ASNT Level III- Visual & Optical Testing

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A core is prepared by first shaping the edges to be laminated. The core and laminate are evenly coated with a contact adhesive, preferably a spray. The laminate is positioned and registered with the core, allowing the laminate to overhang the radius. Postforming grades of decorative laminate are formable between temperatures of 156 and 163 °C (313 and 325 °F). A popular example of hand postforming is the 180 degree edge wrap. In this example, radiant heat is applied to the decorative surface of the laminate with the work supported over the heat. To determine the proper postforming temperature, the temperature indicating liquid is painted in stripes onto the laminate. When the liquid changes from a dry (matte) to a wet (melted) appearance, the assembly is wiped into the cavity of a fixture to form the 180 degree radius. The fixture is a U channel made by two boards attached to a base. The dimension of the U channel is the thickness of the core plus the thickness of the laminate, allowing about 0.5 mm (0.02 in.) clearance. Charlie Chong/ Fion Zhang
Another example of handforrning is known as a full wrap. In this application, the core is positioned over radiant heaters with temperature indicating stripes painted on the adhesive in the area of the radius. When the melt indicates forming temperature has been reached, the assembly is moved back onto a flat supporting surface. The wrapping action uses the flat surface as a pressure point. An example of mechanical postforming is the roll forming machine. Radiant heaters are located above an assembly supported by a moving carrier. When the forming temperature has been reached, slanted forming bars wipe the laminate over the radius. After the laminate has been formed, a succession of rollers maintains pressure until the assembly has cooled. In this application, temperature sensitive liquid is painted onto the laminate in order to verify that the dwell time under heat has been sufficient for reaching forming 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
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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
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 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: 6.3.6 Precise Post forming Heat Con
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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