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197 Cards in this Set
- Front
- Back
Magnetism?
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The ability of matter to attract matter to itself.
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Magnetiization?
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The process by which elementary magnetic domains of a material are alighned predominantly in one direction.
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magnetic domains?
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Materials that can be magnetized possess atoms that group into submicroscopic regions.
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Un-magnetized domains are aligned how?
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They are randomly oriantated.
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Magnetized domains are aligned how?
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The are align themselves parallel with the magnetic field.
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poles are attacted to earths magnetic pole and are therefore called?
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North and south pole.
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Objects are magnetized when part or all of its molecules are what?
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Aligned
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This quality of having two opposite magnetic poles is called?
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Polarity
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A conceptual representation of magnet flux that can be illustrated vy the line pattern produced when iron fillings are sprinkled on paper laid over a permanent magnet?
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Mangetic lines of force.
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The strength of the magnetic field is?
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field intensity
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represents the level of magnetism or?
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flux density
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flux lines are proportional to the what?
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amount of magnetism in parts
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What seeks a new path around surface cracks due to high reluctance of air?
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magnetic flux lines
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when a magnetic field is inturupted by a discontinuity?
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leakage field
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the stronger the leakage field the what?
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The closer the discontinuity is to the surface.
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magnetic fields must be in a faborable direction with respect to a discontinuity to produce an indication. This is called what?
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effects of flux direction
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Best results for inspecting discontinuities are optained when?
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flux lines are perpendicular to it.
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when magnetic field has little or no effect on the material?
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Diamagnetic
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when magnetic field has some effects on the material?
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paramagnetic
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when magnetic field has great effect on the material?
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ferromagnetic
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what procedure do you clamp the part between the contact plates to induce circular field?
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circular magnetism1
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what is used for hollow parts?
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Central conductor bar
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Why do you do circular magnitization first?
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because you can not verify magnetization or demag
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when parts are placed in a coil you are doing what?
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longitudinal magnetization
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In lognitudinal magnetization poles run?
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South to north inside the part.
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what kinds of magnets have longitudinal fields?
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BAR
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ease of a magnet to be magnetized is know as?
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permeability
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ease of magnetization indicates?
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high permability
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difficulty of magnetization indicates?
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low permability
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Property of a metal to retain magnetic FIELD after the magnetizing force has been removed.
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retentivity
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metals with strong magnetic fields have high?
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retentivity
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Low retentivity means what?
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the part loses most of its magnetizim
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magnetism remaining after a magnetic force has been removed?
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residual magnetism
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chemical properties and size and shape of the material determine what?
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The amount of residual magnetization.
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what is reluctance?
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The resistance of a material to establishment of magnetic flux.
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negitive or revers magnetizing force used to reduce magnetic field?
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coercive force
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If magnetic force is reversed and gradually removed what will happen?
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magnetism will diminish.
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What is electrical current used for?
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is use to induce or creat magnetic fields in parts.
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what type of current as a single phase or multipule phase?
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A/C
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what type of currentis used for surface detections?
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A/C
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DC is the bes sourced of?
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Best sorce of rectified A/C
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If you are doing 100% inspection what type of current will you use?
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D/C
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When an electrical current is passed through a conductor what happens?
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a magnetic field is formed arount the conductor.
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Amount of electrical current determines the amount of what?
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amount of strength it will have
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the stength in a coil conductor is determined by?
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The amount of loops
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The H-710G Is?
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Horizontal stationary inspection unit.
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H-710G uses what type of partical application?
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Wet partical only!
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KCH-3D IS WHAT?
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a MOBILE UNIT
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What type of partical application does the KCH-3d use?
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Wet or dry
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What are the duty cylces for a KCH-3d?
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0-600 amps continous use
600-1200 amps 3 min on-5min off 1200-2000- 1 min on 5 min off 2000-3000- 1 min on 10 min off These are all for AC |
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DC output duty cycles for KCH-3D?
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0-1250- continous
1250-2000- 1 min on 5 min off 2000-3000- 1 min on 10 min off |
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DA-200(parker probe) and the TTU-432/E are used and transported how?
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Used on ship or shore and are hand carried.
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The DA-200 and the TTU432E use what type of partical applicaltion?
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Wet or dry
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The DA-200 and the TU432E are powered by?
