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18 Cards in this Set
- Front
- Back
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In longitudinal mode where will the defect fall?
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between the initial pulse and the back reflection
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In shear mode where is the first back reflection?
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bottom corner of the part
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In shear mode where is the 2nd back reflection?
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top corner of the part
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In shear mode where is the third back reflection?
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bottom corner of the part (same as the first back reflection)
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In rayleigh mode (surface) you move the transducer toward reflector until what?
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IP and the signal coincide
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When plotting a weld inspection, using low frequency L mode to inspect how much on either side of the weld?
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Three to six inches
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What frequency range is used for an s mode inspection for plotting a weld inspection?
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2.25mhz to 5mhz
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When evaluating discontinuity indications, how is location determined?
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by noting indications on CRT and comparing to known reflections
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When evaluating discontinuity indications, how is size estimated?
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by measuring signal amplitude.
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When evaluating discontinuity indications, how is orientation evaluated?
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if possible from several different directions using angle and straight beams
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What factors can cause loss of Back reflection and /or multiple indications?
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1) Large grain size
2) porosity 3) dispersion of precipitated particles in material 4) lowering frequency will generally reduce multiple indications |
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Delaminations in sheet or plates can be detected by noting what?
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a reduction in distance between back reflection multiples
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Surface wave indications will move toward initial pulse as search unit is what?
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moved toward the edge
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Surface waves can be generated when using what?
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straight beam search units
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Surface waves generated by straight beam search units can be what?
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mistaken for a discontinuity
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Straight beam used near a boundary causes reflection and mode conversion is called what?
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parallel boundaries
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What will a loose transducer element cause?
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a long ringing IP and will fail dead zone check
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The CRT will pick up external noise from where?
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electrical machinery and radar
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