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3rd Year > Computerized cutting > Flashcards

Computerized cutting Flashcards

1
Q

What type of metals can be cut by plasma arc

A

Almost All types

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2
Q

Describe plasma cutting process

A

A process that uses high velocity jet ionized gas delivered from Constricting Orfice

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3
Q

What are some safety practises when operating plasma

A

Long sleeves gloves high protection dark goggles or welding shield

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4
Q

What happens if the nozzle is not in place for a safety safety feature

A

If it’s not in place in arc will not start

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5
Q

What are components of plasma

A

The shield ,retaining cap ,nozzle ,electrode and swirl ring

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6
Q

What are consumable parts on Plasma machine

A

Electrode and nozzle

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7
Q

If you cut thick metal what type of machine should you get

A

Higher amp machine

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8
Q

What is kerf

A

Avoid created by plasma cutting or the metal that was removed

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9
Q

What should the opening of the bottom die be on stainless steel fabrication

A

At least eight times material thickness

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10
Q

Martenstic and ferriitic metals are high weldables

A

No. They are low

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11
Q

What joint is not recommended for use of stainless steel

A

Lap joint

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12
Q

What type of tungsten should be used for stainless steel

A

1/16 of an inch or 2% pure

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13
Q

Should the filler rod matcher base metal

A

Yes

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14
Q

Does Stan still have low thermal conductivity 

A

Yes

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15
Q

What is a reasonable tip size for a spot welds

A

Eighths of an inch +2 metal thicknesses

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16
Q

What angle should you hold your angle grinder

A

10°

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17
Q

What happens when chromium Contant exceeds 11%

A

Invisible film is form to protect material

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18
Q

Can stainless steel rust

A

Yes one film is contaminated by iron

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19
Q

How many groups and series are there for stainless steel

A

Four groups too serious

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20
Q

What is the film form on stainless steel

A

Chromium oxide

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21
Q

Three ways stainless steel could be contaminated

A

Using mild steel drive chuck
Using a abrasives with mild steel
Dirty bench


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22
Q

What are two ways to compensate for spring back

A

Overbending
Breaking and coining

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23
Q

Advantage of air bending

A

Greater variety less tonnage less damage

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24
Q

What What amperage is required for Tig welding 16 gauge stainless steel

A

80-100

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25
Q

It is preheating and post heating required when welding most austentic stainless steel

A

No

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26
Q

Stainless steel has ……%Greater Co-efficiency thermal expansion and ….. Thermal conductivity

A

50
1/3

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27
Q

Three methods controlling distortion when welding stainless steel

A

Copper chill plates
skip welding
step back welding

28
Q

What are some considerations spot welding stainless

A

Increase electrode pressure decrease amperage and wild time

29
Q

Define finishing in regards to stainless steel

A

To give desired surface effect

30
Q

Procedure required to finish welds on stainless steel to mirror finish

A

Grind
sand
polish
buff

31
Q

What is the lightest shade for welding lens recommended for gas tungsten arc welding

A

10

32
Q

What is three dangers welding gloves protect us from

A

UV rays
heat
electric shock

33
Q

Why is it not recommended to run gas cylinders 0 psi

A

It prevents atmosphere contamination

34
Q

Is GTAW a good choice when welding outdoors

A

No shielding gas will displace

35
Q

What is the purpose of high frequency current for DC

A

Arc starting

36
Q

What is the purpose for high frequency current for AC welding

A

Arc starting
arc stability
gas ionization

37
Q

Five components of an air cooled torch

A

Torch body
Calletbody
Gas lens
Nozzle
Cap
Electrode

38
Q

What is the opening diameter of a number six gas nozzle

A

3:8

39
Q

Define laminar

A

Arranged in thin layers

40
Q

What is the purpose of Shielding gas

A

Exclude the atmospheric from the weld

41
Q

Is it more accurate to measure gas flow by volume or pressure

A

Pressure

42
Q

How many numbers to Determining filler rod

A

Two numbers mild steel three numbers stainless steel four numbers aluminum

43
Q

Why is aluminum best Welded on AC current

A

It provides cleaning Action

44
Q

What would cause a weld to have a lack of fusion

A

Arc length too long
current setting to low
bad prep

45
Q

Types of tungsten used for welding aluminum

A

Pure tungsten
2% Cerium 
2% thorium

46
Q

Fillet weld

A

Inside corner weld

47
Q

What is the effect of a finer point on a tungsten when Tig welding stainless

A

Deeper penetration

48
Q

Two ways to cut aluminum

A

By hand or Beverly shear

49
Q

When brake forming heavy gauge aluminum what works best

A

Press brake

50
Q

What temperature does oxide layer for Aluminum melt

A

3200 melts at 1200

51
Q

Aluminum Electroid uses bald end true or false

A

True

52
Q

How does flow metre read

A

Cubic ft.³/hour or litres per minute

53
Q

What should the inside diameter of the gas cap be

A

Three times the tungsten diameter

54
Q

With a single spot weld. If metal is twisted at what angle will it break

A

60-90

55
Q

Three disadvantages of GTAW

A

Slow speed , can’t weld outdoors , tungsten might break in weld

56
Q

Which material distorts the most when welded

A

Stainless steel by 50%

57
Q

What’s the gas flow range for stainless steel

A

10-30 cfh

58
Q

Stainless steel oxidation is known as

A

Sugaring , chromium oxide

59
Q

What metal is a greater conductor ? Aluminum or stainless

A

Aluminum

60
Q

If the gas in the cup is not giving complete coverage while welding , what must be done

A

Use a larger size

61
Q

CnC safety features

A

Nozzle in place
Pre flow sequence

62
Q

Plasma cutting is done with what three gases

A

Argon
Nitrogen
Oxygen

63
Q

Good bevel cut on cnc

A

1-3 is good
3-8 is bad

64
Q

What safety feature is there so you don’t get 300 v of dC current

A

Nozzle in place

65
Q

Duty cycle is done how many minutes

A

10 min

66
Q

Slow cutting leaves vertical lag lines

A

True

67
Q

Dross should be removed by

A

Grinding

3rd Year (12 decks)

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