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Second Year Welding > Smaw Equipment > Flashcards

Smaw Equipment Flashcards

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Welding Inspection Basics flashcards
1
Q

Which term describes the voltage output of the machine while you are welding

A

Arc voltage

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2
Q

What do you create when current flows through a coil wrapped around an iron core

A

A magnetic field

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3
Q

Manufacturers design this device in a welding machine to have a certain number of turns of wire

A

Coil

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4
Q

The main function of which device is to change AC to DC

A

Rectifier

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5
Q

Which term describes the NEMA rating of a welding machine

A

Duty cycle

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6
Q

Which term describes the influence that a magnetic field exerts on neighbouring bodies without physical contact

A

Inductance

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7
Q

Electrode negative is

A

Straight polarity

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8
Q

Which term describes a noisy uncontrollable arc that flares from side to side

A

Arc blow

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9
Q

Which term describes a medium that provides an electrical path through which current can flow

A

Conductor

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10
Q

Which current flows in one direction only and has either a positive or negative value

A

Direct current

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11
Q

Which of the following is a graphical illustration that plots the relationship between voltage and amperage output of a welding power source

A

Volt amp curve

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12
Q

Which term expresses the strength of a current of electricity

A

Amperage

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13
Q

When no current is flowing in circuit but the machine is on you can measure the

A

Open circuit voltage

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14
Q

The speed at which AC changes direct is the

A

Frequency

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15
Q

In welding what do you create when enough amperage and voltage exists to overcome the natural resistance to the flow of the electricity

A

Arc

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16
Q

For what does EMF stand for

A

Electromotive force

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17
Q

Which term describes a material that can stop current flow through itself

A

Insulator

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18
Q

Electrode positive means

A

Reverse polarity

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19
Q

Which term describes the typical sound of an AC transformer type welding machine

A

Buzz box

20
Q

This type of welding machine is capable of changing DC to high frequency AC

A

Inverter

21
Q

Which is the largest cable size

A

4/0

22
Q

Overheating of the cable connections can result from

A

Poor work lead connection

23
Q

How do you rate electrode holders

A

By amperage carrying capacity

24
Q

Loose work lead connections when using SMAW may cause

A

Arcing at the work clamp

25
Q

An advantage to using a magnetic work lead device over a spring loaded clamp is that the magnetic connection

A

Less likely to damage the work piece

26
Q

If the welding cable from the machine is size 1/0 then the whip cable should be what size

A

2

27
Q

What is the approximate length of a normal arc

A

Same as the diameter of the core wire

28
Q

What happens when you increase the arc length

A

Amperage decreases and voltage increases

29
Q

What happens when you decrease the arc length

A

Deeply penetrating narrow bead with more build up

30
Q

Strength or volume of a current
Referred to as heat
Metal deposition rate
Penetration

A

Amperage

31
Q

Pressure or force
Referred to as electro motive force
Or potential
Arc length controls it
Puddle fluidity

A

Voltage

32
Q

Short arc

A

Higher amps
Lower volts
Deep narrow penetration

33
Q

Normal arc

A

Same Amps and volts
Depending on electrode diameter size

34
Q

Long arc

A

Lower amps
Higher volts
Less penetration wider puddle

35
Q

How to fix arc blow

A

Change to AC machine
Change position of ground clamp
Lower heat setting
Weld towards existing tack
Change inclination

36
Q

Constant current

A

SMAW and GTAW
Dropping curve

37
Q

Constant voltage

A

Wire feed
Relatively flat line

38
Q

Volts needed to start the arc

A

50-100 volts

39
Q

Volts needed to maintain the arc

A

17-40 volts

40
Q

Welding wire
#4, 3, 2, 1, 1/0, 2/0, 3/0, 4/0

A

Most resistant to least resistance

41
Q

Reverse polarity (DCRP)

A

Electrode positive
Work piece negative

Electrode melts slower
Welding speed is slower
2/3 heat is found in base metal
Deeper penetration
1/3 heat is electrode giving narrow higher weld profile

42
Q

Straight polarity (DCSP or DCEN)

A

Electrode negative
Work positive

Electrode melts faster
Welding is faster
1/3 heat in base metal
Shallow penetration
2/3 heat in electrode
Wider flatter welds

43
Q

Controls penetration

A

Amperage

44
Q

Which type of welding machine is best suited for SMAW welding

A

Constant current

45
Q

Stingers are rated by …….

A

Their current carrying capacity

46
Q

What regular maintenance should a welder do to a welding machine

A

Blow out with low pressure high volume air

Second Year Welding (13 decks)

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