Materials & Processes Flashcards
- List the steps in a dye penetrant inspection?
- Thoroughly clean the materials surface
- Apply the penetrant for the specified dwell time
- Remove the penetrant with water or emulsifying cleaner
- Dry the part
- Apply the developer
- Inspect the results
- Describe the procedure for performing a magnetic particle inspection.
- Clean the ferrous material thoroughly
- Magnetize the part & apply ferromagnetic particles, either held in liquid suspension or dry powder
- If a discontinuity is present the magnetized particles will form a pattern in the shape of the discontinuity
- What are two types of self locking nuts?
All metal and fiber lock or elastic stop nuts
- What is the general rule for using self locking nuts?
Do not use at joints subject to rotation
- What type of cable is used in primary control systems?
Extra flexible 7x19 cable
- How can the correct “grip length” of a bolt be determined?
Equals the total thickness of the material being joined
- The length of AN standard bolts are measured in what fraction?
8ths of an inch
- What does the triangle mean on the head of a steel bolt?
Close tolerance bolt
- What numbers are used for close tolerance bolts?
AN-173 through AN-186 for hex bolts
NAS-80 through NAS-86 for countersunk
- What is the difference between a standard bolt and close tolerance bolt?
Close tolerance bolt is machined more precise and used in high performance applications
- A solid rivet diameter is always measured in what fraction?
32nds of an inch
- What is the purpose of a channel nut and nut plate?
Both nuts allow a screw or bolt to be installed without holding the nut
- What are common materials for cotter pins to be made from?
Low carbon steel & stainless steel
- What is the smallest cable that can be used in primary control systems?
1/8 inch diameter
- What should be the depth of penetration when making a fillet weld?
Penetration should be 25-50% of thickness of base metal
- What precision measuring instruments are used to measure outside dimensions?
Outside micrometer & vernier calipers
- What term describes a metal that is based on iron?
Ferrous alloy
- What system is used to identify AN type aircraft bolts?
Aircraft bolts have code markings on bolt heads for identification
- What is the difference between a close tolerance & regular AN bolt?
Close tolerance bolts are used in applications where a bolted joint is subject to severe vibrations and load reversals.
- What are the steps for solution heat treating aluminum alloys?
- Heated
- Heat soaked
- Rapidly quenched to a low temperature
- In what state is aluminum alloy immediately after solution heat treating and quenching?
Alloy is in a soft state, so the material must be naturally aged, or precipitation hardened
- What is done to prevent certain aluminum alloy rivets (D and DD) from becoming hard after heat treating and quenching?
stored in a refrigerator at temperature lower than 32 degrees F.
- What do rivet head markings indicate?
Alloy of the rivet
- Why is alloy steel that is responsive to heat treatment usually less suitable for welding?
Becomes brittle & looses its ductility around the weld