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junk (pd) > metals > Flashcards

metals Flashcards

1
Q

ducticity meaning

A

ability of a metal to be drawm into a wire

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2
Q

malleability

A

ability to be reshaped without cracking

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3
Q

hardness

A

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

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4
Q

toughness

A

ability to withstand impact - / absorb energy

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5
Q

if a material is hard it is also……….

A

brittle and will snap easily

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6
Q

if a material is tough it is also…….

A

soft - how it absorbs energy

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7
Q

strength meaning

A

ability to withstand force without breaking / permanently deforming

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8
Q

metals can be categorised as either

A
  • ferrous
  • non - ferrous
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9
Q

ferrous meaning

A

has iron

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9
Q

non-ferrous meaning

A

no iron

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10
Q

what is ferrous also known as

A

iron and steel

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11
Q

why is iron not very useful

A

it is soft and ductile

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12
Q

what happens when you mix carbon and ferrous to make steel

A

properties improve

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13
Q

what happens when there is more carbon

A

metal becomes hard and less tough

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14
Q

what are the three welding methods

A

mig
tig
spot (resistance)

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15
Q

what does mig mean

A

metal inert gas

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16
Q

what is mig used for

A

weld fairly thin metals together and tubes and box sections

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17
Q

what is used to generate an electric arc in mig

A

heat

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18
Q

what can the inert gas be in mig

A

co2
argon

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19
Q

what does the inert gas create in mig

A

a shield around the area being joined to prevent oxidation

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20
Q

what is mig suitable for

A

one off production / higher volume production

21
Q

what is mig used to make

A
  • bike frames
  • playground equipment
  • steel framed furniture
  • vehicle exhausts
22
Q

what does tig mean

A

tungsten inert gas

23
Q

what is tip used for

A

stainless steel and non-ferrous metals

24
Q

what is an example of an non-ferrous metal

A

aluminium

25
Q

what does the tig allow

A

greater control and more accurate, stronger welds can be made

26
Q

what is the required skill level to use the tig

A

high level of skill and it is slow

27
Q

what is the tig used to make

A
  • aluminium / titanium bike frames
  • stainless steel swimming pool ladders
28
Q

what is spot welding and resistance welding used for

A

thin metals

29
Q

how does spot welding and resistance welding work

A

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

30
Q

what is spot welding and resistance welding used for

A
  • car industry
  • joining handles to saucepans
31
Q

CARRY ON WITH THE NUTS

A
32
Q

what type are screws are there

A
  • self tapping screws
  • wood screws
  • machine screws
33
Q

what does self tapping screws do

A

cut their own thread

34
Q

what does self tapping screws require

A

a plain hole before use

35
Q

what is self tapping screws used for

A

metals and plastics

36
Q

what does self tapping screws usually have

A

coarse thread and a tapering diameter

37
Q

what is wood screws a form of

A

self-tapping screws

38
Q

what is required with a wood screw

A

pilot hole for the shank and possibly a countersink

39
Q

what are machine screws used for

A

metal objects or plastic

40
Q

what does machine screws rely on

A

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

41
Q

what do bolts have

A

a plain shank between the head and the thread

42
Q

how do you use a bolt

A

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

43
Q

what is the shape of a nut

A

plain hexagonal, locking nut

44
Q

what does a wing nut do

A

allows the joint to be tightened without tools

45
Q

why are washers an esential part of a boted joint

A
  • help to prevent damage to the components being joined
  • some prevent loosening of the connection
46
Q

what are the most essential washers

A

plain and spring washers

47
Q

what are riverts associated with

A

joining flat sheet metal components

48
Q

what are the drawbacks of riverts

A

both sides of the joint need to be accessed

49
Q

what do pop riverts consist of

A

consist of a hollow alluminium alloy rivert and steel pin

50
Q

what is a rivert gun used for

A

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

junk (pd) (5 decks)

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