Plasma arc cutting and gouging Flashcards

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1
Q

What is plasma

A

plasma is a gas that has been heated to extreme temp by an electric arc.

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2
Q
in plasma arc cutting, plasma is the
A tungsten electrode
B electrons traveling across the arc
C ionized gas
D outer shielding gas
A

ionized gas

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3
Q

The plasma arc cutting process
A can only be used on materials 6.4mm thick or less
B can only be used on mild steel and stainless steal
C is used on materials that are electrically conductive
D is used mainly to clean up foundry spills

A

is used on materials that are electrically conductive

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4
Q

list 5 safety hazards associated with plasma arc cutting

A
Electric shock 
fumes
noise 
radiation
gases
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5
Q

any available welding power source may be used for PAC true or false

A

False

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6
Q

what are the functions of the plasma cutting torch

A

the plasma cutting torch functions are too current to an electrode, supply a flow of orifice gas to the contact nozzle and supply secondary shelving gas.

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7
Q
compressed air is. generally used for PAC on which materials 
A carbon steels
B Cooper alloys 
C magnesium 
D titanium
A

Carbon steel

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8
Q

What effect does improper PAC standoff distances have?

A

improper PAC standoff distances result in poor quality cuts, excessive nozzle wear and slow cutting speed

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9
Q

what type of power source is required for CAC-A

A

either AC or DC

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10
Q

what is the purpose of compressed air wit CAC-A

A

to remove molten metal

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11
Q

list 3 metals that give off toxic fumes when cut with the CAC-A process

A

beryllium
cadmium
lead

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12
Q

name the major components of the manual CAC-A electrode holder

A

the electrode holder are the power cable. the means to grip the electrode and the air passages and orifices to direct the air stream

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13
Q

electrodes for CAC-A are usually made of?

A

graphic and carbon

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14
Q

what is the maximum length that a CAC-A electrode should extend from the holder to the workpiece when gouging Carbon steel

A

180mm 7 inc

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15
Q

What is the range of air pressure normally used for CAC-A

A

the range of air pressure for CAC-A is 550 KPA to 700 KPA 80 psi to 100 psi

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16
Q

how are the air jets positioned when air carbon arc gouging in the flat position

A

toward the work, below the electrode

17
Q

how can you reduce carbon deposits on the joint surface when used CAC-A

A

use the proper air velocity and electrode movement. maintain a short arc without touching the electrode to the work without an air supply

18
Q

when is the surface hardening a problem when using CAC-A

A

when working on high carbon steels and cast irons

19
Q

with CAC-A when excessive slag adheres to the edges of the cut what is the likely cause?

A

Air pressure is to low