metals

Question 1

ducticity meaning

Answer 1

ability of a metal to be drawm into a wire

Question 2

malleability

Answer 2

ability to be reshaped without cracking

Question 3

hardness

Answer 3

ability to resist abrasive wear / indentation
- cant be scratched or cut

Question 4

toughness

Answer 4

ability to withstand impact - / absorb energy

Question 5

if a material is hard it is also……….

Answer 5

brittle and will snap easily

Question 6

if a material is tough it is also…….

Answer 6

soft - how it absorbs energy

Question 7

strength meaning

Answer 7

ability to withstand force without breaking / permanently deforming

Question 8

metals can be categorised as either

Answer 8

• ferrous
• non - ferrous

Question 9

ferrous meaning

Answer 9

has iron

Question 9

non-ferrous meaning

Answer 9

no iron

Question 10

what is ferrous also known as

Answer 10

iron and steel

Question 11

why is iron not very useful

Answer 11

it is soft and ductile

Question 12

what happens when you mix carbon and ferrous to make steel

Answer 12

properties improve

Question 13

what happens when there is more carbon

Answer 13

metal becomes hard and less tough

Question 14

what are the three welding methods

Answer 14

mig
tig
spot (resistance)

Question 15

what does mig mean

Answer 15

metal inert gas

Question 16

what is mig used for

Answer 16

weld fairly thin metals together and tubes and box sections

Question 17

what is used to generate an electric arc in mig

Answer 17

heat

Question 18

what can the inert gas be in mig

Answer 18

co2
argon

Question 19

what does the inert gas create in mig

Answer 19

a shield around the area being joined to prevent oxidation

Question 20

what is mig suitable for

Answer 20

one off production / higher volume production

Question 21

what is mig used to make

Answer 21

• bike frames
• playground equipment
• steel framed furniture
• vehicle exhausts

Question 22

what does tig mean

Answer 22

tungsten inert gas

Question 23

what is tip used for

Answer 23

stainless steel and non-ferrous metals

Question 24

what is an example of an non-ferrous metal

Answer 24

aluminium

Question 25

what does the tig allow

Answer 25

greater control and more accurate, stronger welds can be made

Question 26

what is the required skill level to use the tig

Answer 26

high level of skill and it is slow

Question 27

what is the tig used to make

Answer 27

- aluminium / titanium bike frames - stainless steel swimming pool ladders

Question 28

what is spot welding and resistance welding used for

Answer 28

thin metals

Question 29

how does spot welding and resistance welding work

Answer 29

2 copper electrodes are closed around the 2 sheets to be joined a large current is forced through creating resistance and heat joining the 2 parts together

Question 30

what is spot welding and resistance welding used for

Answer 30

- car industry - joining handles to saucepans

Question 31

CARRY ON WITH THE NUTS

Question 32

what type are screws are there

Answer 32

- self tapping screws - wood screws - machine screws

Question 33

what does self tapping screws do

Answer 33

cut their own thread

Question 34

what does self tapping screws require

Answer 34

a plain hole before use

Question 35

what is self tapping screws used for

Answer 35

metals and plastics

Question 36

what does self tapping screws usually have

Answer 36

coarse thread and a tapering diameter

Question 37

what is wood screws a form of

Answer 37

self-tapping screws

Question 38

what is required with a wood screw

Answer 38

pilot hole for the shank and possibly a countersink

Question 39

what are machine screws used for

Answer 39

metal objects or plastic

Question 40

what does machine screws rely on

Answer 40

-the hole they are being inserted having a threat cut internally - have an evenly pitched thread and a constant diameter - typically 2mm - 20mm

Question 41

what do bolts have

Answer 41

a plain shank between the head and the thread

Question 42

how do you use a bolt

Answer 42

a bolt is inserted into a hole that is slightly larger than itself and the screw threads are secured into a nut with a washer in between

Question 43

what is the shape of a nut

Answer 43

plain hexagonal, locking nut

Question 44

what does a wing nut do

Answer 44

allows the joint to be tightened without tools

Question 45

why are washers an esential part of a boted joint

Answer 45

- help to prevent damage to the components being joined - some prevent loosening of the connection

Question 46

what are the most essential washers

Answer 46

plain and spring washers

Question 47

what are riverts associated with

Answer 47

joining flat sheet metal components

Question 48

what are the drawbacks of riverts

Answer 48

both sides of the joint need to be accessed

Question 49

what do pop riverts consist of

Answer 49

consist of a hollow alluminium alloy rivert and steel pin

Question 50

what is a rivert gun used for

Answer 50

used to pull the steel pin through the rivet so that it clamps against the back of the components