Which of the following is a common issue when plasma cutting?
1.) Excess cutting tip stick out
2.) Excess build up on nozzle
3.) Excess plasma arc voltage
4.) Excess coolant pressure
Excess build up on nozzle
When CAC-A gouging steel, hearing protection:
1.) Is recommended
2.) Is required
Is required
What is the most commonly used shape for a CAC-A electrode?
1.) Flat
2.) Half Round
3.) Jointed
4.) Round Jointed
Round Jointed
When plasma cutting, cut quality improves:
1.) Near the top of the travel speed range
2.) Near the bottom of the travel speed range
3.) Near the top of the thickness range
4.) Near the bottom of the current range
Near the top of the travel speed range
Which CAC-A electrode is not recommended for jobs where accuracy is required?
1.) DC Uncoated electrodes
2.) None of the options
3.) AC Copper coated electrodes
4.) DC Copper coated electrodes
DC Uncoated electrodes
What position is CAC-A recommended to be performed in?
1.) Vertical
2.) Overhead
3.) Flat
4.) Horizontal
Flat
Troubleshooting CAC-A
Match the cause with the issue
1.) Air not on before striking arc.
2.) Wrong polarity.
3.) Low current.
4.) Touching electrode to work.
Hard, irregular start.
Sputtering arc, with electrode heating rapidly.
Sputtering arc, with electrode slow to heat.
Carbon deposit.
1.) Hard, irregular start.
2.) Sputtering arc, with electrode heating rapidly.
3.) Sputtering arc, with electrode slow to heat.
4.) Carbon deposit.
A defective weld can be gouged to sound metal and then the joint can be re-welded.
1.) True
2.) False
True
The carbon arc cutting process uses:
1.) A jet of swirling plasma to cause melting and blow away the steel
2.) Abrasive action from a high-pressure water jet
3.) A jet of compressed oxygen to burn the steel and blow it away
4.) An electric arc to melt metal while compressed air blows it away
An electric arc to melt metal while compressed air blows it away
The gas nozzle and electrode life will depend on:
1.) The length of time in the pilot arc mode.
2.) All of the above
3.) The number of cuts performed.
4.) The amperage setting.
All of the above
An advantage of CAC gouging, it can be done manual by hand or automatically with a machine.
1.) True
2.) False
True
What type of power source is preferred for CAC-A?
1.) DC (direct current)
2.) CV (constant voltage)
3.) CC (constant current)
4.) AC (alternating current)
CC (constant current)
Extra eye protection and care is required for CAC use. This is because the process ejects molten metal up to __________________ meters
1.) 4
2.) 6
3.) 3
4.) 5
6
When plasma cutting, which standoff produces the highest quality cut?
1.) A High Standoff
2.) A Low Standoff
A Low Standoff
To increase the life of internal components, the pilot arc often will shut off after ___________ seconds.
1.) 6
2.) 8
3.) 4
4.) 2
2
