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chapter 3 > chapter 3 > Flashcards

chapter 3 Flashcards

1
Q

Which of the following is an important function of the slag in SMAW electrodes?
A) Control the penetration of the weld bead

B) Control the hydrogen in the weld bead

C) Control the current temperature

D) Protect the weld metal from contamination

A

D) Protect the weld metal from contamination

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2
Q

What is the specification for the use of covered filler materials for welding nickel and nickel alloys? (Multiple Choice)
Question options:

A) AWS A5.7

B) AWS A5.11

C) AWS A5.17

D) AWS A5.20

A

B) AWS A5.11

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3
Q

In the classification system for stainless steel electrodes, the letter “H” indicates: (Multiple Choice)
A) hydrogen.

B) helium.

C) carbon content in the upper range.

D) hydrogen in the lower level.

A

C) carbon content in the upper range.

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4
Q

What is the metal transfer characteristic of the E4918 electrode? (Multiple Choice)
Question options:

A) Spray

B) Globular

C) Mixed spray and globular

D) Spatter free

A

B) Globular

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5
Q

The chemical composition of the weld metal will vary with the shielding gas used. Because of this, the use of mixtures of argon with carbon dioxide will increase the level of: (Multiple Choice)
Question options:

A) carbon.

B) manganese and silicon.

C) chromium.

D) silicon and carbon.

A

B) manganese and silicon.

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6
Q

What is the oxide addition for an EWCe-2 tungsten electrode? (Multiple Choice)
Question options:

A) 2% thorium

B) 1.8-2.2%-CeO2

C) 2% Lanthanum

D) 1-2% Zirconium

A

B) 1.8-2.2%-CeO2

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7
Q

In the SAW electrode classification F49A3-EM12K, the 12 indicates: (Multiple Choice)
Question options:

A) 12% bonded flux.

B) 0.12% agglomerated or bonded flux.

C) impacts values of 27 Joules at -12°C.

D) 0.12% carbon.

A

B) 0.12% agglomerated or bonded flux.

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8
Q

E4310 and E4311 electrodes should not be baked because they need ______ moisture? (Multiple Choice)
Question options:

A) 3% to !0%

B) 3% t0 7%

C) 4% to 5%

D) 2% to 3%

A

B) 3% t0 7%

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9
Q

Many classifications of low-alloy steel electrodes in CSA W48 and AWS A5.5 require the mechanical testing to be carried out in the post-weld heat-treated (PWHT) condition. Why? (Multiple Choice)
Question options:

A) Because it’s a good idea

B) Because the weld metal is brittle in the as welded condition

C) Because the heat-affected zone is brittle

D) Because hardness in the weld zone and heat-affected zone increases

A

B) Because the weld metal is brittle in the as welded condition

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10
Q

Which SAW flux is used primarily to make single pass welds especially on oxidized base metals? (Multiple Choice)
Question options:

A) Neutral flux

B) Active flux

C) Basic flux

D) Acidic flux

A

B) Active flux

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11
Q

The detrimental effects of hydrogen can be worsened by: (Multiple Choice)

Question options:

A) using thin plates.

B) the reduction in carbon content.

C) the addition of preheat to a welding procedure.

D) high restraint.

A

C) the addition of preheat to a welding procedure.
ÉÉ

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12
Q

The term “diffusible hydrogen” is used to describe the action of an element that: (Multiple Choice)

Question options:

A) adds oxygen to the weld metal.

B) removes hydrogen from the weld metal.

C) adds hydrogen to the weld metal.

D) produces free oxygen in the weld metal.

A

C) adds hydrogen to the weld metal.

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13
Q

The colour code for a pure tungsten electrode is: (Multiple Choice)
Question options:

A) yellow.

B) red.

C) brown.

D) green.

A

D) green.

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14
Q

What is the main purpose of adding iron powder to an electrode coating? (Multiple Choice)
Question options:

A) To increase strength

B) To increase deposition rate

C) To increase corrosion protection to the weld

D) To add hardness to the weld

A

B) To increase deposition rate

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15
Q

What binder is used for the fabrication of coating welding electrodes? (Multiple Choice)
Question options:

A) Potassium

B) Sodium or potassium silicate

C) Iron oxide

D) Rutile

A

B) Sodium or potassium silicate

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16
Q

What melts first in some electrodes during the welding arc, the core wire or the coating? (Multiple Choice)
Question options:

A) They melt at the same time

B) The coating melts first

C) The core wire

D) The welders hands

A

A) They melt at the same time

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17
Q

The selection of the correct electrode classification for GTAW welding of aluminum depends primarily on: (Multiple Choice)
Question options:

A) the process and shielding gas.

