Smaw Equipment

Question 1

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

Answer 1

Arc voltage

Question 2

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

Answer 2

A magnetic field

Question 3

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

Answer 3

Coil

Question 4

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

Answer 4

Rectifier

Question 5

Which term describes the NEMA rating of a welding machine

Answer 5

Duty cycle

Question 6

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

Answer 6

Inductance

Question 7

Electrode negative is

Answer 7

Straight polarity

Question 8

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

Answer 8

Arc blow

Question 9

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

Answer 9

Conductor

Question 10

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

Answer 10

Direct current

Question 11

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

Answer 11

Volt amp curve

Question 12

Which term expresses the strength of a current of electricity

Answer 12

Amperage

Question 13

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

Answer 13

Open circuit voltage

Question 14

The speed at which AC changes direct is the

Answer 14

Frequency

Question 15

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

Answer 15

Arc

Question 16

For what does EMF stand for

Answer 16

Electromotive force

Question 17

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

Answer 17

Insulator

Question 18

Electrode positive means

Answer 18

Reverse polarity

Question 19

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

Answer 19

Buzz box

Question 20

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

Answer 20

Inverter

Question 21

Which is the largest cable size

Answer 21

4/0

Question 22

Overheating of the cable connections can result from

Answer 22

Poor work lead connection

Question 23

How do you rate electrode holders

Answer 23

By amperage carrying capacity

Question 24

Loose work lead connections when using SMAW may cause

Answer 24

Arcing at the work clamp

Question 25

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

Answer 25

Less likely to damage the work piece

Question 26

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

Answer 26

2

Question 27

What is the approximate length of a normal arc

Answer 27

Same as the diameter of the core wire

Question 28

What happens when you increase the arc length

Answer 28

Amperage decreases and voltage increases

Question 29

What happens when you decrease the arc length

Answer 29

Deeply penetrating narrow bead with more build up

Question 30

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

Answer 30

Amperage

Question 31

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

Answer 31

Voltage

Question 32

Short arc

Answer 32

Higher amps Lower volts Deep narrow penetration

Question 33

Normal arc

Answer 33

Same Amps and volts Depending on electrode diameter size

Question 34

Long arc

Answer 34

Lower amps Higher volts Less penetration wider puddle

Question 35

How to fix arc blow

Answer 35

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

Question 36

Constant current

Answer 36

SMAW and GTAW Dropping curve

Question 37

Constant voltage

Answer 37

Wire feed Relatively flat line

Question 38

Volts needed to start the arc

Answer 38

50-100 volts

Question 39

Volts needed to maintain the arc

Answer 39

17-40 volts

Question 40

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

Answer 40

Most resistant to least resistance

Question 41

Reverse polarity (DCRP)

Answer 41

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

Question 42

Straight polarity (DCSP or DCEN)

Answer 42

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

Question 43

Controls penetration

Answer 43

Amperage

Question 44

Which type of welding machine is best suited for SMAW welding

Answer 44

Constant current

Question 45

Stingers are rated by …….

Answer 45

Their current carrying capacity

Question 46

What regular maintenance should a welder do to a welding machine

Answer 46

Blow out with low pressure high volume air