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23: Review Questions
Which of the following statements is
not
true?
A. Plasma is an ionized gas.
B. Plasma conducts electricity.
C. Plasma is present only in welding and cutting processes that use a constricting nozzle.
D. Plasma is a state of matter.
List four advantages of PAC.
True or False?
Power supplies for PAC are usually constant voltage machines using direct current electrode negative (DCEN).
A. True
B. False
True or False?
An inverter power supply is usually heavier than a non-inverter power supply.
A. True
B. False
List the two parts of the PAC torch that need to be replaced most often.
What gas or gas mixture is the most commonly used for manual PAC?
Before cutting begins, the area must be inspected and be free of flammable items. List four items that should not be present in a cutting area.
The pilot arc occurs between the electrode and the _____.
What distance should the PAC torch nozzle be above the base metal when cutting?
To cut 1/4″ (6 mm) thick mild steel at a rate of 40 inches per minute, the current would be set to approximately _____. Use the values presented in Figure 23-10.
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