Identification of aluminium alloy

Question 1

What are the 4 most common Aluminium alloys in the RNZAF

Answer 1

2024 Copper

5052 Magnesium

6061 Magnesium + silicon

7075 Zinc

Question 2

What are the 7 things that aluminium sheets can be identified by

Answer 2

4 digit designation

Temper state

Clad or Bare

Fed spec Number

Manufactures number

Batch number

Thickness “Thal”

Question 3

What is the “Thousands series”

Answer 3

1xxxPure aluminium

2xxx Copper

3xxx Manganese

4xxx Silicon

5xxx Magnesium

6xxx Magnesium + Silicon

7xxx Zinc

8xxx Others

Question 4

What are the two types of hardening

Answer 4

Cold working or heat treatment

Question 5

What are the hardness designators for cold working

H1,H2,H3

Answer 5

H1 Strain hardened
H2 Strain hardened + partially annealed
H3 Strain hardened + Stabilised

Question 6

What are the following temper states (heat treatment)

O,W,T3,T4,T6

Answer 6

O = Annealed

W = Solution Heat treated (20 mins) unstable

T3= Solution Heat treated + cold worked

T4=Solution Heat treated +naturally age hardened

T6=Solution Heat treated + Artificially age hardened

Question 7

How do you know what Sheet to use

Answer 7

Stated in drawing

Stated in SRM or repair scheme

What forming process it will be subject to

What it is used for