FLAWTEK NDT Dye Penetration Crack Detection
THE FLAWTEK three-stage dye penetrant inspection pack is a simple inspection method used to locate surface-breaking defects in metals. It is commonly used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity and leaks in new products. It can also be used to detect fatigue cracks on in-service components without the need to completely dismantle products.
Here is how to use the three pack system:
Clean the surface Spray on safety cleaner (pack 1) and wipe thoroughly with a lint-free cloth or tissue to remove all surface contamination, then apply the penetrant. Parts must be at ambient temperature (between 5˚C and 35˚C) before penetrant is applied. Spray the area under examination liberally with
the penetrant (pack 2) and allow at least ten minutes of contact time. If very fine defects are to be located, extend the contact time to twenty minutes.
Clean off the penetrant Remove most of the penetrant by wiping with a lint-free, absorbent cloth. To complete removal, use a lint-free cloth soaked in safety cleaner (pack 3) and dry thoroughly.
Apply developer Apply developer by spraying on a thin, even film at least ten minutes before inspecting for fine defects. Inspect in daylight, good artificial illumination or under ultra violet light, as appropriate, so that the system will show continuous lines or pinpoints where there are cracks or porosity. See diagrams opposite for more information.
For further details, contact Weldability Sif on +44 (0)845 130 7757 or e-mail:
training@weldability-sif.com ■
4. Remove excess penetrant from part surface with a cloth.
3. Allow proper dwell time of 10 minutes or, for fine defects, 20 minutes.
2. Apply penetrant to surface by spraying or brushing. 1. Pre-clean with cloth dampened with solvent.
Technical advice in the original SifTips style was started in 1932. ‘Sifbronzing’ is an almost universally recognised way of describing the low temperature bronze welding of sheet steel, cast iron and other metals. This explains why Sifbronze, the company which first developed and promoted the technique, is generally considered to be a supplier of high quality welding rods, wires, fluxes and equipment. ‘Will the Welder’ was
a SifTips magazine that was produced in the early 1930s. The aim was to provide users with ideas and tips on how to get the most out of their welding equipment. In 2007, Weldability-Sif
acquired Sifbronze, the welding consumables division of the Suffolk Iron Foundry, known internationally as Sif. Sif is renowned for its UK manufacturing heritage as well as its complete range of quality welding consumables for MIG/GMAW, TIG/GTAW, Arc/SMAW, Oxy/Fuel Welding and Brazing which have been used globally for almost a century.
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5. Apply developer and allow a dwell time of 10 minutes. Then inspect for flaws.
SIF TIPS
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