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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
It is preheating and post heating required when welding most austentic stainless steel
No
26
Stainless steel has ……%Greater Co-efficiency thermal expansion and ….. Thermal conductivity
50 1/3
27
Three methods controlling distortion when welding stainless steel
Copper chill plates skip welding step back welding
28
What are some considerations spot welding stainless
Increase electrode pressure decrease amperage and wild time
29
Define finishing in regards to stainless steel
To give desired surface effect
30
Procedure required to finish welds on stainless steel to mirror finish
Grind sand polish buff
31
What is the lightest shade for welding lens recommended for gas tungsten arc welding
10
32
What is three dangers welding gloves protect us from
UV rays heat electric shock
33
Why is it not recommended to run gas cylinders 0 psi
It prevents atmosphere contamination
34
Is GTAW a good choice when welding outdoors
No shielding gas will displace
35
What is the purpose of high frequency current for DC
Arc starting
36
What is the purpose for high frequency current for AC welding
Arc starting arc stability gas ionization
37
Five components of an air cooled torch
Torch body Calletbody Gas lens Nozzle Cap Electrode
38
What is the opening diameter of a number six gas nozzle
3:8
39
Define laminar
Arranged in thin layers
40
What is the purpose of Shielding gas
Exclude the atmospheric from the weld
41
Is it more accurate to measure gas flow by volume or pressure
Pressure
42
How many numbers to Determining filler rod
Two numbers mild steel three numbers stainless steel four numbers aluminum
43
Why is aluminum best Welded on AC current
It provides cleaning Action
44
What would cause a weld to have a lack of fusion
Arc length too long current setting to low bad prep
45
Types of tungsten used for welding aluminum
Pure tungsten 2% Cerium  2% thorium
46
Fillet weld
Inside corner weld
47
What is the effect of a finer point on a tungsten when Tig welding stainless
Deeper penetration
48
Two ways to cut aluminum
By hand or Beverly shear
49
When brake forming heavy gauge aluminum what works best
Press brake
50
What temperature does oxide layer for Aluminum melt
3200 melts at 1200
51
Aluminum Electroid uses bald end true or false
True
52
How does flow metre read
Cubic ft.³/hour or litres per minute
53
What should the inside diameter of the gas cap be
Three times the tungsten diameter
54
With a single spot weld. If metal is twisted at what angle will it break
60-90
55
Three disadvantages of GTAW
Slow speed , can’t weld outdoors , tungsten might break in weld
56
Which material distorts the most when welded
Stainless steel by 50%
57
What’s the gas flow range for stainless steel
10-30 cfh
58
Stainless steel oxidation is known as
Sugaring , chromium oxide
59
What metal is a greater conductor ? Aluminum or stainless
Aluminum
60
If the gas in the cup is not giving complete coverage while welding , what must be done
Use a larger size
61
CnC safety features
Nozzle in place Pre flow sequence
62
Plasma cutting is done with what three gases
Argon Nitrogen Oxygen
63
Good bevel cut on cnc
1-3 is good 3-8 is bad
64
What safety feature is there so you don’t get 300 v of dC current
Nozzle in place
65
Duty cycle is done how many minutes
10 min
66
Slow cutting leaves vertical lag lines
True
67
Dross should be removed by
Grinding

3rd Year (12 decks)

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