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Welding 140 > SMAW > Flashcards

SMAW Flashcards

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1
Q

The SMAW process requires a _____ _____power source

a. alt. current
b. constant current
c. constant voltage
d. All above

A

b

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2
Q

the voltage decrease across a component due to the resistance to the flow of current.

a. voltage drop
b. open circuit voltage
c. working voltage
d. none

A

A

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3
Q

the most stable DC SMAW welding is provided by welding machines that have:

a. single phase transformers only
b. 3 phase
c. full wave rectifiers
d. b and c only

A

D

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4
Q

a power source has a duty cycle of 300A @ 32V, 60%. the machine can operate:

a. @ 100A for 5 out of 10 min,
b. @ 300A for 10 out of 10 min.
c. @ 32V for 10 out of 10 min.
d. @300A for 6 out of 10 min.

A

D

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5
Q

a welding machine designed for light-mediem duty welding would most likely have a rating of:

a. 400-600A
b. 150-200A
c. 250-300A
d. 50-80A

A

B

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6
Q

the coltage produced when a welding machine is ON but no welding would is being done is an

A

open circuit

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7
Q

the coltage present after an arc is struck and maintained…

A

voltage steps down from open circuit to welding arc/voltage

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8
Q

an electrical device that changes AC voltage from one lever to another…

A

transformer

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9
Q

an electrical device that changes AC into DC

A

rectifier

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10
Q

arc welding machine power sources that represent tha latest technology in size, weight, efficiency and control. a(n) _____ is an electrical device that changes DC into AC

A

inverter

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11
Q

_____ power sources play a critical roll in producing the high quality welds required on construction sites, bridges and cross country pipelines and for field repairs on heavy agricultural, construction, mining and military equipment.

A

engine-driven

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12
Q

the percentage of time during a specified(10 min.) period that a welding machine can be operated at its rated load without exceeding the temp. limits of the insulation on the component parts

A

duty cycle

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13
Q

the manner in which molten metal transfers from the end of the electrode across the welding arc to the weld pool.

a. arc length
b. travel speed
c. amp. range
d. metal transfer

A

D

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14
Q

an arc welding process that produces an arc between a consumable, coated electrode and the workpiece, creating a weld pool.

a. GTAW
b. SMAW
c. FCAW
d. OAW

A

b

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15
Q

a material that hinders or prevents the formation of oxides and other undesirable substance in molten metal.

a. flux
b. electrode
c. shielding
d. slag

A

A

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16
Q

the distance from the tip of the electrode core wire to the weld pool.

a. stick out
b. tip to work distance
c. arc length
d. travel angle

A

C

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17
Q

the layer of _____ that covers a deposited bead must be removed after welding. if a multi-pass weld is required, the_____ must be removed between each pass.

a. filler
b. weld
c. slag
d. none

A

C

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18
Q

A number 2 in the next to last digit of the electrode classification on an SMAW electrode, indicates the electrode may be used in all welding positions.

Select one:
True
False

A

False

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19
Q

Which of the following is an incorrect statement about an E7018 electrode?

Select one:

a. They are suitable for flat position and horizontal fillet only.
b. The weld deposit has a minimum tensile strength of 70,000 psi.
c. Once opened, it should be kept in an electrode oven.
d. They are suitable for use in all welding positions.

A

A

20
Q

Rectifiers are noted for their ability to

Select one:

a. control welding power.
b. reduce spatter.
c. eliminate arc blow.
d. change AC to DC.

A

D

21
Q

Arc blow” is caused by

Select one:

a. too low an amperage for the size of the electrode.
b. too high an amperage for the size of the electrode.
c. magnetic forces associated with direct current.
d. strong winds associated with outdoor welding.

A

C

22
Q

An engine-driven generator without a rectifier produces what form of welding current?

Select one:

a. Both AC and DC
b. DC only
c. AC and DCEP
d. AC only

A

D

23
Q

SMAW equipment is portable because the welding machines can be powered with gasoline or diesel engines.

Select one:
True
False

A

True

24
Q

Which of the following welding cable sizes is the largest?

Select one:

a. # 2/0
b. # 1/0
c. # 1
d. # 2

A

A

25
Q

Which group of electrodes is low hydrogen type?

Select one:

a. E7024, E7027, and E7028
b. E6012, E6013, and E7014
c. E7015, E7016 and E7018
d. E6010 and E6011

A

C

26
Q

Of the following, which is not a requirement for the SMAW process?

