An automated system can automatically clean, etch, apply penetrant, emulsifier, rinse, dry the part, and apply the developer. High throughput can be achieved with minimal operator interaction can also be achieved in situ with a processing database that can provide an exact time-stamped history of all processes that were performed on a particular part and be stored for decades! REL specializes in communicating with plant-wide DCS systems that monitor processes throughout the manufacturing process.
Learn more about our Fluorescent Penetrant Inspection Systems. UV-A lights are used to inspect the surface for cracks as the penetrant moves to the surface of the part. Fluorescent Penetrant Inspection Process for Non-Destructive Testing Parts that undergo the fluorescent penetrant inspection process are typically Safety Critical Components in aerospace and automotive vehicles.
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Aggressive cleaning may remove dye from any cracks. Cleaners or solvents should not be sprayed directly onto the test piece, as the dye penetrant may be washed out of a porosity or fracture. After the excess dye penetrant is removed, the developer can be sprayed onto the test surface from 8 to 12 inches away. The developer will dry very quickly.
Two or three light coatings will normally suffice. It is important that the coats be applied so that they cover the piece evenly, are only slightly damp and dry quickly. Too heavy a coat may mask any flaw indications.
The test surface should be inspected immediately, then periodically during the next 20 minutes. Larger cracks and flaws will show up immediately, sometimes even before the developer is applied.
Tight, small fractures and fissures might take a few minutes to show up, as the tightly held dye penetrant takes more time to bleed through to the surface. Over a period of time, the line or spot that shows a flaw may grow enough that locating the exact problem becomes difficult. Thus, it is best to check the part often. Tight cracks will often show a series of inline small dots, while larger cracks will indicate as a continuous red line.
Porosity will reveal itself as a scattering of random red dots. There are several types of dye penetrant available, including some that show up under ultraviolet light, but the visible dye penetrant described here is the most versatile for DIY use. The kits are inexpensive and widely available from industrial supply outlets, machine shop supply stores and the Internet. Many years ago, a friend broke a brake rotor on a Civic—not a fast Civic, either, by modern standards.
We dye pen check some welds at work. Our certified weld inspector sprays the dye into a cup and uses a foam brush otherwise we spray it everywhere and it sucks to clean up. IIRC from my manufacturing days, dye pen only works on surface cracks, while mag particle Magnaflux, which is a brand name can find cracks or voids a little bit under the surface. Don't media blast the part before NDT. Blasting can peen the lips of the crack closed, hiding the anomaly.
The Dye should be all but cleaned up before applying the white powder; red, dwell time, wipe profusely, then clean it again to almost bare looking, then the white to draw the dye out of the hiding spot. The dye penetrant testing is done on electrical insulators, plastic pipes, plastic bearing and plastic gears, etc. Both color contrast dye and fluorescent technique are used for plastics. Since the plastic dye penetration test is done on the production line, the water washable penetrant and post emulsification widely is used.
These plastic components can be placed in the cleaner bath and then dried and placed on dye penetrant bath and after elapsing dwell time can be subjected to rinsing with water or go to the post-emulsification depending on the procedure. Then subjected to the developer either with spraying or by immersing on the developer bath.
The acceptance criteria that being indicated in approved procedure should be used for interpretation. Specific attention should be performed to not confuse with the false indication. The standard penetrant material cannot be used for plastic material since might attack the plastic with chemical reaction, etc. The liquid penetrant material should be compatible with the tested objects.
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