Materials (metals)

Question 1

What are the Key Differences between Hot Rolled and Cold Rolled steel?

Answer 1

Hot Rolled is:
Scaly
Blue-Gray Finish
Rough to the touch
Rounder edges (out of bound)

Cold Rolled is:
Glossy
Gray Finish
Smooth to the touch
Sharp Corners

Question 2

What are the 6 basic types of metal removal?

Answer 2

(1) Turning
(2) Hole Machining
(3) Milling
(4) Sawing
(5) Planing, Shaping, Broaching
(6) Abrasive Processes

Question 3

What Machine process defines the following?
Drilling, boring, reaming and tapping.

Answer 3

Hole Machining

Question 4

What are some types of abrasive machining processes? (3)

Answer 4

Grinding, lapping and honing

Question 5

Steel with .35% Carbon or greater is…

Answer 5

Medium to High Carbon Steel (Heat treatable)

Question 6

True or False

Pure aluminum is stronger than alloy aluminum

Answer 6

False. Alloys are stronger.

Question 7

Two most common Copper Alloys

Answer 7

Brass and Bronze

Question 8

What is Brass made up of?

Answer 8

Copper (60%) and Zinc (40%)

Question 9

What is Bronze made up of?

Answer 9

Copper (80%), Tin (20%)

Question 10

High Chromium (12%+) and Nickel, are included in what common alloy?

Answer 10

What is: Stainless Steel

Question 11

Why are Stainless Steels used?

Answer 11

Stain-less!
Oxidation produces chromium oxide rather than ferric oxide (classic brown rust)

Question 12

What are two common misconceptions for classifications of aluminum?

Answer 12

“Billet” aluminum and “aircraft” aluminum

Billet means “bar of metal”

“Aircraft aluminum” is meaningless and many alloys can be used in aircraft.