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single phase HWRAC
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The DA-200 and the TTU432E use what type of current for Demag?
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AC withdraw for both
AC decay for the TTU432E |
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DA-200 is what type of device?
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Yoke type that only provided logitudinal.
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How due you apply dry particals?
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by hand with a rubber squeeze bulb or plastic squeeze bottle.
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How do you apply wet particals?
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bath or aerosol
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What is the residual method of application for particals?
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apply power, stop power, apply bath, stop bath
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apply bath, apply power, stop bath, stop power is what type of method.
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continous which is the most common.
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what is the amps for a uniform and cylindrical in shape?
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300-800 normally 500
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low permeability alloys or inclusions amps would be?
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800
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the greatest two distances on the outside of the part are?
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the distance.
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What formula do you use to find the wall thickness?
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(cbc)+2(wt)=D
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what formula do you use to get your head shot?
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Diameter x type steel.
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what formula do you use to determain the number of turn?
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c
----- 4(CBC) |
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How do you determain your circumfrence for your CBC turns formula?
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ID X pie
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Why is it critical to determain the cross sectional area of a part compared to the cross sectional area of the coil?
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So that you know if the part goes on the bottom or centered in the coil.
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What is the formula to find the area of the coil?
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A=pie X Rsq
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for the area of a rectangle or square part you would use what formula?
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A=H X W
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If the cross sectional are of the part is less than 10% of the coil area where does your part go
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bottom of the coil.
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when your parts cross sectional area is greater then the area of the coil your part goes?
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centered in the coil
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What formula do you use to find the affective diameter of a hollow part?
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draw it!
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Length to diameter ratio as to be greater than or less than what.
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Greater than 2in or less then 15in if its over you use 15 if its under you use extension.
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magnetizing fields extend how far from the center of the part?
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6-9 inches
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what is the amps for a uniform and cylindrical in shape?
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300-800 normally 500
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low permeability alloys or inclusions amps would be?
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800
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the greatest two distances on the outside of the part are?
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the distance.
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What formula do you use to find the wall thickness?
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(cbc)+2(wt)=D
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what formula do you use to get your head shot?
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Diameter x type steel.
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what formula do you use to determain the number of turn?
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c
----- 4(CBC) |
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How do you determain your circumfrence for your CBC turns formula?
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ID X pie
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Why is it critical to determain the cross sectional area of a part compared to the cross sectional area of the coil?
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So that you know if the part goes on the bottom or centered in the coil.
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What is the formula to find the area of the coil?
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A=pie X Rsq
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for the area of a rectangle or square part you would use what formula?
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A=H X W
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If the cross sectional are of the part is less than 10% of the coil area where does your part go
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bottom of the coil.
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when your parts cross sectional area is greater then the area of the coil your part goes?
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centered in the coil
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What formula do you use to find the affective diameter of a hollow part?
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draw it!
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Length to diameter ratio as to be greater than or less than what.
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Greater than 2in or less then 15in if its over you use 15 if its under you use extension.
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magnetizing fields extend how far from the center of the part?
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6-9 inches
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why is it critical to determine the relationship between the cross sectional area of the part and the cross sectional area of the coil?
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So that you know where to put your part inside the coil?
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to find the area of the coil and the part what formula would you use or circuar areas?
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draw it/say it.
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To find the area of a square what formula do you use?
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draw it or say it
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for the part to be on the bottom the cross sectional area of the part has to be less than what
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10%
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What formula would you use to find the effective diameter of a circle and a square?
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draw it
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(L/D) determines what?
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The effective are of the field distance.
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Your length to diameter as to be in between a ratio of what. If its over or under what do you do?
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Between 2-15 in. Over you use 15 and under you use extensions.
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the useful magnetizing field extends how far in the coils?
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6-9in for the center line each way
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How much over lap do you need for if your part is 60 inches and how many times would you shot it?
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Its to big you would have to do a cable wrap.
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What is the formula for a part lying in bottom of coil?
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draw it
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whatis the formula for centering a part in the coil?
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draw it
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what is the formula for cable wrap?
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draw it?
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What is the purpose of demagnetization?
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to reduce the magnetic field retained in the part.
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Aircraft ferromagnetic parts are demaged when?
