Materials in process Flashcards
Describe the steps for a dye, penetrant inspection
The surface is cleaned. The penetrate is applied in allowed to dwell for specified time, the penetrant is removed with an emulsifier or cleaner, dye the part and apply the developer inspect defects
Name some tools that are commonly used to assist in making visual inspections of welds
Magnifying glass, flashlight mirror, and possibly a borescope
What are some of the nondestructive testing methods that may be used on aluminum components
Visual dye penetrant eddy, current ultrasonic, testing and radiography
Which nondestructive testing method can be performed without removing the surface coatings such as primer, paint, anodized films, and is effective in detecting surface and sub surface corrosion
Eddy current inspection method
What process occurs during the penetration stage of a dye penetrant inspection when the penetrating liquid is applied, and then removed from a cracked part
The pitcher enters the crack by capillary action, and remains there, until made visible by the developer
Name the different types of hardness tester, used on steel and other alloys such as aluminum
Rockwell, brinnell in Barcol
Which steel alloy is noted for its toughness, and is most commonly used for aircraft tubular structure, such as frame, members, engine, mounts, landing gear, parts, and other structural parts
Chromalloy , chrome-molybdenum steel
A correctly made, butt weld will have what bead with and how much penetration
The bead width should be 3 to 5 times the thickness of the base metal, and there must be 100% penetration
What are the characteristics of a cold weld
A cold world has rough, irregular edges that are not feathered into the base material and has variations in penetration amounts
The penetration of a fillet weld should be what percentage of the thickness of the base metal
25 to 50%
What is the term used that applies to the group of metals that has iron as its principle constituent
Ferrous
Describe the basic steps for conduction, a magnetic particle inspection
Magnetized the part, then coat the surface with ferromagnetic particles, if a defect, or discontinuity is present, the particles align with the discontinuity, forming a visible pattern
What is indicated by the markings on the heads of a solid shank rivet
The material that they are made of, and indirectly their strength
How can you keep heat treated aluminum alloy rivet soft enough to install after quenching process
If the rivets are stored in a freezer, they will remain soft for several days
What is the grip length of a bolt?
From the bottom of the boat head to where the threads start, the length of the unthreaded portion of the bolt
What does the grip length of a bolt correspond to?
The thickness of the material being fastened with the bolt
In what way are AN standard steel bolts identified
By the code markings on the bolt heads
What is the difference between a close tolerance, bolt, and a general purpose bolt?
Close tolerance bolts are machine to more accurate dimensions
When referring to a standard torque chart, how can a 1/4 x 28 size bolt be defined
It is a 1/4 inch diameter bolt with a thread count of 28 threads per inch
The diameter of AN standard steel bolt as in the part number AN3-5 is measured in what fractional increment
1/16th of an inch the AN3 is a 3/16” diameter bolt
What are the basic types of washers?
Plain,lock, special
What hardware is used as a threaded bushing to repair threads
Helicoil
For what types of applications are self locking nuts allowed
Self locking nuts may not be used when either the bolt or the nut is subject to rotation
If the maintenance procedures don’t specify a torque value for a bolt or nut how can you determine the proper values?
Consult a standard torque table, such as the one and AC43.13–1B
What type of precision measuring instrument can be used to measure the outside dimensions of aircraft parts
Outside micrometers in vernier calipers
For what reasons should a micrometer be periodically calibrated?
If dropped, its accuracy may be affected, or if the spindles is over tightened, the frame may be sprung or continually sliding objects between the anvil, and the spindle may wear surface 
How do you work hard in a piece of metal?
By cold, working the metal
Describe the difference between thermosetting and a thermal plastic resin
A thermosetting resin doesn’t soften when heated and chares, or burns rather than melting. Thermoplastic resins become soft and pliable when heated and hardened when cooled
Explain how thermoplastic and thermosetting resins are commonly used in modern aircraft
Plexiglass is a thermalplastic resin commonly used for windshield and windows, Thermosetting residents are most often used as the matrix material in composite structures
Name one of the types of resin commonly used as a matrix material for aircraft, composite laminate
Polyester, resin, or epoxy resin
What are some of the materials that are commonly used as the reinforcing component of a composite structure
Fiberglass, Kevlar, carbon fiber, Linen, paper
What are reasons that alloy steel that is responsive to heat? Treatment is usually less suitable for welding.
It may become brittle and lose its ductility in the area of the weld
Give one advantage of a pre-Preg (pre-impregnated) materials, other than saving time in the construction or repair of composite components
Pre-preg fabrics contain the correct amount of matrix.
What are advantages of using composites in aircraft?
High strength to weight ratio, longer life than metals, higher corrosion resistance, easy to repair
What is potting compound used for in bonded honeycomb repairs
Filling, small holes, 1 inch or less
