Review Questions - SMAW

Question 1

DCEN polarity is an arrangement where the work lead is connected to the negative terminal of the power supply?

1. true
2. false

Answer 1

false

Question 2

For the SMAW process, which type of power supply is preferable?

1. variable current
2. constant voltage
3. variable pulsing
4. constant current

Answer 2

constant current

Question 3

Excessive spatter and undercutting of a weld bead can be caused by:

1. high current
2. high voltage
3. high arc length
4. high travel speed

Answer 3

high current

Question 4

When a power source is set to the high end of a low range how does the power source respond to a longer arc?

1. increase current
2. decreases current
3. current is constant
4. current is pulsed

Answer 4

decreases current

Question 5

Select the correct statement about welding cables.

1. voltage drop will decrease as diameter increases
2. diameter must decrease as length increases
3. diameter has little effect on current capacity
4. diameter must increase as duty cycle decreases

Answer 5

voltage drop will decrease as diameter increases

Question 6

When using an E4918 electrode, the arc is seen to be pulsing. What is the likely cause?

1. cables too small
2. arc too long
3. power source on CV
4. wrong polarity

Answer 6

wrong polarity

Question 7

Select the correct statement about an E4918 (E7018) electrode.

1. it should be kept in an electrode oven
2. the minimum tensile strength is 550 MPa (80,000psi)
3. it is suitable for the vertical down position
4. it is suitable only for root passes in hardenable steels

Answer 7

it should be kept in an electrode oven

Question 8

Which electrode is not suitable for overhead position welding?

1. E6010/4310
2. E6011/4311
3. E7018/4918
4. E7048/4948

Answer 8

E7048/4948

Question 9

What is the effect of increasing current?

1. more penetration
2. narrower bead
3. slower travel speed
4. thicker slag cover

Answer 9

more penetration

Question 10

Which electrode can be used to check for polarity?

1. E7018
2. E6011
3. E6010
4. 309L

Answer 10

E6010

Question 11

An electrode holder is rated by which of the following?

1. its voltage carrying capacity
2. the diameter of the electrode it can hold
3. size of the cable it is attached to
4. its amp carrying capacity

Answer 11

its amp carrying capacity

Question 12

Which electrode requires a relative humidity of 20 to 70% moisture?

1. EXX18
2. EXX28
3. EXX10
4. EXX15

Answer 12

EXX10

Question 13

Which type of electrode should not be stored in a rod oven?

1. cellulosic
2. basic
3. titania
4. 309L

Answer 13

cellulosic

Question 14

Electrodes should be stored in a rod oven at what temperature?

1. 120 °C
2. 212 °C
3. 375 °C
4. 450 °C

Answer 14

120 °C

Question 15

Electrodes that are exposed to the environment for more than 4 hours should be?

1. rebaked at 650 °C
2. thrown out
3. rebaked at 450 °C
4. rebaked at 370-430 °C or as recommended by the manufacturer

Answer 15

rebaked at 370-430 °C or as recommended by the manufacturer

Question 16

Which electrode is most suitable for the joining of mild steel to stailess steel?

1. 309L
2. 6013
3. EXX18 SS-MS
4. E7024

Answer 16

309L