NDI using penetrant
NDI using penetrant
(OP)
We have an item made from aluminum (6061-T6) that needs a dye penetrant inspection. The problem is that the person that prepared the part for inspection stripped all the coatings off using media blasting. As a result, it is not possible to perform the inspection properly because of all the impacted residue. Can anyone tell me how we can now clean the surfaces in preparation for penetrant?
thanks
thanks
RE: NDI using penetrant
Regards,
Cory
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RE: NDI using penetrant
RE: NDI using penetrant
RE: NDI using penetrant
was used and at what pressures. If you truly have impacted media such as glass or steel you will need to remove around .0015/.002" of material from the surface of the part to perform viable liquid penetrant inspection. This could be done mechanically or chemically or a combination of both. Please tell some more about the part and details of the blasting..media...pressure. Also about the part, machinement, weldment, casting.....Also specify if the part is tight tolerance, as removing material will invariably change size.
RE: NDI using penetrant
RE: NDI using penetrant
you might consided eddy current surface scan which may be more reliable to dye pen. Think of dye pen as a visible indicaton of a crack (it just enhances the visible inspection). Look into eddy current inspection methods.
RE: NDI using penetrant
if the fixture is proofloaded, will any cracks open back up and allow a valid dye penetrant test?
RE: NDI using penetrant
Unfortunately, the answer is possible, and not a definitive yes. I would not rely on a proof test to validate a liquid penetrant examination of a welded component.
If the NDT was specified or required prior to proof loading and after, you need to prepare the surface for liquid penetrant testing by using one of the methods mentioned above to assure proper technique was followed both before and after. Do you have a procedure for conducting liquid penetrant testing? If not, you are at great risk of missing surface flaws.
RE: NDI using penetrant
The main problem is that since this item doesn't require regular proof loading, we have no fixture to perform the proof load. Therefore, we either get creative, pay for a fixture to be fabricated, or pay for an acid dip.
RE: NDI using penetrant