渗透检测 PT

          PENETRANT TESTING PT

■检测原理:零件表面被施涂渗透液后，在毛细管作用下，经过一定时间，渗透液渗进表面开口的缺陷中。然后去除零件表面多余的渗透液，再在零件表面施涂显像剂，同样，在毛细管作用下，渗透液回渗到显像剂中，在一定的光源(紫外线或白光)下，缺陷处的渗透液痕迹被显示，从而探测出缺陷的形貌及分布状态。

Principle: After the surface of the part is applied with the penetrant,under the action of the capillary, the penetrant penetrates intothe opening defect after a certain period of time. Then removethe excess penetrant on the surface of the part, and apply thedeveloper on the surface. Similarly, under capillary action, thepenetrant is back-infiltrated into the eveloper.Under thesource(ultraviolet or white light), the penetrant traces at thedefect are displayed, thereby detect the morphology anddistribution of the defect.

■适用的检测对象:非多孔性材料及其制品。

Application: non-porous materials and their products.

■优点:原理简单易懂，设备操作简单，显示缺陷直观，对不规则零件也可进行检测。

Advantages: The principle is simple and easy to understand.the equipment is easy to operate,the defects display isintuitive, and the irregular parts can also be tested.