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Welding > Cutting Chapter 3 > Flashcards

Cutting Chapter 3 Flashcards

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Welding Inspection Basics flashcards
1
Q

Plasma arc cutting uses a jet of plasma to what 3 things to metal?

A

Pierce
Cut
Gouge

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2
Q

How is the plasma created?

A

Super heating gas in an electric arc.

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3
Q

The temperature of the plasma is hot enough to melt what?

A

Any metal.

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4
Q

Plasma arc process can be set up for what two operations?

A

Manual

Mechanized

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5
Q

Plasma Arc in most cases is NOT faster and more efficient than any other cutting method.

A

F

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6
Q

PAC cuts ferrous and nonferrous metals.

A

T

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7
Q

Produces Max dros

A

F

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8
Q

Doesn’t create a minimal heat-affected zone

A

F

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9
Q

Causes little or no distortion

A

T

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10
Q

In the transferred arc process, the what is part of the electrical circuit as in other arc processes/

A

Workpiece

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11
Q

The arc is established between the what and the what?

And it is via what?

A

Electrode
Work

Arc Transfer Process

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12
Q

Larger industrial units are used for what two cuttings?

A

Heavy-duty manual cutting

General-duty mechanized cutting

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13
Q

What do PAC larger industrial units operate on?

A

Three phase 230/460VAC input power

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14
Q

PAC Larger industrial units can produce DC output currents up??

A

to 750 amperes.

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15
Q

The duty cycle of a PAC larger industrial unit usually is?

A

100 percent

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16
Q

PAC Larger industrial units can cut what 3 things?

A

Stainless steel
Aluminum up to 2.5” thick
Carbon steel up to 3” thick

17
Q

The most comon plasma arc cutting torch uses what 2 things?

A

Pilot Arc

Transferred Arc Process

18
Q

In many torches, a high frequency pilot arc is started between the what 2 things?

A

Electrode

Nozzle

19
Q

The typical plasma arc cutting torch usually contains what? 4 things

A

Replaceable Retaining Cup

Copper Electrode w/ a hafnium or thoriated tungsten insert

Gas Swirl Ring

Nozzle (tip)

20
Q

The most common parts that are changed in a torch are what 2 things?

A

Electrode

Nozzle

21
Q

If cutting will be done near a battery, the battery must be what?

A

Removed

22
Q

Why must the battery be moved during cutting?

A

Prevent hydrogen gas explosions caused by a cutting spark.

23
Q

The simplest units use what to cut 3 things

A

Clean compressed air

Carbon steel
Stainless steel
Aluminum up to about 3/16” thick

24
Q

Most heavy duty systems will require what 2 technically 4 things?

A

2 high-pressure cylinders

2 pressure regulators.

25
Q

One cylinder contains the what and the other is a what

A

Cutting gas

Shielding or cooling gas

26
Q

Light-gauge sheet steel may require as few as what amps?

While 2 inch aluminum plate may require how many amps?

A

7

250

27
Q

When should safety caps be kept with cylinders?

A

At all times

28
Q

Immediately after removing a cylinder’s regulator assembly, you do what?

A

Reinstall the safety cap over the cylinder valve.

29
Q

To pierce very thin metal, hold the torch directly over the point to be pierced at a what degree work angle?

Then press what?

A

0

The arc button

30
Q

As soon as the jet passes completely through the workplace you what?

A

Move the torch head in a smoot circle or other pattern to produce the desired diameter or shape for the hole.

31
Q

In cylinders are to be removed, be sure to what?

A

Remove the pressure regulators and replace the cylinder caps before releasing and moving the cylinders.

32
Q

If compressed air is used with a PAC unit, shop air may be used as long as it is what?

A

dry and free of oil/

33
Q

When properly set, the air pressure regulator and filter/dryer on the power source will maintain what

A

the correct pressure and flow rate for the system.

34
Q

A significant concern when using PAC equipment is that what?

Which can cause the torch to what?

A

moisture may enter the unit through the air line.

Sputter or Hiss

Welding (20 decks)

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