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Mild Steel Electrodes > SMAW One > Flashcards

SMAW One Flashcards

0
Q

The ultimate pull that a material will withstand is called:

A) yield strength
B) tensile strength
C) ductility
D) elasticity

A

B) tensile strength

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1
Q

The ability of a metal to permanently deform under load without breaking is known as:

A) ductility
B) brittleness
C) toughness
D) elasticity

A

A) ductility

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2
Q

Impact tests, such as Izod & Charpy, are designed to measure:

A) the weld metals hardness
B) the weld metals ductility
C) the ability of the weld to withstand abrasion
D) the welds impact strength

A

D) the welds impact strength

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3
Q

The point at which a material begins to deform permanently under load is called its:

A) yield point
B) ultimate tensile strength
C) ductile fracture point
D) brittleness limit

A

A) yield point

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4
Q

Dynamically loaded structures are subject to:

A) constant pressure
B) reversals of stress
C) loads that do not impact
D) stationary loading conditions

A

B) reversals of stress

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5
Q

A static load means that the load will:

A) shift quickly from side to side
B) be applied and removed slowly
C) be steady and relatively unchanging
D) be subjected to stress reversals or constant vibration

A

C) be steady and relatively unchanging

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6
Q

Which is the best example of a statically loaded structure?

A) the boom of a crane making a lift, and then swinging the load
B) the frame of a loaded and moving gravel truck
C) an air compressor receiver tank
D) the column supporting the wall in a building

A

D) the column supporting the wall in a building

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7
Q

Electrodes used in SMAW are often called:

A) consumable electrodes
B) non-consumable electrodes
C) core wire electrodes
D) wrapped electrodes

A

A) consumable electrodes

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8
Q

Electrode specifications are written by:

A) AWS and WCB
B) CSA and NEMA
C) CSA and AWS
D) ASME and NEMA

A

C) CSA and AWS

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9
Q

In the AWS classification for SMAW mild steel electrodes, what does the last digit represent?

A) the type of shielding gas produced by the melting flux
B) the amount of metallic powder that is added to the coating
C) the welding position in which the electrode may be satisfactorily operated
D) the major ingredient in the coating and recommended current for best results

A

D) the major ingredient in the coating and recommended current for best results

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10
Q

What do the first two digits in the AWS classification for carbon steel SMAW electrodes represent?

A) current type
B) as-welded minimum tensile strength
C) recommended welding positions
D) iron powder content of the coating in %

A

B) as-welded minimum tensile strength

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11
Q

In the CSA numbering system for welding electrodes, what does the prefix letter E represent?

A) electronic
B) energized
C) electrode
D) electromotive force

A

C) electrode

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12
Q

According to AWS, which number indicates the positions an E7024 can be used in?

A) first number
B) second number
C) third number
D) fourth number

A

C) third number

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13
Q

The CSA system used what term to measure tensile strength?

A) kilo pascals
B) joules per square metre
C) megapascals
D) watts per square metre

A

C) megapascals

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14
Q

Which set of characteristics best describes the electrode E4914?

A) mineral coating, 50% metallic powder, AC or DCSP
B) lime coating, 40% metallic powder, AC or DCRP
C) rutile coating, 30% metallic powder, AC or DC either polarity
D) cellulose coating, 10% metallic powder, AC or DCRP

A

C) rutile coating, 30% metallic powder, AC or DC either polarity

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15
Q

E7024 electrodes are designed to be used in which positions?

A) all positions
B) flat and horizontal positions only
C) flat position only
D) vertical downhill position only

A

B) flat and horizontal positions only

16
Q

What is the difference between E7018 and an E7028 electrode?

A) E7018 has a lime-type coating; E7028 does not
B) E7018 can be used in all positions; E7028 cannot
C) E7018 has metallic powder in the coating; E7028 does not
D) E7018 is for static loading; E7028 is for dynamic loading

A

B) E7018 can be used in all positions; E7028 cannot

17
Q

Which electrode is restricted to welding in the flat position only?

A) E7038
B) E7027
C) E7024
D) E7014

A

A) E7038

18
Q

Which electrode has the least amount of metallic iron powder in its coating?

A) E6010
B) E7014
C) E7018
D) E 7028

A

A) E6010

19
Q

What is one difference between an E7010 electrode and an E7018 electrode?

A) core wire
B) minimum as-welded tensile strength
C) coating
D) recommended welding positions

A

C) coating

20
Q

What is one characteristic of an E6010 electrode?

A) deep penetration into the base metal
B) produces a low hydrogen type weld deposit
C) shallow penetration into the base metal
D) wide metal flow and very fluid puddle

A

A) deep penetration into the base metal

21
Q

What is the major differences between the coatings of an E4310 and an E4311 electrode?

