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| Describe X-ray NDT: |
Film is exposed to x-rays and developed. Dark areas indicate a possible defect. Does not indicate depth of defect. |
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CAVUMark Sat, 17 May 2008 22:43:23 GMT |
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| Eddy current NDT can be used on what materials? |
Not limited to material type. Composites are OK. |
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CAVUMark Sat, 17 May 2008 22:43:23 GMT |
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| Describe Eddy Current NDT: |
AC current builds up a magnetic field. A good part (baseline reference) and test part (differences) are needed for comparison. Test looks at Eddy current changes from good part to defective part. |
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CAVUMark Sat, 17 May 2008 22:43:23 GMT |
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| Describe Through-transmission NDT: |
A pulse is sent through the test part to a receiver on other side of part. Defects block pulse and reduces amount of energy transmitted. Training required. |
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CAVUMark Sat, 17 May 2008 22:43:23 GMT |
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| Describe Pulse-echo NDT: |
A pulse is sent through a part and the defect will appear via reflections, CRT indicated defects and approximate location. |
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CAVUMark Sat, 17 May 2008 22:43:23 GMT |
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| Describe Resonance NDT: |
Comparison technique which uses a good part to look for differences when a test part is resonated with sound. |
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| What are the 4 sound techniques for NDT? |
Tapping
Resonance
Pulse-echo
Through transmission |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Magnetic Particle Inspection. Disadvantages: |
Ferrous parts only.
Large machine needed.
Lots of power needed.
Expensive machine required. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Magnetic Particle Instpection. Name advantages: |
Detection to 1/2 depth of surface.
Somewhat cleaner than Dye Penetrate. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Slurry types magnetic particle detection are: |
Magnaglow for UV - white lines
Magnaflux - visual or daytime, red slurry with filing. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| When a part is held on end for magnetic particle inspection what direction are the lines of flux and what type of crack is best detected? |
Head shot - flux lines are Radial and an axial crack is easiest to detect. Think, Head, parallel lines of flux, perpendicular crack detection. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| When a coil is place around a part for magnetic particle inspection what direction are the lines of flux and what type of crack is best detected? |
Coil shot - flux lines are axial and a radial crack is easiest to detect. Think, Coil, straight lines of flux, perpendicular crack detection. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| What are the 2 Mag Particle inspection types? What are they called this. |
Coil shot - coil is place around part. Head shot - part is squeezed between two electrodes. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Describe Mag. Particle Inspection process. |
Set up machine and magnetize the part. Apply slurry with iron particle that indicate problems. Demagnetize by slowly removing from AC field. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| What problems can Magnetic Particle Inspection find. |
Cracks and issues down to 1/2 inch under surface. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| What material can Magnetic Particle Inspection be used on? |
Only iron based, must be able to be magnetized. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| What is Dye Penetrate used for and on what materials? |
Surface issues on plastic, glass or metal. Non porous materials. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Describe Dye Penetrate process. |
Apply Cleaner (Gross Clean)
Penetrate -gets in cracks.
Fine Clean - remove all but product in cracks.
Developer - Spot Check or Zyglo
Inspect |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Name the Dye Penetrate methods. |
Spot check for daytime visual. Zyglo for UV light use. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Describe Visual NDT. |
Eye ball... use mirror, flashlight, magnifying glass. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Describe Rockwell hardness testing |
Machine penetrates material and measures the depth. Returns a number for a scale referenced to kpsi. 100 Red Ball for lower kpsi scale is 0-130, 150 black Bralle for harder, scale is 0-100. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Describe Brinnel Hardness testing: |
machine places a small dent in metal and then measures diameter. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Two types of Hardness testing are |
1) Brinnel
2) Rockwell |
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| Toughness is |
withstands tearing, shearing and may be stretched or otherwise deformed without breaking. Hard but malleable, not brittle. |
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| Yield point is |
point at which a material does not return to original shape. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Elastic range is |
range where a given piece of metal will return to its original shape. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Ductility is |
ability to be drawn, bent or twisted without breaking. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Malleability is |
opposite of brittle. ability to tolerate deformation without failure, hammered or rolled pressed without cracking, breaking or some other detrimental effect. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Brittleness is |
inability of a material to resist bending or deformation without shattering.
Brittleness is directly proportional to hardness or strength. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Hardness is |
ability to resist abrasion, penetration, cutting action or permanent distortion.
Hardness is directly proportional to strength. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Metal properties: Strength is |
ability to resist stress or deformation typically measured in tensile strength or PSI |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Penetration stress is |
impact, short periods |
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| Bending stress is |
tension and compression. |
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| Torsion Stress is |
twisting or rotational stress. |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Shear Stress is |
cutting force |
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| Compression Stress is |
pushing together |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Tensile Stress is |
pulling apart stretching force |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Define Strain |
Results of Stress (applied stress) |
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CAVUMark Sat, 17 May 2008 22:43:22 GMT |
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| Define Stress |
Applied Force |
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