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Flashcards in METALS Deck (23):
0

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

1

What kind of metal is usually extruded? What is the opposite of extrusion?

Aluminum... Drawing

2

What is brake forming?

Picking plates and sheets of metal, making one directional bends successively to fabricate the shape

3

What is annealing?

Reheating metal and slowly cooling to get a more ductile metal... Improves machinability and cold – forming characteristics

4

What is quenching?

Heating steel to a certain temperature and then rapidly cooling it by complete submersion… It's strengthens the steel

5

What is tempering?

Similar to quenching, but cools less rapidly

6

What is case hardening?

Putting a hard – surface steel over a relatively softer core

7

What is brazing?

Connecting two metals with a nonferrous filler material with a melting point lower than welding

8

What is galvanic action?

Corrosion when dissimilar metals contact each other

9

What are the three metals most susceptible to galvanic action?

1. Zinc
2. galvanize steel
3. aluminum
4. Steel
5. S.S.
6. Lead
7. Tin
8. Copper alloys
9. Alloy

Zebras gather all sane, silent leaderless tinkerers in close cooperation

9

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

10

What is grey cast iron?

With high silicon content ... Used for pipes, valves, hardware

11

What is ductility?

Being able to withstand a lot of deformation without failing

12

What is anodizing? Downside…?

Chemical process, integral coating on the metal. The downside is easily scratched.

13

Bronze is an alloy of…

Copper and tin

14

Brass is an alloy of…

Copper and zinc

15

What is Monel metal?

Combination of copper and nickel, highly resistant to corrosion, A trade name, used in roofing

16

What is zinc usually used for?

As a coating for steel to produce galvanized steel

17

What is terneplate?

An alloy of 75% lead and 25% tin used to plate steel for roofing

18

What is the code for a channel cut from a wide flange beam versus an American standard I-beam?

WT vs ST

19

Three advantages of open – web steel joists

Light weight and deficient, easy and fast to erect, open webbing allows ductwork and piping

20

Three degrees for spiral stairs, and which is the most common?

22.5°, 27°, and 30°, which is the most common

21

Aluminum versus brass: which one has rounded and which hard corners?

Aluminum has rounded corners, brass has hard corners