Chapter 2) Hand And Commercial Processing

Question 1

Name 2 temporary joining methods

Answer 1

1) nut and Bolt

2) self tapping screw

Question 2

Name 3 processes of joining metals

Answer 2

1) crimping
2) soldering
3) brazing

Question 3

Stage the processes of soldering

Answer 3

1) metal is cleaned using flux
2) metal must have small gap
3) metal is heated
4) filler rod is run down the gap
5) left to cool

Question 4

Name three forms of corrosion and what they are

Answer 4

Rust-happens to ferrous metals, caused by no studs entering the metal
Dry rot- a fungus which turns the fibres to dust caused in damp moist conditions
Wet rot- caused by dry and wet conditions in wood can result in warping

Question 5

What type of plastic is less stable when exposed to the outdoor

Answer 5

Polythene

Question 6

What is the name of the sealant used in the tyre industry to act as a screen against uv light?

Answer 6

Carbon Black

Question 7

What is deburring?

Answer 7

Removing sharp excess once metal has been cut- can cut any wires for example

Question 8

What is the process known as to add another layer of metal to coat metal
Explain how this is done

Answer 8

Electroplating

An anode( material to coat) is placed in a bath with the cathode(the product) as a voltage is applied this transfers particles into the metal coating it in a fine layer as a finish

Question 9

How is electrostatic spray painting done?

Answer 9

The paint is positively charged and the object is negatively charged
This makes the paint magnetise to the object

Question 10

What is pressure finished wood known as, describe the process as well as the process name

Answer 10

Tanalising

Wood is impregnated with copper sulphate as well as other salts that help prevent water from being absorbed

Question 11

Malleability-ability to withstand deformation
Ductility-ability of a material to be drawn out
Elasticity -ability of a material to be bent and flexed
Toughness -ability to with stand a sudden impact without fraction

Answer 11

Hardness -ability to withstand resist abrasive wear
Durability -ability to withstand wear and tear
Stability -resist change the size and shape due to the environment
Strength -ability to withstand force without breaking

Question 12

What is an example of a hardness Test

Answer 12

Using the Brinell method a punch is applied to the surface of a material - the larger the surface area the less hard the material is

Question 13

What is an example of Ductility testing?

Answer 13

Bending a material 90/degrees if it shows signs of cracking it is not very ductile

Question 14

Clamping metal and measuring the energy needed to break the material is an example of…?

Answer 14

Tensile testing