ASNT Level III- Visual & Optical Testing

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6.3.1 Tests of Railway Bearings Bearing breakdown can be detected by using fluorescent temperature indicating pellets as heat sensors for inboard journal boxes. The pellets are inserted in a specially fabricated stainless steel holder that contains two pellets. The holder is inserted into the hollow axle of each rail car with an insertion tool. The tool has a mechanical stop to ensure that the holder is located at a predetermined depth. This permits proper monitoring of journal box operating temperatures. Once a specified temperature is exceeded, in this case 100 °C (212 °F), the pellets melt and flow completely out of the holder. The fluorescent material is easy to detect and clearly indicates that excessive heat has been conducted from the bearing to the axle. Charlie Chong/ Fion Zhang
6.3.2 Verifying Oven Temperatures Technicians can determine if self cleaning ovens reach the proper cleaning temperature using pellets with pre-calibrated melting points at 450 °C (850 °F). The pellets are placed on a flat piece of aluminum foil situated on the oven's center rack (see Fig. 65). The cleaning cycle is activated and as the temperature reaches 450 °C (850 °F), the pellets begin to melt. When the cleaning cycle is completed and the oven has cooled, the pellets are inspected—complete melting of the tablet verifies that the nominal cleaning temperature has been achieved. 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
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
Page 35 and 36: FIGURE 56. Principles of acetate ta
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:
Page 47 and 48: Replication Microscopy Techniques f
Page 49 and 50: Replication Microscopy Techniques f
Page 51 and 52: 5.2.1 Use of Silicone Replicating M
Page 53 and 54: 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: 6.3 Applications for Temperature In
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 and 106: 7.4.2 Swabbing Etching may also be
Page 107 and 108: 7.4.4 Test Object Preservation Rins
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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