METALS Flashcards
What kind of metal is usually extruded? What is the opposite of extrusion?
Aluminum… Drawing
What is one advantage of hot rolling and one advantage of cold rolling? Large structural steel is usually…
Hot rolling eliminates flaws in the metal, cold rolling increases the strength and elastic limit of metal (but decreases ductility)
… Hot rolled
What is brake forming?
Picking plates and sheets of metal, making one directional bends successively to fabricate the shape
What is annealing?
Reheating metal and slowly cooling to get a more ductile metal… Improves machinability and cold – forming characteristics
What is quenching?
Heating steel to a certain temperature and then rapidly cooling it by complete submersion… It’s strengthens the steel
What is tempering?
Similar to quenching, but cools less rapidly
What is case hardening?
Putting a hard – surface steel over a relatively softer core
What is brazing?
Connecting two metals with a nonferrous filler material with a melting point lower than welding
What is galvanic action?
Corrosion when dissimilar metals contact each other
What are the three metals most susceptible to galvanic action?
- Zinc
- galvanize steel
- aluminum
- Steel
- S.S.
- Lead
- Tin
- Copper alloys
- Alloy
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What is the difference between wrought iron and cast iron?
Wrought iron has a low carbon content and cast-iron has a high carbon content
What is grey cast iron?
With high silicon content … Used for pipes, valves, hardware
What is ductility?
Being able to withstand a lot of deformation without failing
What is anodizing? Downside…?
Chemical process, integral coating on the metal. The downside is easily scratched.
Bronze is an alloy of…
Copper and tin
Brass is an alloy of…
Copper and zinc
What is Monel metal?
Combination of copper and nickel, highly resistant to corrosion, A trade name, used in roofing
What is zinc usually used for?
As a coating for steel to produce galvanized steel
What is terneplate?
An alloy of 75% lead and 25% tin used to plate steel for roofing
What is the code for a channel cut from a wide flange beam versus an American standard I-beam?
WT vs ST
Three advantages of open – web steel joists
Light weight and deficient, easy and fast to erect, open webbing allows ductwork and piping
Three degrees for spiral stairs, and which is the most common?
22.5°, 27°, and 30°, which is the most common
Aluminum versus brass: which one has rounded and which hard corners?
Aluminum has rounded corners, brass has hard corners