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part is installed on a/c
part needs further machining welding is involved ball bearings or gear teeth effects coating prevents proper cleaning |
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mangetic fields do what continously>
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reversing and decreasing at the same time
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decreased magnetism is accomplished by?
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smaller and smaller hystersis loops created by decreasing currnet.
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The smaller the hysteresis loop produced the more what?
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Demag that has been accomplished.
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what type of dmag is more comvienent but does not penetrate very deep below the surface?
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AC
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What kind of demage works well on larg parts?
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AC step down. and AC decay
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AC coil withdraw is more suitable for what?
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Small parts and larg numbers of parts.
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What type of dmag is the most complete and affective?
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DC Multi point reversing step down
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when dmaging you want to get the residual to what?
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the lowest posible level.
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a part is considered to be satisfactorily demaged when its mag field is at or be low how many gauss meter or below what for the feild indicator?
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3 and 2
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what is the most accurate way to messure residual magnetism?
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Field indcator
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when do you have to have your part lying east to west for mesuring residual?
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when you use a compass indicator.
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What are the six things you need to learn about a part when you recive it?
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alloy, shape, size, surface condition, permability, and retentivity
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what type of partical insures a complete coverage, partical mobility, and indicates tight defects?
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WET
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Wet partical charachteristics?
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globular/round
.0002-.006 in color |
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what collor is visible particals?
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Black or red
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what is the only authorized partical type for A/C?
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Wet flourecent
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what type of partical is considered superior in detecting subsurface discontinuities but lacks mobility and are harder to apply?
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DRY
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dry partical charachteristics?
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elongated rod shaped
.002-.006 in gray, black, red, or yellow |
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what are the two different directions of magnetic fields?
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longitudinal or circular
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When using a mag bench what do you stand on?
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isulating floor matting rated for the voltage of equipment
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what is the Need for process control?
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MAG partical is not a fail safe method.
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what are two reasons flaws can be present and not indicated?
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substandard material or equipment and process diviation
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What is the primary reason for material degradation>
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contamination
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What are the 5 things that cause material degradation>
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water, organic coatings, organic solvants, dirt, soil , other insoluble materials, and acid an alkelines.
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At what temp does heat degradation cause flourecents to go bad and what temp destroys them?
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140 and 250 degrees F
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material contamination, equipment malfuction, and procedure diviation are what?
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Directly porportional to the no of parts inspected.
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why are minimul test schedules set?
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Due to the lake of uniformity of work load.
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new material needs to be what be for put into service?
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tested
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You perform a petroleum based vehicle contamination check prior to what?
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mixing inspection bath
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petroleum based vehicles have to sit for how long before performing a check?
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1 hour in original container
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how do you inspect for flourecents you your petroleum?
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with a black light
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How do you perform a bath contamination check?
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using a cetrifuge tube
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partical contamination about recommended levels could cause what?
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excessive background indications and below limits may miss defects.
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what do you have to test daily and after 8 hrs of continuous use.
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your bath
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when using the centifuge tube how do you messure fluorecent consentration and the visible particle concentration
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.1-.4 for fluorecent
1.2-2.4 for visible |
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petroleum based contamination check is performed when?
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prior to each use at least once each day.
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examain fluid in centrifuge tube it should not do what?
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should not fluorece
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pet contamination should not exceed what?
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30% of bath concetrate
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background fluor check should be performed when?
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Prior to each use and after every 8 hrs of countinious use.
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what tool is used to check stationary voltage?
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keto tool
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how often do you check AC/DC on a stationary unit?
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every seven days
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perform amperage inticator accuracy check when?
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Every six months
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perform quick break check every?
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60 days
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what is a quck break check for?
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checks rapid colaps of magnetic field
tested at 2000 amps for .5 sec. |
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ded weight lift check is done?
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every 30days
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dead lift check is performed on what?
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electromagnetic yokes DA-200
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interpretation
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determination of what causes and indication
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surface indications are usually?
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well defined build up of particals
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subsurface defects are indications are usually
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broad and fuzzy
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Surface discontinuites are more harmfull then?
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subsurface
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Sharp discontinuies such as fatigue cracks and grinding cracks are more harmful then
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rounded discontunities
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discontinuities weather surface or subsurface that lies at a right angle to applied stress is more likely to be harmful then?
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one that lies parallel to applied stress.