A) there is no difference
B) an E4310 requires moisture but an E41011 does not.
C) an E4310 has potassium added as an arc stabilizer for AC welding
D) an E4311 has potassium added as an arc stabilizer for AC welding

A

D) an E4311 has potassium added as an arc stabilizer for AC welding

22
Q

Why is iron powder added to the coatings of some electrodes?

A) to prevent the core wire from rusting
B) to increase the rate of weld deposit
C) to help bind the element in the coating
D) to decrease the sulphur content in the weld

A

B) to increase the rate of weld deposit

23
Q

Which electrode has a cellulose coating?

A) E6010
B) E6013
C) E7014
D) E7018

A

A) E6010

24
Q

Which electrode contains the highest amount of iron powder in its coating?

A) E6010
B) E6011
C) E6013
D) E7014

A

D) E7014

25
Q

What is the purpose of the flux coating on the weld electrode?

A) to promote the formation of oxides and nitrites in the weld
B) to prevent undercut and arc blow, and minimize distortion
C) to prevent the formation of a gaseous shield around the molten weld metal
D) to protect the molten weld puddle from atmospheric contamination

A

D) to protect the molten weld puddle from atmospheric contamination

26
Q

Which last digit, in the classification of a SMAW mild steel electrode, describes a flux that is lime-based?

A) 0
B) 1
C) 4
D) 8

A

D) 8

27
Q

What is one function of the slag produced from electrode coatings?

A) to add more nitrites and oxygen to the weld
B) to help maintain the arc and control penetration
C) to add alloying elements to the weld deposit
D) to prevent the weld from cooling to rapidly

A

D) to prevent the weld from cooling to rapidly

28
Q

Adding large amounts of iron powder to electrode coatings would limit welding to which positions?

A) overhead
B) vertical
C) flat and horizontal
D) downhill

A

C) flat and horizontal

29
Q

Which statement is true about the slag produced when welding with a coated electrode?

A) speeds up the freezing rate of the molten metal
B) helps prevent oxygen and nitrogen from contaminating the weld
C) speeds up the cooling rate of solidified weld metal
D) distorts the shape of the deposit if not removed quickly

A

B) helps prevent oxygen and nitrogen from contaminating the weld

30
Q

What is the likely effect of using low hydrogen electrodes with a moisture content that exceeds acceptable limits?

A) the weld will probably have porosity and may develop hydrogen induced cracking
B) the slag produced will be difficult to remove, resulting in slag inclusions on subsequent passes
C) the excess steam rising out of the protective gaseous shield will make it hard to see the puddle
D) the deposited weld metal will look too much like the deposit of a cellulose-coated electrode

A

A) the weld will probably have porosity and may develop hydrogen induced cracking

31
Q

What is the main purpose for keeping low hydrogen electrodes dry?

A) to assist in producing and maintaining a stable, smooth arc
B) to minimize the possibility of hydrogen-induced cracking
C) to increase the electrodes deposition rate
D) to increase the shelf life of the electrodes storage

A

B) to minimize the possibility of hydrogen-induced cracking

32
Q

What is the recommended moisture content for E6010 electrode coatings?

A) 0 - 2%
B) 3 - 7%
C) 8 -10%
D) 11 -14%

A

B) 3 - 7%

33
Q

Proper handling of electrodes includes following the manufacturers recommendations regarding:

A) the physical properties of the base metal
B) the core wire diameter if electrode being used
C) welding position and amperage settings
D) storage and reconditioning procedures

A

D) storage and reconditioning procedures

34
Q

To weld thin materials, you would likely select an electrode with:

A) deep penetration characteristics
B) a large diameter core wire
C) a small diameter core wire
D) a high as-welded tensile strength

A

C) a small diameter core wire

35
Q

Which electrode works best for the root bead on groove welds with an open gap?

A) E4313
B) E4928
C) E4310
D) E4924

A

C) E4310

36
Q

What is the major advantage of using an E4310 for the root bead, and E4918 electrodes for fill passes on one welded joint?

A) the company can save money on the cost of electrodes because E4310 electrons are cheaper
B) it is easier on the welding machine if the amperage changes periodically and E4310 electrodes use lower amperages
C) it takes advantage of the penetration qualities of the E4310 and the mechanical properties of the E4918
D) it will determine if welders can follow specific procedures before they attempt the B pressure test

A

C) it takes advantage of the penetration qualities of the E4310 and the mechanical properties of the E4918

37
Q

It is important to know the chemical and mechanical properties of the base metal so you can select an electrode with the correct:

A) diameter
B) current requirements
C) length
D) flux coating

A

D) flux coating

38
Q

Which electrode would be the best choice if the base metal properties were unknown?

A) E7018
B) E7014
C) E6011
D) E7024

A

A) E7018

Mild Steel Electrodes (1 decks)

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