Cutting Chapter 3 Flashcards
Plasma arc cutting uses a jet of plasma to what 3 things to metal?
Pierce
Cut
Gouge
How is the plasma created?
Super heating gas in an electric arc.
The temperature of the plasma is hot enough to melt what?
Any metal.
Plasma arc process can be set up for what two operations?
Manual
Mechanized
Plasma Arc in most cases is NOT faster and more efficient than any other cutting method.
F
PAC cuts ferrous and nonferrous metals.
T
Produces Max dros
F
Doesn’t create a minimal heat-affected zone
F
Causes little or no distortion
T
In the transferred arc process, the what is part of the electrical circuit as in other arc processes/
Workpiece
The arc is established between the what and the what?
And it is via what?
Electrode
Work
Arc Transfer Process
Larger industrial units are used for what two cuttings?
Heavy-duty manual cutting
General-duty mechanized cutting
What do PAC larger industrial units operate on?
Three phase 230/460VAC input power
PAC Larger industrial units can produce DC output currents up??
to 750 amperes.
The duty cycle of a PAC larger industrial unit usually is?
100 percent
PAC Larger industrial units can cut what 3 things?
Stainless steel
Aluminum up to 2.5” thick
Carbon steel up to 3” thick
The most comon plasma arc cutting torch uses what 2 things?
Pilot Arc
Transferred Arc Process
In many torches, a high frequency pilot arc is started between the what 2 things?
Electrode
Nozzle
The typical plasma arc cutting torch usually contains what? 4 things
Replaceable Retaining Cup
Copper Electrode w/ a hafnium or thoriated tungsten insert
Gas Swirl Ring
Nozzle (tip)
The most common parts that are changed in a torch are what 2 things?
Electrode
Nozzle
If cutting will be done near a battery, the battery must be what?
Removed
Why must the battery be moved during cutting?
Prevent hydrogen gas explosions caused by a cutting spark.
The simplest units use what to cut 3 things
Clean compressed air
Carbon steel
Stainless steel
Aluminum up to about 3/16” thick
Most heavy duty systems will require what 2 technically 4 things?
2 high-pressure cylinders
2 pressure regulators.