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Classify deffect indications?
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A-positive defect
B-questionable C-No defect SD-surface defect |
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what is an extension of the magnetic particle inspection method used for detecting flaws in problem areas?
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mag rubber inspection
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What is manetic rubber inspection used for?
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areas with limited visual accessability.
coted surfaces complex shapes and edges |
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MRI procedures?
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obtain material, clean area, remove surface inperfections, form resevior dam.
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MRI mixing and measuring?
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must be mixed good with no streaks or color variation.
messure one gram runbber bas equals on cubic centimeter base material |
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Perferred magnetizaion method for MRI?
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DC portables.
May also use mobile or stationary. stationary has limited use. |
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Defect to field orientation. when using portable equip?
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Pour mixed materials
mag in one direction wait 60 sec rotate probe 90 degrees and remag allow to cure. |
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what do use use to examine MRI indications
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7x - 10x illuminated magnifing glass.
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Classify deffect indications?
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A-positive defect
B-questionable C-No defect SD-surface defect |
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what is an extension of the magnetic particle inspection method used for detecting flaws in problem areas?
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mag rubber inspection
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What is manetic rubber inspection used for?
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areas with limited visual accessability.
coted surfaces complex shapes and edges |
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MRI procedures?
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obtain material, clean area, remove surface inperfections, form resevior dam.
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MRI mixing and measuring?
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must be mixed good with no streaks or color variation.
messure one gram runbber bas equals on cubic centimeter base material |
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Interpretation?
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Determination of what causes a indication.
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Surface indications?
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Well defined build up of particals.
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Subsurface indications?
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Usually broad and fuzzy
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Surface discontinuities are more harmful than?
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Subsurface.
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You should perform and amerage indicator accuracy check how often?
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at least once every 6 mon.
Check for proper output |
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Quick break check is performed when?
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Every 60 days.
Check for rapid collaps of magnetic field. Check using 2000 amps for .5 sec. |
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Dead weight lift check is performed on what unit?
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DA-200 parker probe.
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Dead weight lift check is performed how often?
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Every 30 days
Checks for proper AC and DC |
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What are the inspection procedures for Dead weight check For AC and DC?
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For AC space legs of yoke two to four inches aprt place 10 lbs weight and lift weight with unit engaged.
For DC Use 30 lbs weight. for 40-50 lbs test spread legs 4-6 inches apart. |
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magnetic partical inspection includes exposure to?
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oil, pastes, and electrical current.
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What is the need for process control?
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MPI is not a fail safe process.
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Flaws can be present and not indicated for a number of reasons name two?
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Substandard materials either new or through service degradation or process diviation in equipment procedures or condition.
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New material must what before use?
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tested
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petroleum based vehicle check done when?
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prior to mixing inspection bath.
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before performing pet base vehicle check it must sit for how long?
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1 hour
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in use bath concentration camp?
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used to insure proper particle to bath ratio.
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Bath concentration check is done when?
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Performed daily and after 8 hours of consecutive use
Flourecent particals should be .1-.4 and 1.2-2.4 for visible particals |
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pet based contamination check is performed when?
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Prior to use at least once a day.
Contamination will not fluorece. Contamination shall not exceed 30% |
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background flourecenet checkshall be performed when?
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Prior to each day and after every 8 hours of continous use.
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before performing pet base vehicle check it must sit for how long?
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1 hour
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in use bath concentration camp?
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used to insure proper particle to bath ratio.
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Bath concentration check is done when?
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Performed daily and after 8 hours of consecutive use
Flourecent particals should be .1-.4 and 1.2-2.4 for visible particals |
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pet based contamination check is performed when?
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Prior to use at least once a day.
Contamination will not fluorece. Contamination shall not exceed 30% |
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background flourecenet checkshall be performed when?
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Prior to each day and after every 8 hours of continous use.
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arosal cans should be checked for?
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performance and residual magnetism propr to each use and demaged if necessary
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Mobility checks are performed.
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On dry powder materials at least once a day prior to use.
Or every seven days. |
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System effectiveness check is done?
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At least every seven days with ketos tool stell ring inspection
It is used to verify aperage. |
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For system effectivness you can see how many indications on AC and DC
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AC-1000 1 line
DC- 1400 3 holes, 2500-5 holes, and 3400-6 holes. |