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Cutting And Gouging Processes > Plasma Arc Cutting > Flashcards

Plasma Arc Cutting Flashcards

1
Q

What is the minimum recommended lens shade for plasma cutting?

A

5

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2
Q

Why is a full helmet or cutting shield recommended for plasma cutting?

A

Protect from Ultraviolet light

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3
Q

What is the appropriate hearing protection for PAC?

A

Earplugs

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4
Q

Other workers should be protected from the ultraviolet light of plasma cutting if they are within how many meters?

A

10m (33ft)

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5
Q

True or false? Respiratory equipment should be worn when PAC, because the plasma arc is hot enough to vaporize the base metal.

A

True

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6
Q

What is the open circuit voltage range of PAC?

A

100-400 V

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7
Q

When unattended, What should be done to machines?

A

They should be turned off

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8
Q

What should be designated if there is a risk of a fire?

A

Fire watch

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9
Q

What is the biggest benefit of PAC?

A

It can be done on any metal that conducts electricity

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10
Q

What is plasma?

A

Ionized gas

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11
Q

The arc is started between the copper nozzle and what electrode?

A

Hafnium

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12
Q

The plasma jet can reach temperatures of?

A

30,000°C (54,032°F)

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13
Q

What is the most common gas used in PAC?

A

Compressed air

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14
Q

Hi current cutting requires what type of cool torches?

A

Water

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15
Q

True or false? Plasma cuts have a straight side and a slightly bevelled side

A

True

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16
Q

What process is best suited for gouging aluminum?

A

Plasma arc gouging PAG 

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17
Q

True or false? PAC can stack cut better than OFC (Oxyfuel gas cutting)

A

True

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18
Q

What are the benefits of PAC on sheet metal?

A

No distortion, fast, and clean

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19
Q

Compressed air used in PAC must be?

A

Dry/filtered

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20
Q

Portable PAC units usually run on How many gases?

A

One

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21
Q

PAC power sources are what current?

A

DCEN (direct current electrode negative)

22
Q

What is the voltage operating range?

A

30-60 V

23
Q

PAC power sources come in amperage ranges from 12 Amps too?

A

1000 amps

24
Q

Pilot arcs will usually shut off after how many seconds?

A

2 seconds

25
Q

True or false? PAC control units will not allow the torch to fire if its senses an issue

A

Sure

26
Q

What safety feature does a manual plasma torch have?

A

Interlocked on/off trigger

27
Q

How are plasma torches rated?

A

Max Pierce thickness

28
Q

What affects electrode life in PAC?

A

Dryness/cleanliness of Air Supply, number of cuts, and pilot arc on time

29
Q

When should an electrode be replaced?

A

0.8 mm (1/32in) deep pit

30
Q

What directs the plasma?

A

Nozzle

31
Q

What is standoff?

A

Tip to work distance

32
Q

True or false? Only heavy duty PAC torches require cooling

A

False

33
Q

At what amperage are PAC torches usually water cooled?

A

100 amps

34
Q

Which type of torch is more accurate?
1. Air cooled
2. air injected
3. water cooled
4. water injected

A
  1. water injected
35
Q

What can be used to reduce spatter buildup?

A

Anti-spatter spray

36
Q

How can you repair cables with breaks in the insulation and exposed wires?

A

Replace with new cables

37
Q

What is the other name for the ground cable?

A

Work peace lead

38
Q

True or false? Plasma gas and secondary gases must match

A

False

39
Q

What is the best gas for cutting stainless steel?

A

Nitrogen

40
Q

What item is considered a consumable?
1. Air fittings
2. Cables and connecters
3. Electrode
4. PAC torch

A
  1. Electrode
41
Q

What range can plasma tables size from in either direction?

A

2-100 ft

42
Q

True or false? most plasma tables can accept CAD files

(Computer aided design (CAD) contains both 2-D and 3-D designs)

A

True

43
Q

How do you reduce fumes, ultraviolet light, and noise on a plasma table?

A

By cutting on a water table

44
Q

Aluminum should not be cut underwater with PAC because it could?

A

Explode

45
Q

PAC current required and cutting speed depend on?

A

Material type and thickness

46
Q

True or false? Excessive amperage is better than two little when PAC.

A

True

47
Q

The three most cut medals with PAC are?

A

Low carbon steel, aluminum, and stainless steel

48
Q

How can you tell if there is moisture in compressed air used in PAC?

A

Blow compressed air onto a lens or piece of glass and look for moisture

49
Q

What is the most important factor to improve cut quality?

A

Travel speed

50
Q

When cutting carbon steel at the correct travel speed what should the angle of the draglines be?

A

10 -15°

51
Q

What happens when the nozzle touches the base metal?

A

Double arcing

Cutting And Gouging Processes (2 decks)

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