ASNT Level III- Visual & Optical Testing

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Removal of loose surface particles is usually done by wetting a piece of acetate tape on one side with acetone, allowing a short period for softening and applying the wet side of the tape to the area of interest. Thicker tapes of 0.013 mm (0.005 in.) work best for such cleaning applications (thin tapes tend to tear). Following a short period, the tape hardens and is removed. This procedure is normally repeated several times until a final tape removes no debris from the surface. Charlie Chong/ Fion Zhang
5.1.2 Fracture Surface Analysis The topography of fracture surfaces can be replicated and analyzed using an optical microscope, scanning electron microscope or transmission electron microscope. The maximum useful magnification obtained using optical microscopes depends on the roughness of the fracture but seldom exceeds 100 x . The scanning electron microscope has good depth of field at high magnifications and is typically used for magnification of 10,000 x or less. The transmission electron microscope has been used to document microstructural details up to 50,000 x . In general, scanning electron microscope analysis of a replica provides information regarding mode of failure and, in most instances, is sufficient for completion of this kind of analysis. Charlie Chong/ Fion Zhang
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Page 5 and 6: Charlie Chong/ Fion Zhang Fion Zhan
Page 7 and 8: SECTION 4: BASIC AIDS AND ACCESSORI
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Page 21 and 22: Microstructural replication is done
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Page 25 and 26: Sputter deposition is a physical va
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Page 31 and 32: Sputter Deposition Charlie Chong/ F
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Page 39 and 40: FIGURE 59. Documentation of creep d
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Page 57 and 58: PART 6: TEMPERATURE INDICATING MATE
Page 59 and 60: Temperature indicating sticks were
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Page 63 and 64: 6.2 Certification of Temperature In
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6.3.2 Verifying Oven Temperatures T
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6.3.4 Process Control Applications
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6.3.6 Precise Post forming Heat Con
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Another example of handforrning is
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6.3.7 Pipeline Coatings Epoxy powde
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The most common use for temperature
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FIGURE 67. Temperature indicating s
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PART 7: CHEMICAL AIDS 7.0 General T
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7.1 Test Object Selection Figure 68
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7.2 Surface Preparation Preparation
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7.2.2 Removing Rust and Scale Rust
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If the required finish cannot be ac
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FIGURE 70. Example of contrast reve
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7.3.2 Safety Precautions Etchants a
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Etchant Safety Charlie Chong/ Fion
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Etchant Safety Charlie Chong/ Fion
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7.3.3 Containers Containers used wi
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1. add the acid or alkali to the wa
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7.3.6 Disposal Before disposing of
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7.4.2 Swabbing Etching may also be
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7.4.4 Test Object Preservation Rins
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7.5 Conclusion Visual testing is pe
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Cellulose Replica Sheets Charlie Ch
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Charlie Chong/ Fion Zhang
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ASNT Level III- Visual & Optical Testing

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