Penetrant examination is an effective and relatively low-cost method for locating surface-breaking defects on clean, fairly smooth, nonporous surfaces. Penetrant testing is widely used to detect surface-breaking flaws in both ferrous and nonferrous materials. A liquid penetrant examination is a testing method that supplement visual inspection, revealing defects that would be invisible or difficult to detect by the naked eye. It can be used both on-site or in a laboratory application with either color contrast or fluorescent techniques. In the laboratory, it is particularly suitable for the inspection of batch quantities of machined parts.
Penetrant examination reveals surface-breaking flaws in the form of bleed out of a visible or fluorescent dye. The technique is based on the ability of a liquid penetrant to be drawn into a clean surface breaking flaw by capillary action. After a period of time, known as dwell, excess surface penetrant is removed and a developer is applied. The developer draws the penetrant from the flaw to reveal its presence and produce a surface indication which under proper lighting conditions can be evaluated by a qualified inspector against applicable standards or per client’s specification.
At NCKEL, we utilize penetrant inspection on metallic and non-metallic specimens identifying various surface defects. Typical on-site applications include welds, castings, forgings, and structures. Our penetrant testing techniques detect the following defects:
We hold the following PT equipment: