AQA DT: U5C - Metal Based Materials

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