Dye Penetrant Inspection works well for a variety of product forms including castings, forgings and weldments. The structural steel, automotive, petrochemical, power generation and aerospace industries are a few examples of those that utilize liquid penetrant inspection.

Wet Blasting has become indispensable in MRO, with distinct advantages for DPI and other non-destructive inspection techniques.

Surface Cleaning and Prep 

Remove coatings and strip metal parts or composites clean and ready to accept Dye Penetrants and Developers. Dirt, paint, oil, grease or any loose scale could potentially keep penetrant out of a defect, or cause irrelevant or false warnings. Be sure that the test chemicals are compatible with the surface material to prevent permanent staining or surface degradation. Unlike dry blasting, wet blasting does not leave particles embedded in the surface, and won’t fill or hide discontinuities in the surface of the part.

Dye Penetrant Inspection Diagram

Removal of Dyes and Developers

After inspection, it’s imperative that any remaining chemicals are completely removed as they may be detrimental to the part life over time. Here again, wet blasting is a great way to clean and prep the surface for any necessary repairs.

Surface Finishing After Repairs

The distorting effects of force, and wear on the surfaces of parts, may require tip welding or other additive repairs. Wet blasting may be a good alternative to machining for restoring the geometry of parts that have been repaired by welding or LPM™. Wet blast equipment offers precise control in terms of the angle, abrasiveness and pressure required to accurately achieve the right dimensions, alignment and surface characteristics.


https://www.sciencedirect.com/topics/engineering/penetrant-inspection

https://www.liburdi.com/engineering-services-proc-powder-metallurgy

https://www.toprovelab.com/en/test/non-destructive-tests-penetrating-liquids