The dye penetrant method of inspection is a nondestructive test for defects open to the surface. It may be used on such materials as aluminum, magnesium, brass, copper, cast iron, steel, stainless steel, carbides, stellite, certain plastics and ceramics. The essentials of the method are: penetration of the defect by the Dye Penetrant - removal of the excess Penetrant from the surface - development of the indication - inspection. A deep red indication will mark the defect. Surfaces should be free of foreign materials and paint. Grease, oils, etc. Scale, sand, dirt, etc.
Dye Penetrant Inspection
Dye Penetration Test: Advantages and Processes for Non-Destructive Testing
It can be used to inspect almost all non-porous materials such as metals, plastics, ceramics etc. This phenomenon occurs due to the molecular attraction. Procedure for Dye Penetrant Test can vary depending upon the factors such as the penetrant system being used and the condition and environment under which the inspection is performed. However, the general steps which are to be followed are as below;. Surface Preparation: The surface must be thoroughly cleaned, to make it free from dirt, oil, paint, grease, water, or other contaminants. For cleaning one can use dry cloth, solvents, cleaner, rust remover etc. Penetrant Application: After thorough cleaning, Penetrant is applied.
Dye Penetrant Inspection (DPI)
A dye penetration test is done to locate surface-breaking defects on ceramics, plastics, metals and other non-porous materials. As the name implies, this inspection method involves the penetration of dye into the surface defects and discontinuities. The dye or penetrant is applied through spraying, dipping or brushing. Then, the penetrant is removed and the developer is applied for visual inspection later.
The application of these testing methods by experienced technicians has been proven to give reliable information as to the shape and length of different defects that are open to surface. This can be very important when indications are noted and additional resources and techniques are needed to assess the overall condition of your component e. Phased Array Ultrasonic Testing. Many of the technicians employed by ECE Global are multi-disciplined and able to apply the other NDT disciplines that may be necessary to fully determine the suitability of the component for service. For applications where a greater sensitivity to smaller defects is required, the fluorescent penetrant method is preferred.