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Cutting And Gouging Processes > Carbon Arc Cutting (CAC– A) > Flashcards

Carbon Arc Cutting (CAC– A) Flashcards

1
Q

What type of eye protection must always be worn during carbon arc cutting

A

Safety glasses

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2
Q

what shade lens is recommended for CAC – A cutting at less than 500 Amps

A

12

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3
Q

True or false? Gouging is a very loud process

A

True

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4
Q

What is the most important thing in reducing the risk of electric shock when using CAC-A

A

Do not run cables through water, Keep electrodes and torches dry, and keep your gloves dry

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5
Q

What must you check before touching an electric shock victim

A

Make sure they are not still in contact of the circuit

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6
Q

Gouging can shoot sparks and molten metal up to?

A

6 m ( 20 ft)

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7
Q

Why do you not want to play spark shields too close to where you are working?

A

Sparks can bounce back and burn you

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8
Q

Combustible materials should be moved how many metres away

A

15 m (50ft)

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9
Q

What type of electrode is used in CAC – A?

A

Carbon

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10
Q

What type of power source is generally used with CAC-A?

A

Constant current

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11
Q

How many psi (kPa) is required for a gouging torch?

A

82-100 psi (551-689 kPa)

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12
Q

A medium duty torch uses how many cubic feet per minute (cam) of compressed air?

A

25 cfm (700L/m)

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13
Q

What can CAC-A be used to do?

A

Cut, gouge, & wash a surface

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14
Q

True or false? CAC-A is used for removing weld defects

A

True

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15
Q

True or false? CAC-A can be used to cut most types of ferrous and nonferrous metals

A

True

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16
Q

Which polarity is recommended for carbon and low alloy steel?

A

DCEP (direct current electrode positive)

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17
Q

Welding power sources used for CAC-A are recommended to have what percentage duty cycle?

A

100%

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18
Q

What is the minimum recommended open circuit voltage of a CAC-A?

A

60 V

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19
Q

Machine gouging with an automatic electrode feeder is typically done with what power source?

A

Constant voltage CV

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20
Q

True or false? DC electrodes can be used with AC power

A

False

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21
Q

When electrode diameter goes up what does amperage requirements do?

A

Increase

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22
Q

To connect two power sources together you must ensure what?

A

Ensure they are connected in parallel, ensure to follow the manufactures directions, and ensure they are identical. 

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23
Q

In CAC-A, what will insufficient air supply cause?

A

Carbon buildup

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24
Q

What gas can be used as an alternative to compressed air?

A

Nitrogen

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25
Q

Hoses and fittings for medium and heavy duty gouging must have an inside diameter of?

A

3/8 in (10mm)

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26
Q

What is the biggest difference between a SMAW and CAC-A electrode holder?

A

Air jet holes

27
Q

Air jet holes are found?

A

Between the electrode and work peace

28
Q

How many times should the electrode holder be examinated for wear and damage before use?

A

Daily

29
Q

What size cable is commonly used for CAC-A?

A

4/0

30
Q

CAC-A Electrode holders contain an electrical cable and what?

A

Air supply hose

31
Q

True or false? Working above a cable rated capacity can cause overheating?

A

True

32
Q

The workplace lead must be connected where?

A

As close to the work area as possible

33
Q

Who is responsible to ensure equipment is safe to use?

A

Employee

34
Q

What does the copper coating on DC copper coated electrodes do?

A

Improves electrode life, improves heat dissipation, and maintains the electrode shape

35
Q

DC copper coated electrodes come in size ranging from 5/32 in (4mm) to?

A

1in (25.4 mm)

36
Q

Uncoated electrodes are mainly used for?

A

Demolition

37
Q

AC copper coated electrodes contain?

A

Arc stabilizers

38
Q

CAC-A Electrodes come in how many different shapes?

A

4

39
Q

Jointed electrodes are designed to?

A

Be joined together

40
Q

True or false? Flat electrodes are usually used to remove weld reinforcement or backing material.

A

True

41
Q

Groove width is usually how many inches larger than the electrode diameter?

A

1/8 in (3.2mm)

42
Q

1/4 in diameter DC electrodes require 200 to how many amps?

A

400 amps

43
Q

You should replace an electrode when it gets down to how many millimetres or inches long?

A

50mm or 2 inches

44
Q

True or false? CAC-A stubs should not be thrown on the floor as they can cause a slipping hazard?

A

True

45
Q

Is most CAC-A cutting done manually or by machine?

A

Manually

46
Q

What do most CAC-A cutting machines consist stuff?

A

Motorized carriage, power supply, and track

47
Q

How do fully automatic machine controlled electrodes feed rate?

A

By Sensing arc voltage or amperage

48
Q

Electrode angle for cutting is almost what degree to the base metal?

A

90°

49
Q

CAC-A is typically done with a pushing or pulling technique?

A

Pushing

50
Q

What type of cut does a steeper electrode angle produce?

A

Deeper

51
Q

What type of groove will a straight up and down electrode produce?

A

V-Shaped

52
Q

Slower travel speed will produce a groove that is?

A

Deeper

53
Q

What is the indicator for correct travel speed?

A

A steady hissing sound

54
Q

True or false? Higher current settings produce larger grooves.

A

True

55
Q

What do you do if you do not have enough air supply?

A

Decrease travel speed

56
Q

Electrode stick out should be?

A

4-6 in (101-152mm)

57
Q

An electrode should be repositioned when it is how many inches from the torch?

A

1 1/2 - 2in ( 38-50mm)

58
Q

How do you strike an arc with CAC-A?

A

By touching the electrode to the base metal momentarily

59
Q

True or false? You want to avoid touching the electro to the base metal as it causes contamination

A

True

60
Q

What do you want to ensure before starting to gouge?

A

air valve is opened all the way, air jets are positioned between the electrode and workplace, and the stick out is correct

61
Q

True or false? Gouging can be done in all positions

A

True

62
Q

Gouging in the vertical position is usually done in the uphill or downhill direction?

A

Downhill

63
Q

What removes the molten metal from the groove?

A

The compressed air

64
Q

How can Harden areas produced by CAC-A be removed?

A

By grinding

Cutting And Gouging Processes (2 decks)

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