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Exam 22: Plasma Arc Cutting

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Question 1

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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.

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Question 2

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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.

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Question 3

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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.

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

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

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

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

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

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

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

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.

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

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.

Plasma machines cannot cut cast iron.

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

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

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

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

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