PPE/Safty
Which of the following PPE is considered optional for plasma arc cutting?
a. Hearing protection b. Safety glasses
c. A full leather hood d. High-top shoes or boots
c. A full leather hood
the 2 Consumables requiring frequent replacement?
torch Nozzle, and Electrode
what are 4 cut quality factors?
Air pressure, Amperage, standoff distance, travel speed.
What is the wasted byproduct of molten metal?
Dross
The simplest plasma arc cutting units use filtered _____.
a. carbon dioxide
b. nitrogen
c. compressed air
d. helium
c. compressed air
Which of the following safety statements related to plasma arc cutting is true?
a. A hot-work permit is not required for plasma arc cutting due to the nature of the process.
b. Both methane and propane are lighter than air and rise quickly from the work area if released.
c. Never carry matches or gas-filled lighters in your pockets.
d. Unlike oxyfuel cutting, a vessel can be cut safely with plasma regardless of its contents
c. Never carry matches or gas-filled lighters in your pockets.
The typical plasma arc cutting torch contains a _____.
a. deflector, retaining cup, extended nozzle, and extended electrode
b. gouge shield, retaining cup, gouging nozzle, and standard bronze electrode
c. deflector, gouge shield, retaining cup, and copper electrode
d. retaining cup, copper electrode with a hafnium or thoriated tungsten insert, gas swirl ring, and nozzle
d. retaining cup, copper electrode with a hafnium or thoriated tungsten insert, gas swirl ring, and nozzle
Recommended Stand off distance?
1/16- 1/4 (Dependent on Amperage)
The fourth state of matter. Created by heating gas to such a high temperature that it boils electrons off the gas molecules.
Plasma
In plasma arc cutting, plasma is created by _____. a. combining acetylene with acetone
b. exposing cutting gas to radioactive material
c. passing fuel gases through a large orifice inside the torch
d. superheating gas in an electric arc
d. superheating gas in an electric arc
True or False? A Shaded Lens is required for PAC
True
Some light-duty PAC equipment has a built-in _____.
a. water tank
b. argon gas cylinder
c. air compressor
d. battery-operated power supply
c. air compressor
To pierce very thin metal using plasma arc cutting, hold the torch at a _____.
a. 0-degree work angle
b. 10-degree work angle
c. 33-degree work angle
d. 45-degree work angle
a. 0-degree work angle
The unit of measure used for the intensity of an electric current.
Amperage
In most cases, plasma arc cutting is _____.
a. slower and less efficient than other cutting methods
b. faster and more efficient than other cutting methods
c. more likely to create large amounts of dross than other cutting methods
d. more likely to create a large heat-affected zone than other cutting methods
b. faster and more efficient than other cutting methods
Before Replacing any consumables you should do what?
Turn power off to machine
This Consumable produces a clockwise plasma swirl?
What side of the Kerf will be square?
Swirl Ring
Right Side
. The term standoff distance refers to the _____.
a. distance between the torch internal arc and the workpiece
b. length of the plasma arc
c. distance between the area being cut and the workpiece clamp
d. distance between the torch tip and the workpiece
d. distance between the torch tip and the workpiece
Percentage of on time a machine can handle within a 10 min period.
Duty Cycle
Cutting a 2" (5 cm) aluminum plate requires a(n) _____.
a. low gas flow rate
b. high-cutting amperage
c. low-cutting amperage
d. oxygen/air plasma/shield gas combination
b. high-cutting amperage
When gas cylinders are disconnected from a plasma arc cutting unit before it is stored, be sure to _____.
a. install a cap on the regulator outlet
b. set the regulator to its maximum setting
c. lay all cylinders down on their side
d. replace the cylinder caps
d. replace the cylinder caps
Most heavy-duty plasma arc cutting systems require one gas cylinder containing the cutting gas and another containing _____.
a. shielding or cooling gas
b. water vapor
c. acetylene
d. a mixture of cutting gas and shielding gas
a. shielding or cooling gas
Industrial plasma cutting units can cut carbon steel up to _____.
a. 1" thick
b. 3" thick
c. 5" thick
d. 7" thick
b. 3" thick
Why is a respirator required when cutting stainless steel.
Chromium 6 ( hexavalent chrome)
The most common plasma arc cutting torch uses _____.
a. a pilot arc with the transferred arc process
b. a pilot arc with the nontransferred arc process
c. contact starting with the oxyfuel pilot process
d. discharge starting with the common arc process
a. a pilot arc with the transferred arc process