ASNT Level III- Visual & Optical Testing

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7.4.3 Etching Time Etching time is determined by: 1. the concentration of the etchant, 2. the surface condition and temperature of the test object and 3. the type of test material (see Tables 16 and 17). During etching, the material surface loses its bright appearance and the degree of dullness is used to determine when to stop etching. Approximate dwell times are given in the table procedures but experience is important as well. Charlie Chong/ Fion Zhang
7.4.4 Test Object Preservation Rinsing, drying, de-smutting and coating may be required for preservation of the test object. Rinsing removes the etchant by flushing the surface thoroughly under running water. Cold water rinsing usually produces better surface appearance than hot water rinsing. Hot water rinsing does aid in drying. If smutting is a problem, the test object can be scrubbed with a stiff bristled brush or dipped in a suitable de-smutting solution. The test object should be dried with warm dry air. Shop air may be used if it is filtered and dried. After visual inspection, the test surface may be coated with a clear acrylic or lacquer but such coatings must be removed before subsequent tests. If the component is returned to service, a photographic record of the macro-etched area should be made. Charlie Chong/ Fion Zhang
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ASNT Level III- Visual & Optical Te
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At works Charlie Chong/ Fion Zhang
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Charlie Chong/ Fion Zhang Fion Zhan
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SECTION 4: BASIC AIDS AND ACCESSORI
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PART 4: MACHINE VISION TECHNOLOGY 4
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PART 6: TEMPERATURE INDICATING MATE
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PART 4: MACHINE VISION TECHNOLOGY 1
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5.1 Cellulose Acetate Replication A
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5.1.2 Fracture Surface Analysis The
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Replicas, in the as-stripped condit
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Microstructural replication is done
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If analysis with the scanning elect
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Sputter deposition is a physical va
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Sputtering http://en.wikipedia.org/
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Sputtering http://clearmetalsinc.co
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Sputter Deposition Charlie Chong/ F
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5.1.4 Strain Replication The replic
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FIGURE 56. Principles of acetate ta
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Fatigue striations Charlie Chong/ F
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FIGURE 59. Documentation of creep d
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FIGURE 60. Documentation of stress
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TABLE 14. Action required for creep
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Cellulose Acetate Replication http:
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Replication Microscopy Techniques f
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Replication Microscopy Techniques f
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5.2.1 Use of Silicone Replicating M
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FIGURE 63. Silicon replicas used to
Page 55 and 56: Brittle Failure Chevron Marking Cha
Page 57 and 58: PART 6: TEMPERATURE INDICATING MATE
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
Page 89 and 90: If the required finish cannot be ac
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
Page 97 and 98: Etchant Safety Charlie Chong/ Fion
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: 7.4.2 Swabbing Etching may also be
Page 109 and 110: 7.5 Conclusion Visual testing is pe
Page 111 and 112: Cellulose Replica Sheets Charlie Ch
Page 113: Charlie Chong/ Fion Zhang
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ASNT Level III- Visual & Optical Testing

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