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Millwright Level 2 > Electric Arc Welding > Flashcards

Electric Arc Welding Flashcards

1
Q

This shade is used for low amperage sheet metal welding

A

9

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2
Q

This shade is used for low to medium amperage

A

10

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3
Q

This shade is made for medium amperage

A

11

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4
Q

This shade is made for medium to high amperage heavy welding and gouging

A

12

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5
Q

This shade is made for high amperage heavy welding and gouging

A

14

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6
Q

Do not repair spliced within this much of an electrode holder

A

3m (10 feet)

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7
Q

Welding machines are classified into these two groups

A 
Constant current (SMAW)
Constant Voltage (GMAW)
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8
Q

An electric current that has positive and negative values alternately

A

Alternating current (AC)

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9
Q

An electric current flow in one direction only

A

Direct current (DC)

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10
Q

The unit of measurement used in expressing the rate of current flow

A

Ampere (Amp)

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11
Q

The measurement of electron movement in an electrical circuit

A

Current flow

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12
Q

The electrical pressure or force that causes current to flow

A

Voltage (Does not flow in a circuit)

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13
Q

The three types of constant current sources

A

Transformers
Inverters
Generators

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14
Q

300 Amps at 60% duty cycle means this

A

300 amps for only 6 minutes of every 10 minutes of operation

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15
Q

Condition from where extensive dc welding has been done at high heats, has a noisy, blowing sound

A

Arc blow

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16
Q

The 8 sizes of welding cables

A

Smallest 4, 3, 2, 1, 1/0, 2/0, 3/0, 4/0 Largest

17
Q

Using a lighter cable 12 to 15 feet attached to the stinger is called this

A

A whip

18
Q

Has the electrode connected to the negative terminal

A

Straight polarity (electrode negative)

19
Q

Has the electrode connected to the positive terminal

A

Reverse polarity (electrode positive)

20
Q

The most common length of electrode

A

14 inches

21
Q

SMAW means

A

Shielded metal arc welding

22
Q

The general rule for setting amperage on the welding machine

A

Convert the electrode diameter from a fraction to thousandths of an inch (ex 1/8 = 0.125)

23
Q

CSA number breakdown

A

First to digits indicate tensile strength in megapascals divided by 10
The last two digits same as AWS system

24
Q

AWS number breakdown

A

First two digits the minimum tensile strength in thousands of pounds per square inch
Third digit indicates welding position
Last digit indicates type of coating and polarity that should be used

25
Q

The positions an electrode can be used

A

1 - All positions
2 - Flat and horizontal
3 - Flat only
4 - Flat and down only

26
Q

Identified by small pit holes and is an indication of gases trapped in the weld

A

Porosity

27
Q

Low hydrogen electrodes should be in an over of this temperature

A

120 C (250F)

28
Q

Electrodes with cellulose coatings (E6010) should have moisture in the coating of these percentages

A

between 5-7%

29
Q

The size of a fillet weld is determined by this

A

The leg length of the largest triangle that may be drawn within the cross section of the weld
(Strength determined by throat size and largest triangle)

30
Q

A bead run with no side motion

A

Stringer bead (two to three times size of electrode)

31
Q

Bead used as a cover pass for lap and butt welds and building up

A

Weave bead (Four to six times size of electrode)

32
Q

4 kinds of weld passes

A

Root pass, fill pass, cover pass, fill and finish pass

33
Q

The slope or inclination of the electrode in the direction of travel or against the direction of travel

A

Electrode inclination

34
Q

The angle of the electrode in relation to the angle formed by the parts to be joined

A

Electrode angle

35
Q

Four types of weld faults

A

Porosity, slag inclusion, undercut, cracking

36
Q

Developed to weld carbon and low allow steels using carbon dioxide (Co2) as a shielded gas

A

MIG welding

37
Q

Arc welding process that uses a solid continuous wire with a shielding gas

A

Gas Metal-Arc welding (GMAW)

Millwright Level 2 (10 decks)

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