Plasma Arc Cutting Flashcards
What is the minimum recommended lens shade for plasma cutting?
5
Why is a full helmet or cutting shield recommended for plasma cutting?
Protect from Ultraviolet light
What is the appropriate hearing protection for PAC?
Earplugs
Other workers should be protected from the ultraviolet light of plasma cutting if they are within how many meters?
10m (33ft)
True or false? Respiratory equipment should be worn when PAC, because the plasma arc is hot enough to vaporize the base metal.
True
What is the open circuit voltage range of PAC?
100-400 V
When unattended, What should be done to machines?
They should be turned off
What should be designated if there is a risk of a fire?
Fire watch
What is the biggest benefit of PAC?
It can be done on any metal that conducts electricity
What is plasma?
Ionized gas
The arc is started between the copper nozzle and what electrode?
Hafnium
The plasma jet can reach temperatures of?
30,000°C (54,032°F)
What is the most common gas used in PAC?
Compressed air
Hi current cutting requires what type of cool torches?
Water
True or false? Plasma cuts have a straight side and a slightly bevelled side
True
What process is best suited for gouging aluminum?
Plasma arc gouging PAG 
True or false? PAC can stack cut better than OFC (Oxyfuel gas cutting)
True
What are the benefits of PAC on sheet metal?
No distortion, fast, and clean
Compressed air used in PAC must be?
Dry/filtered
Portable PAC units usually run on How many gases?
One
PAC power sources are what current?
DCEN (direct current electrode negative)
What is the voltage operating range?
30-60 V
PAC power sources come in amperage ranges from 12 Amps too?
1000 amps
Pilot arcs will usually shut off after how many seconds?
2 seconds
True or false? PAC control units will not allow the torch to fire if its senses an issue
Sure
What safety feature does a manual plasma torch have?
Interlocked on/off trigger
How are plasma torches rated?
Max Pierce thickness
What affects electrode life in PAC?
Dryness/cleanliness of Air Supply, number of cuts, and pilot arc on time
When should an electrode be replaced?
0.8 mm (1/32in) deep pit
What directs the plasma?
Nozzle
What is standoff?
Tip to work distance
True or false? Only heavy duty PAC torches require cooling
False
At what amperage are PAC torches usually water cooled?
100 amps
Which type of torch is more accurate?
1. Air cooled
2. air injected
3. water cooled
4. water injected
- water injected
What can be used to reduce spatter buildup?
Anti-spatter spray
How can you repair cables with breaks in the insulation and exposed wires?
Replace with new cables
What is the other name for the ground cable?
Work peace lead
True or false? Plasma gas and secondary gases must match
False
What is the best gas for cutting stainless steel?
Nitrogen
What item is considered a consumable?
1. Air fittings
2. Cables and connecters
3. Electrode
4. PAC torch
- Electrode
What range can plasma tables size from in either direction?
2-100 ft
True or false? most plasma tables can accept CAD files
(Computer aided design (CAD) contains both 2-D and 3-D designs)
True
How do you reduce fumes, ultraviolet light, and noise on a plasma table?
By cutting on a water table
Aluminum should not be cut underwater with PAC because it could?
Explode
PAC current required and cutting speed depend on?
Material type and thickness
True or false? Excessive amperage is better than two little when PAC.
True
The three most cut medals with PAC are?
Low carbon steel, aluminum, and stainless steel
How can you tell if there is moisture in compressed air used in PAC?
Blow compressed air onto a lens or piece of glass and look for moisture
What is the most important factor to improve cut quality?
Travel speed
When cutting carbon steel at the correct travel speed what should the angle of the draglines be?
10 -15°
What happens when the nozzle touches the base metal?
Double arcing
