Will wire brush electrodes insure good inspection even in corners and around irregular shapes where pinholes or bare spots (holidays) are likely to occur?
A7. Yes! PCWI Detectors can accommodate a complete range of brushes (see Brochure for illustrations). Q8. It is stated that under practical conditions, it is impossible to obtain an absolutely uniform thickness of an applied coating to a metallic surface, due to unevenness, mill scale or other surface blemishes. Using a “dry testing technique” by applying a high test-voltage to locate faults over the thickest section of the film, the thin areas of film could be ruptured due to excessive test voltage, even though these thinner film areas are perfectly homogeneous. Under these circumstances wet sponge testing utilizing a low voltage can be effective – True or false? A8. This is False! Rupturing will only occur if far too high a voltage is applied when testing. Passing the electrode over a test panel with similar (thinner) coating thickness will quickly determine whether the voltage is set to a level that will cause rupturing in the thinner areas.
Related Questions
- Will wire brush electrodes insure good inspection even in corners and around irregular shapes where pinholes or bare spots (holidays) are likely to occur?
- Can the TruckAds Frame be custom fitted around curves and irregular corners and angles?
- Why can’t I use a wire brush to roughen the surface when applying the mortar?
