Studied by 2 people
Metal based materials - Working with metal based materials and fixings - Commercial manufacturing, treatments and finishes
What do the benefits of mining include?
money, jobs and industry
A metal alloy is…
a mixture of 2 or more elements
What process does impure metal need to undergo?
refinement
What process chemically alters raw material?
smelting
What does refinement do to a metal?
It purifies it
What waste material is tapped off during smelting?
slag
What temperature does iron melt at? (.C)
1538
What is the iron referred to as when it sinks to the bottom of the blast furnace during smelting?
pig iron
Pig iron has a very high ____________ content.
carbon
If a material has a high carbon content, it becomes ___________ .
brittle
What is the primary source of aluminium?
Bauxite
What process must bauxite undergo before it can become aluminium?
chemical refinement
Bauxite is then smelted using _________________ to produce pure aluminium.
electrolysis
What is duralumin?
A hard alloy of aluminium.
What is duralumin used in?
aircraft, lightweight car body panels, wheels and engine pistons
Metal is a __________ resource.
finite
How long does it take aluminium to decompose?
200-500 years
Metal can _________ and ______________ .
rust and oxidize
In what industries is metal widely used in?
Manufacture and construction
List the 5 stock forms.
tube, box, sheet, strip and rod
What are stock forms sold by?
length, width, thickness, gauge and pitch
What are the 3 main elements of standardization?
profile, threaded rod and sheet
What is pipe wall thickness measured in?
mm or gauge
In pipe wall thickness, what does a high gauge mean?
low wall thickness
Pitch refers to the……
coarseness of a thread
Standard nuts and threaded rods are available in various…….
diameters and pitches
List the 4 main metal fixings.
machine screws, nuts, bolts and washers
Metal fixings are available in different _____________ methods.
driving
Pop-rivets are used to create a ____________________________ fixing.
semi-permanent
Pop riveting only requires access to 1 or 2 sides of the material?
1
Cold-formed rivets require access to _____________ of the material.
both sides
Drill bits are usually made out of……
high speed steel
Note
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