Line D

Question 1

What melts the surfaces of the joint when performing shielded metal arc welding (SMAW)?

1) The flow of current
2) The heat of the arc
3) Contact of the electrode with work
4) Contact of the ground clamp with work

Answer 1

2) The heat of the arc

Question 1

How is the shielding established in SMAW?

1) By the amount of current being used
2) By the solidified slag covering the weld
3) By the metal droplets crossing into the joint
4) By the protective gas from the electrode coating

Answer 1

4) By the protective gas from the electrode coating

Question 2

Who is responsible to ensure that workers are trained in the care and use of protective equipment when welding?

1) The employer
2) The individual doing the work
3) The engineer
4) The supervisor overseeing the work

Answer 2

1) The employer

Question 3

What is the suggested lens shade number for protection during SMAW at 160-250 amps?

1) Shade 7
2) Shade 8
3) Shade 10
4) Shade 12

Answer 3

4) Shade 12

Question 4

How is electrical current measured?

1) In voltage
2) In amperes
3) In polarity
4) In resistance

Answer 4

2) in amperes

Question 5

What is one advantage of welding on alternating current (AC)?

1) The risk of electric shock is lower than on direct current (DC)
2) There is a wider range of electrodes available
3) The arc is stable and smooth
4) Arc blow is rarely a problem

Answer 5

4) Arc blow is rarely a problem

Question 6

What must be done to change from welding on direct current electrode positive (DCEP) to welding on direct current electrode negative (DCEN)?

1) By using a polarity switch or by reconnecting the cables
2) By relocating the ground clamp or changing electrodes
3) By adjusting the amperage dial or by reconnecting the cables
4) By using a polarity switch or adjusting the amperage dial

Answer 6

1) By using a polarity switch or by reconnecting the cables

Question 6

What condition exists when the power source is, but no arc has been struck yet?

1) Arc voltage
2) Open circuit voltage
3) Closed circuit voltage
4) Short circuit voltage

Answer 6

2) Open Circuit Voltage

Question 7

What happens to the relationship between current and voltage if arc length is increased?

1) Both current and arc voltage will increase
2) Arc voltage is reduced while current is increased
3) Current is reduced while arc voltage is increased
4) Both current and arc voltage will decrease

Answer 7

3) Current is reduced while arc voltage is increased

Question 8

What type of welding power source generates only alternating current (AC)?

1) Engine drive
2) Inverter
3) Rectifier
4) Transformer

Answer 8

4) Transformer

Question 9

What must be done to alternating current (AC) to change it to direct current (DC)?

1) Use a transformer to step up AC output from an inverter
2) Use diodes to rectify AC output from a transformer
3) Use a thyrister to rectify DC output from a transformer
4) Use an SCR to alternate DC output from a rectifier

Answer 9

2) Use diodes to rectify AC output from a transformer

Question 10

What must be done to minimize the loss of power and prevent overheating of welding cables when shielded metal arc welding?

1) consider the amount of current being used and distance from the work
2) conder the type of current and available utility voltage for the power source
3) use the largest available size cable and coil up access cable
4) use the smallest available cable and use as short a length as possible

Answer 10

1) consider the amount of current being used and distance from the work

Question 11

What cable size should be used when welding with a 300 amp power source?

Look at table

Answer 11

1/0

Question 12

How can the flux coating on a welding electrode alter the chemical composition of the weld?

1) With the addition of iron and alloy powders in the flux coating
2) By forming a solidified slag covering over the weld
3) By establishing an ionized gas shielding around the arc
4) With an increased arc length and slower travel speed

Answer 12

1) With the addition of iron and alloy powders in the flux coating

Question 13

Which material, when incorporated into the flux coating of an electrode, will increase weld metal penetration into the base material?

1) Potassium
2) Rutile
3) Fluorspar
4) Cellulose

Answer 13

4) Cellulose

Question 14

What is the function of the third digit of an electrode?

Answer 14

Position for operation

Question 15

Which of the following is a characteristic of an E4310 (E6010) electrode?

1) Cellulose, Sodium all position
2) Low hydrogen, all position
3) Cellulose, titania, all position
4) Rutile, iron powder, all position

Answer 15

1) Cellulose, sodium, all position

Question 16

Considering the electrode classification E308-16, what is the significance of the number 308?

1) It represents the tensile strength and position of a stainless steel electrode
2) It represents the approximate carbon content of a mild steel electrode
3) It represents the specific alloy of a stainless steel electrode
4) It represents the approximate percentage of nickel alloy in a steel electrode

Answer 16

3) It represents the specific alloy of a stainless steel electrode

Question 17

Which of the following is an acceptable storage temperature for an E4818 (E7018) electrode?

1) 10°C above ambient temperature
2) 20°C above ambient temperature
3) 140°C above ambient temperature
4) 350°C above ambient temperature

Answer 17

3) 140°C above ambient temperature

Question 18

Why is it unacceptable to place cellulosic electrodes (EXX10) in a holding oven with other electrodes?

