Deck 22: Plasma Arc Cutting

Question 1

A ____ arc is an arc between the electrode tip and the nozzle tip within the torch head.

A) standard
B) nontransfer
C) plasma
D) pilot

Answer 1

D

Question 2

Plasma machines cannot cut cast iron.

Answer 2

False

Question 3

A(n) ____ may be used as a guide so that the torch can be dragged across the work surface.

A) nozzle tip
B) nozzle insulator
C) nozzle
D) electrode tip

Answer 3

C

Question 4

The term ____ is the term most often used in the welding industry when referring to the arc plasma used in welding and cutting processes.

A) plasma arc
B) arc plasma
C) plasma welding
D) plasma cutting

Question 5

A ____ must have a high-voltage rated insulation, and it is made of finely stranded copper wire to allow for maximum flexibility of the torch.

A) control wire
B) gas hose
C) water tube
D) power cable

Question 6

The glowing mass of a star and the bright light from a fluorescent lightbulb are both plasma.

Question 7

Small plasma cutting machines can do many of the same cutting jobs that are done with an oxyacetylene torch, but without the expense of renting gas cylinders.

Question 8

Minimizing the amount of time that the pilot arc is on before the cutting plasma is initiated can decrease the operational life of the electrode tip and nozzle.

Question 9

Most manual plasma arc cutting speeds are around ____ in. per minute. Any faster and it would be difficult for you to accurately follow the line.

A) 10
B) 14
C) 18
D) 20

Question 10

A ____ is a two-conductor, low-voltage, stranded copper wire that connects the power switch to the power supply.

A) water tube
B) control wire
C) power cable
D) gas hose

Question 11

Some low-powered PAC torches will operate with as low as ____ amps of current flow.

A) 10
B) 12
C) 18
D) 20

Question 12

The production of plasma does not require a constant-current power supply.

Question 13

The use of a copper/tungsten tip in the torch increases the quantity of work it can produce.

Question 14

Plasma cutters have the unique ability to cut metals without making them very hot.

Question 15

A(n) ____ is the space left in the metal as the metal is removed during a cut.

A) electrode setback
B) cup
C) kerf
D) standoff distance

Question 16

Setting the amperage to the lowest possible level will extend the life of the torch parts.

Question 17

A(n) ____ helps to protect the internal parts from accidentally shorting out to the work.

A) nozzle insulator
B) nozzle tip
C) nozzle
D) electrode tip

Question 18

The term ____ is defined as gas that has been heated to at least a partially ionized condition, enabling it to conduct an electric current.

A) arc cutting
B) arc plasma
C) arc welding
D) plasma arc

Question 19

Although the total power used by both plasma and nonplasma processes is similar, the actual energy input into the work per linear foot is more with plasma.

Question 20

Too high a gas flow results in a cut having excessive dross and sharply beveled sides.

Question 21

____________________ is a metal compound that resolidifies and attaches itself to the bottom of a cut.

Question 22

____________________ cutting is helpful when you are cutting out a number of duplicate sheet metal parts.

Question 23

The spacing between the electrode tip and the nozzle tip, called ____________________, is critical to the proper operation of the torch system.

Question 24

____________________ is a matter that is highly conductive and easily controlled and shaped by a magnetic field.

Question 25

____________________ is the distance from the nozzle tip to the work. This distance is very critical to producing quality plasma arc cuts.