ASNT Level III- Visual & Optical Testing

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5.3 Conclusion Cellulose acetate tape and silicone impression materials are commonly used for nondestructive visual tests of surface phenomena such as corrosion, wear, cracking and microstructures. Both types of replicating material have advantages and limitations but when used in the correct application, can provide valuable information. In terms of resolution, the silicone replica typically does not have the capability to copy fine detail above 50 x . The acetate replica can reveal detail up to 50,000 x on a transmission electron microscope. The acetate replica is limited, however, by the roughness of the topography it can copy. On rough fracture surfaces, difficulty is encountered in both applying and removing an acetate replica. The silicone material is not as restrictive in terms of the surface features it can copy. The need for fine, resolvable detail versus macroscopic features normally indicates whether acetate or silicone replicas are best for the application. Charlie Chong/ Fion Zhang
PART 6: TEMPERATURE INDICATING MATERIALS 6.0 General A temperature indicating stick (chalk or crayon) is typically made of materials with calibrated melting points and temperature measuring accuracies to ± 1 percent. Indicators are available in closely spaced increments over a range from 38 °C (100 °F) to 1,370 °C (2,500 °F). The workpiece to be tested is marked with the stick. When the workpiece attains the predetermined melting point of the indicator mark, the mark instantly liquefies, notifying the observer that the workpiece has reached that temperature. Charlie Chong/ Fion Zhang
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ASNT Level III- Visual & Optical Te
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At works Charlie Chong/ Fion Zhang
Page 5 and 6: Charlie Chong/ Fion Zhang Fion Zhan
Page 7 and 8: SECTION 4: BASIC AIDS AND ACCESSORI
Page 9 and 10: PART 4: MACHINE VISION TECHNOLOGY 4
Page 11 and 12: PART 6: TEMPERATURE INDICATING MATE
Page 13 and 14: PART 4: MACHINE VISION TECHNOLOGY 1
Page 15 and 16: 5.1 Cellulose Acetate Replication A
Page 17 and 18: 5.1.2 Fracture Surface Analysis The
Page 19 and 20: Replicas, in the as-stripped condit
Page 21 and 22: Microstructural replication is done
Page 23 and 24: If analysis with the scanning elect
Page 25 and 26: Sputter deposition is a physical va
Page 27 and 28: Sputtering http://en.wikipedia.org/
Page 29 and 30: Sputtering http://clearmetalsinc.co
Page 31 and 32: Sputter Deposition Charlie Chong/ F
Page 33 and 34: 5.1.4 Strain Replication The replic
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Page 37 and 38: Fatigue striations Charlie Chong/ F
Page 39 and 40: FIGURE 59. Documentation of creep d
Page 41 and 42: FIGURE 60. Documentation of stress
Page 43 and 44: TABLE 14. Action required for creep
Page 45 and 46: Cellulose Acetate Replication http:
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Page 53 and 54: FIGURE 63. Silicon replicas used to
Page 55: Brittle Failure Chevron Marking Cha
Page 59 and 60: Temperature indicating sticks were
Page 61 and 62: Levels of Charlie Chong/ Fion Zhang
Page 63 and 64: 6.2 Certification of Temperature In
Page 65 and 66: 6.3 Applications for Temperature In
Page 67 and 68: 6.3.2 Verifying Oven Temperatures T
Page 69 and 70: 6.3.4 Process Control Applications
Page 71 and 72: 6.3.6 Precise Post forming Heat Con
Page 73 and 74: Another example of handforrning is
Page 75 and 76: 6.3.7 Pipeline Coatings Epoxy powde
Page 77 and 78: The most common use for temperature
Page 79 and 80: FIGURE 67. Temperature indicating s
Page 81 and 82: PART 7: CHEMICAL AIDS 7.0 General T
Page 83 and 84: 7.1 Test Object Selection Figure 68
Page 85 and 86: 7.2 Surface Preparation Preparation
Page 87 and 88: 7.2.2 Removing Rust and Scale Rust
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Page 91 and 92: FIGURE 70. Example of contrast reve
Page 93 and 94: 7.3.2 Safety Precautions Etchants a
Page 95 and 96: Etchant Safety Charlie Chong/ Fion
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Page 99 and 100: 7.3.3 Containers Containers used wi
Page 101 and 102: 1. add the acid or alkali to the wa
Page 103 and 104: 7.3.6 Disposal Before disposing of
Page 105 and 106: 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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