Select one:

a. Gas supply
b. Electricity
c. Base metal
d. Filler metal

A

A

27
Q

Excessive spatter and undercutting of weld joints can be caused by current values being set too high.

Select one:
True
False

A

True

28
Q

Which of the following electrodes would you select to produce a weld with shallow penetration?

Select one:

a. E6010
b. E6011
c. E6013
d. E7018

A

C

29
Q

A number 1 in the next to last digit of the electrode classification for SMAW electrodes, indicates that an electrode can be used in the flat position and on horizontal flat welds only.

Select one:
True
False

A

False

30
Q

The distance from the molten tip of the SMAW electrode to the surface of the molten weld pool should be

Select one:

a. one electrode diameter.
b. arc current.
c. ignition length.
d. open circuit voltage.

A

A

31
Q

The E6010 Electrode is run mostly on DCEN.

Select one:
True
False

A

False

32
Q

With direct current electrode positive (DCEP), the work piece is positive.

Select one:
True
False

A

False

33
Q

Which one of the following electrodes is not suitable for use in all positions?

Select one:

a. E6010
b. E7018
c. E7024
d. E6011

A

C

34
Q

When the welding machine is set to DCEP, current flows

Select one:

a. from the work to the electrode.
b. from the electrode to the work.
c. depending on the electrode being used.
d. both to and from the electrode.

A

A

35
Q

In North America, alternating current changes direction

Select one:

a. 240 times per second.
b. 120 times per second.
c. once per second.
d. 60 times per second.

A

D

36
Q

In order to reduce waste and control cost, you should weld until the electrode is

Select one:

a. four (4) inches from the core wire.
b. down to the core wire.
c. down to the classification numbers.
d. one half inch from the core wire

A

C

37
Q

“Duty cycle” is a term used to indicate the

Select one:

a. length of time required for the machine to cycle, expressed as a percentage run time.
b. Percentage of time in a machine which can do the type of work for which it was designed.
c. percentage of time in a 10 minute period a machine can operate at rated output.
d. percentage of time in a 24 hour cycle that a machine can operate at rated output.

A

C

38
Q

The first two (2) digits of the electrode classification indicate the

Select one:

a. positions in which the electrode can be used.
b. type of current with which the electrode can be used.
c. type of coating and operating characteristics of the electrode.
d. minimum tensile strength of the deposited weld

A

D

39
Q

The electrode classification that indicates a deep penetrating electrode that can be used with alternating current (AC) current is

Select one:

a. E6011
b. E6013
c. E6012
d. E6010

A

A

40
Q

The ________angle is in the plane of the weld joint and may vary from 5 to 30 degrees.

Select one:
A. current
B. arc
C. travel CorrectCorrect
D. workThe \_\_\_\_\_\_\_\_angle is in the plane of the weld joint and may vary from 5 to 30 degrees.
Select one:
A. current
B. arc
C. travel 
D. work
A

C

41
Q

Measures that can be taken to prevent arc blow include _______.

Select one:
A. all of these
B. using the shortest possible arc. 
C. reducing the welding current.
D. welding away from the workpiece connection.
A

A

42
Q

When cleaning slag from a weld, the correct procedure is to _______.

Select one:
A. chip slag away from the body.
B. all of these
C. after the slag is loosened, drag the point end of a chipping hammer along the weld.
D. remove the remaining particles of slag with a stiff wire brush.

A

B

43
Q

The E7024 electrode can be used in

Select one:

a. flat position and horizontal fillets only.
b. flat, horizontal and vertical down positions.
c. all positions.
d. flat, horizontal, vertical down and overhead positions.

A

A

44
Q

The last digit in the electrode classification E7018 indicates.

Select one:

a. Type of current and electrode coating.
b. minimum tensile strength of the electrode.
c. welding position the electrode can be used.
d. carbon content of the deposited weld.

A

A

45
Q

Back-stepping at the end of a weld made with the SMAW process

Select one:

a. puts too much heat on the electrode holder.
b. helps to prevent crater cracking.
c. reduces electrode stub loss.
d. is not done because it traps slag.

A

B

46
Q

A E6010 deep penetrating electrode belongs to the

Select one:

a. F4 Group.
b. F2 Group.
c. F3 Group.
d. F1 Group.

A

C

Welding 140 (1 decks)

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