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24 Cards in this Set
- Front
- Back
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What is the main purpose of the radiographic inspection technique?
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to provide repeatable step by step procedures giving uniform results
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If surface discontinuities are of a magnitude to be considered detrimental to the function of the part,how should they be evaluated?
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visually or by other NDI methods that are more economical than radiography
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What are the three most common reasons for radiography?
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castings, welds and service inspections
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Castings account for a considerable share of what?
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the critical components of an aircraft, usually made of aluminum and magnesium
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Most metal can be readily detected, they consist of a what?
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change in the material's homogeneity
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Cracks will occur in the direction of the thickness of the plate and will be what to the X-ray beam?
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Parallel
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Stresses created in the metal by welding and not accompanied by a physical separation of material will not be what?
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detected by radiography
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How do Tungsten inclusions appear on the radiograph?
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shiny, bright white specks due to the very high absorption of radiation by tungsten
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Is there a difference in the way a weld is inspected due to different material types?
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No
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What are the five geometric factors when developing a technique?
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1) focal spot 2) SFD 3) beam to film alignment 4) film to object distance/contact 5) object object to film alignment
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What is the first consideration when developing techniques?
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material type
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If the material is not compatible with the exposure chart what must be done?
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a conversion has to be made
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What is the second consideration for developing a technique?
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material thickness
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For a structural makeup of "Z" and "L" channels, how must the thickness be measured?
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compute one flange thickness
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For a structural makeup of "C" and "I" channels, how must the thickness be measured?
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compute two flange thicknesses
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What must be understood about measuring total material thicknesses?
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That there is a difference between total part thickness and total material thickness
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For solid part the angle of the X-ray is determined by what?
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Geometry of the part and suspected location of the defect
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For Hollow parts the angle of the X- ray is determined by what?
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by the overall part thickness
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If the part thickness is 2" or greater what should the angle of the X-ray be?
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37 degrees
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For every 1/2" under 2" the angle is increased by how many degrees?
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5 degrees not to exceed 52 degrees
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The exposure time will increase how much more than a normal 90 degree shot for a angle shot?
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10% more to the final calculated exposure time
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In order to properly record the image the film must be shifted to overall thickness of the part not to exceed how much?
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3 inches
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What is the third consideration for developing a technique?
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calculate exposure kV under 1000 mAs to use a exposure KV
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What form is used to record a technique?
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AFTO Form 242
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