Materials and Process Flashcards
Liquid penetrant inspection methods may be used on which of the following?
1. porous plastics.
2. ferrous metals.
3. nonferrous metals.
4. smooth primeer-sealed wood.
5. nonporous plastics.
2,3,5
Which of the following defects are not acceptable for metal lines?
1. Cracked flare
2. Seams
3. Dents in the heel of a bend less than 20% of the diameter
4. Scratches/nicks on the inside of a bend less than 10% of wall thickness
5. Dents in straight section that are 20% of tube diameter
1,2,3, and 5
How many of these factors are considered essential knowledge for x-ray exposure?
1. Processing of the film.
2. Material thickness and density.
3. Exposure distance and angle.
4. Film characteristics.
3
The testing medium that is generally used in magnetic particle inspection utilizes a ferromagnetic
material that has
High permeability low retentivity
Which statement relating to the residual magnetizing inspection method is true?
It maybe used with steels which have been heat treated for stressed application
A mechanic has completed a bonded honeycomb repair using the potted compound repair technique.
What nondestructive testing method is used to determine the soundness of the repair after the repair
has cured?
Metallic ring test
What two types of indicating mediums are available for magnetic particle inspection?
Wet and dry process materials
Which of the following materials may be inspected using the magnetic particle inspection method?
1. Magnesium alloys.
2. Aluminum alloys.
3. Iron alloys.
4. Copper alloys.
5. Zinc alloys.
3
One way a part may be demagnetized after magnetic particle inspection is by
Slowly moving out of an ac magnetic field of sufficient strength
Which type crack can be detected by magnetic particle inspection using either circular or longitudinal
magnetization?
45 degrees
Which of the following methods may be suitable to use to detect cracks open to the surface in
aluminum forgings and castings?
1. Dye penetrant inspection.
2. Magnetic particle inspection.
3. Metallic ring (coin tap) inspection.
4. Eddy current inspection.
5. Ultrasonic inspection.
6. Visual inspection.
1,4,5,6
To detect a minute crack using dye penetrant inspection usually requires
A longer than normal penetrating time
Which of the following is a main determinant of the dwell time to use when conducting a dye or
fluorescent penetrant inspection?
The size and shape of the discontinuities being look for
When checking an item with the magnetic particle inspection method, circular and longitudinal
magnetization should be used to
Reveal all possible defects
In magnetic particle inspection, a flaw that is perpendicular to the magnetic field flux lines generally
causes
A large disruption in the magnetic field
If dye penetrant inspection indications are not sharp and clear, the most probable cause is that the part
Was not thoroughly washed before the developer was applied
(1) An aircraft part may be demagnetized by subjecting it to a magnetizing force from alternating current
that is gradually reduced in strength.
(2) An aircraft part may be demagnetized by subjecting it to a magnetizing force from direct current that
is alternately reversed in direction and gradually reduced in strength.
Regarding the above statements,
Both no. 1 and 2 are true
The pattern for an inclusion is a magnetic particle buildup forming
Parallel lines
A part which is being prepared for dye penetrant inspection should be cleaned with
Water base solvents only
Under magnetic particle inspection, a part will be identified as having a fatigue crack under which
condition?
The discontinuity is found in a nonstressed area of the part
In performing a dye penetrant inspection, the developer
Acts as a blotter to produce a visible indication
What defects will be detected by magnetizing a part using continuous longitudinal magnetization with a
cable?
Defects perpendicular to the long axis of the part
Circular magnetization of a part can be used to detect which defects?
Defects parallel to the long axis of the part
Defects perpendicular to the long axis of the part
Both no. 1 and 2 are true
What type of corrosion may attack the grain boundaries of aluminum alloys when the heat treatment
process has been improperly accomplished?
Intergranular
Which of the following describe the effects of annealing steel and aluminum alloys?
1. decrease in internal stress.
2. softening of the metal.
3. improved corrosion resistance.
1 , 2
Which heat-treating process of metal produces a hard, wear-resistant surface over a strong, tough core?
Case hardening
Which heat-treating operation would be performed when the surface of the metal is changed chemically
by introducing a high carbide or nitride content?
Case hardening
Normalizing is a process of heat treating
Iron base metals only
Which of the following occurs when a mechanical force is repeatedly applied to most metals at room
temperature, such as rolling, hammering, or bending?
1. The metals become artifically aged.
2. The metals become stress corrosion cracked.
3. The metals become cold worked, strain or work hardened.
3
The reheating of a heat treated metal, such as with a welding torch
Can significally alter a metals properties in the reheated area
Why is steel tempered after being hardened?
To relieve its internal stresses and reduce its brittleness
What aluminum alloy designations indicate that the metal has received no hardening or tempering
treatment?
3003-F
Which material cannot be heat treated repeatedly without harmful effects?
Clad aluminum alloys
What is descriptive of the annealing process of steel during and after it has been annealed?
Slow cooling; low strength
Unless otherwise specified, torque values for tightening aircraft nuts and bolts relate to
Clean dry threads
What is generally used in the construction of aircraft engine firewalls?
Stainless steel