测方法。 Teaching process Advantages of PT Principles of PT Essential Steps of PT What method is the penetrant drawn into the surface opening? New word in text Advantages of PT simple operation; low cost; apply to many materials; Principles of PT Essential Steps of PT Essential Steps of PT Surface Preparation Penetration Removal of Excess Penetrant Development Inspection What method is the penetrant drawn into the surface opening? New word in text Liquid-penetrant examination Capillary cleaner Pore Penetrant Developer Solvent cleaner Pressurized can Answer Some Questiong After Reading What is liquid-penetrant examination? What is the solvent cleaner used for? How is the penetrant drawn into the surface opening? What is the size of the tanks and individual stations governed by? Go on translating the text * Penetrant Examination 射线检测 RT（Radiographic Testing） 超声检测 UT（Ultrasonic Testing） 磁粉检测 MT（Magnetic particle Testing） 渗透检测 PT（Penetrant Testing） 涡流检测 ET（Eddy current Testing） Minute discontinuities open to the surface crack pore porosity weld 着色渗透探伤 weld HAZ crack 荧光渗透探伤 Capillary action 1.Liquid penetrant applied →2.Excess penetrant removed →3.Developer draws penetrant from crack →4. Observation 定义：渗透探伤剂是指penetrant﹑emulsifier ﹑cleaner、developer的总称。 各种探伤剂要配套使用，不能相互交叉替代 Surface Preparation→Penetration →Removal of Excess Penetrant →Development →Inspection 机械清理 化学清理 经预清洗后残余的溶剂﹑清洗剂和水分应充分干燥，并尽快进行下一步操作。如探伤工作量大，则可清洗一段，探伤一段，以避免间隔时间太长造成二次污染。 化学清洗结束后工件能不能直接进行渗透检测？ 滲透时间约10~15分钟 清洗处理都是必不可少的步骤 要注意的是：为了去除附着在被检工件表面的多余渗透剂，在处理过程中，既要防止处理不足而造成对缺陷识别的困难，同时也要防止处理过度而使渗入缺陷中的渗透剂也被洗去，用荧光渗透剂时，可在紫外线照射下边观察处理程度，边进行操作。 浸渍法 dipping 刷涂法 brushing 喷涂法 spraying 浇注法 pouring Advantages of PT Compared With MT 渗透探伤的优点是: ①检查对象不受材质限制 ②不受缺陷方向影响, ③不受被检工件几何形状影响 ④设备简单 Ferrous metal、nonferrous metal、glass 、plastics aluminum 、m