1) They are designed to have 3% to 7% moistures levels
2) They must be stored at temperatures higher than other electrodes
3) They have 25% to 35% moisture levels
4) They must be stored in their own holding oven

Answer 18

1) They are designed to have 3% to 7% moistures levels

Question 19

CSA W59-18?
When assembling two plates in a lap joint, what is the minimum amount of overlapping needed according

1) a dimension not to exceed the actual thickness of the material being joined
2) two times the actual thickness of the thicker plate being joined
3) four times the thickness of either of the members being joined
4) five times the thickness of the thinner of the two members being joined

Answer 19

4) five times the thickness of the thinner of the two members being joined

Question 20

Which letter illustrates the size of the weld?

Answer 20

X

Question 21

What is the approximate work angle when shielded metal arc welding in the 2F position?

1) approximately 0°
2) approximately 20°
3) approximately 30°
4) approximately 45°

Answer 21

4) approximately 45

Question 22

How does welding vertical up impact the required travel angle when shielded metal arc welding?

1) the electrode should be pointed opposite of the direction of travel about 10° to 20°
2) the electrode should be pointed toward the direction of travel about 10° to 20°
3) the electrode angle should be perpendicular to the direction of travel (90°)
4) the electrode angle should be parallel to the direction of travel (0°)

Answer 22

2) the electrode should be pointed toward the direction of travel about 10° to 20°

Question 23

What is the maximum amount of side to side motion when performing a weave bead when shielded metal arc welding? 1) an amount equal to 2-1/2 times the diameter of the electrode 2) an amount equal to 2 1/2 times the thickness of the base metal 3) an amount equal to the thickness of the base metal 4) an amount equal the diameter of the electrode

Answer 23

1) an amount equal to 2-1/2 times the diameter of the electrode

Question 24

What is the general rule that can be used to determines the arc length while shielded metal arc welding? 1) the arc length should the diameter of the electrode core wire 2) the arc length should be about two times the diameter of the electrode 3) arc length is determined by the thickness of the base metal 4) arc length is increased as the amperage is increased

Answer 24

1) the arc length should the diameter of the electrode core wire

Question 25

What must be done during shielded metal arc welding if the electrode melts too fast and the puddle becomes too large to control? 1) increase the arc length 2) reduce the travel speed 3) reduce the amperage 4) increase the amperage

Answer 25

3) reduce the amperage

Question 26

How does hot-popping of slag affect the process of welding stainless steel? 1) slag is expelled from the weld violently during welding which disrupts depositing the bead 2) slag is expelled from the weld violently as the bead cools causing an injurious condition 3) slag is expelled from the weld when it is in service causing an injurious condition to workers 4) slag is expelled from the weld during the molten metal transfer causing slag inclusions

Answer 26

2) slag is expelled from the weld violently as the bead cools causing an injurious condition

Question 27

What is the most serious hazard regarding fume generation when welding stainless steel? 1) carbon monoxide 2) phosgene gas 3) particulate saturation 4) hexavalent chromium

Answer 27

4) Hexavalent chromium

Question 28

What is added to an electrode coating to increase deposition rate? 1) Fluorspar 2) Cellulose 3) Rutile 4) Iron Powder

Answer 28

4) Iron powder

Question 29

power source rated with a 60 percent duty cycle at 300 amps is capable of welding? 1) welding at 300 amps for 8 minutes out of every 10 2) welding at 300 amps for 36 minutes out of every hour 3) welding at 180 amps for 6 minutes out of every 10 4) Welding at 300 amps for 6 minutes out of every 10

Answer 29

4) Welding at 300 amps for 6 minutes out of every 10

Question 30

Which type of welding power source is the most efficient? 1) transformer 2) transformer rectifier 3) inverter 4) engine drive

Answer 30

3) inverter

Question 31

What is an advantage of an engine driven power source? 1) mobile 2) inexpensive 3) faster welding speeds 4) quiet

Answer 31

1) Mobile

Question 32

How far away from the welding area should you move flammable materials? 1) 5m (16ft) 2) 10m (32ft) 3) 15m (50ft) 4) 20m (65ft)

Answer 32

3) 15m (50ft)

Question 33

What is known as the electrical pressure in a circuit? 1) voltage 2) amperage 3) resistance 4) ohms

Answer 33

1) Voltage

Question 34

What is the problem with excessive convexity? 1) Excessive convexity is a cosmetic issue due to poor profile 2) Excessive convexity produces sharp corners at the weld toes 3) Excessive convexity produces a smooth transition to the base metal 4) Excessive convexity is rejectable due to increased reinforcement

Answer 34

2) Excessive convexity produces sharp corners at the weld toes

Question 35

How can angular distortion be prevented when welding a T joint? 1) By placing welds on one side of a joint 2) By placing welds on both sides of the joint 3) By increasing amperage and using weave beads 4) By clamping the base plate to the work surface

Answer 35

2) By placing welds on both sides of the joint

Question 36

What causes distortion in a welded assembly? 1) residual stress from welding 2) not enough amperage when welding 3) welding on thick sections 4) welding with faster travel speeds

Answer 36

1) Residual stress from welding