B) the type of welding current AC or DC.

C) the aluminum alloy to be joined and the service condition.

D) the base metal, electrode, and process.

A

C) the aluminum alloy to be joined and the service condition.

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18
Q

The difference between a rod and electrode is: (Multiple Choice)
Question options:

A) a rod carries current and an electrode doesn’t.

B) an electrode carries a current and a rod does not.

C) both carry current.

D) both carry only voltage.

A

B) an electrode carries a current and a rod does not.

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19
Q

What are the three preferred welding processes for joining copper and its alloys? (Multiple Choice)
Question options:

A) SAW, SMAW, and GMAW

B) PAW, GTAW, and SMAW

C) GMAW, GTAW, and PAW

D) MAW, SMAW, and ESW

A

C) GMAW, GTAW, and PAW

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20
Q

The number “3” in the electrode classification B-G 49A 3 C1 S6 indicates: (Multiple Choice)

Question options:

A) the impact energy of 27 J at -30 °C.

B) the three alloying elements for deoxidizing.

C) the impact energy of 27 J at 30 °F.

D) the electrode is certified using 100% CO2 shielding gas.

A

C) the impact energy of 27 J at 30 °F.

21
Q

Which microstructure has more solubility for hydrogen? (Multiple Choice)
Question options:

A) Ferrite

B) Austenite

C) Martensite

D) Pearlite

A

B) Austenite

22
Q

The “J” designator in the the FCAW wire classification EXXXT-XMJ-HZ denotes: (Multiple Choice)

Question options:

A) that the electrode meets the requirements for improved toughness of 27 Joules at -40 °C.

B) that the electrode meets the requirements for impacts of 27 Joules at +40 °F.

C) that no specific mechanical properties tests are required.

D) that t a Jominy end-quench test has been completed for this wire class.

A

A) that the electrode meets the requirements for improved toughness of 27 Joules at -40 °C.

23
Q

A SAW flux that is manufactured by mixing carefully proportioned quantities and melting them together, cooled, followed by grinding to suitable size is known as: (Multiple Choice)
Question options:

A) an agglomerated flux.

B) an active flux.

C) a bonded flux.

D) a fused flux.

A

D) a fused flux.

24
Q

The number “0” in the electrode designation E308T0-1 indicates the electrode can be used for: (Multiple Choice)

Question options:

A) all position welds including vertical down.

B) vertical down fillets and grooves only.

C) overhead groove welds only.

D) flat groove and horizontal fillets only.

A

D) flat groove and horizontal fillets only.

25
Q

The shielding gas for FCAW can be confirmed by: (Multiple Choice)
Question options:

A) the gas provider only.

B) the need for concern.

C) the manufacturer.

D) the composition of the gas.

A

C) the manufacturer.

26
Q

Which aluminum alloys series produces the most the ductile weld deposits? (Multiple Choice)
Question options:

A) 1xxx and 5xxx

B) 2xxx and 6xxx

C) 3xxx and 4xxx

D) 6xxx only

A

A) 1xxx and 5xxx

27
Q

An electrode with the classification E4311 (CSA W48), is equivalent to which AWS classification? (Multiple Choice)
Question options:

A) E6010.

B) E6011.

C) E7010.

D) E7011.

A

B) E6011.

28
Q

SAW fluxes perform in a similar way to those used in SMAW electrodes, however they are designed to handle: (Multiple Choice)
Question options:

A) low amperage ranges.

B) higher extrusion pressures.

C) currents over 2000 amps.

D) only direct current electrodes.

A

C) currents over 2000 amps.

29
Q

If the slag is not removed in shielded metal arc welding of aluminum, this would cause: (Multiple Choice)
Question options:

A) nothing.

B) colour change of the weld seam.

C) corrosion.

D) porosity.

A

C) corrosion.

30
Q

One way to neutralize the effect of nitrogen with the self-shielded FCAW electrode process is to introduce nitride formers such as: (Multiple Choice)
Question options:

A) silicon, manganese, titanium, and nickel.

B) silicon and manganese.

C) manganese and calcium.

D) aluminum, magnesium, and titanium,

A

D) aluminum, magnesium, and titanium,

31
Q

The Wall Neutrality Number is a convenient measure of the comparative neutrality of a flux for use in welding carbon steels. For a flux to be considered neutral, it should have a Wall Neutrality Number of: (Multiple Choice)
Question options:

A) 50

B) 30

C) 40

D) 20

A

C) 40

32
Q

What is the newly adopted AWS specification for MCAW and FCAW wires? (Multiple Choice)
Question options:

A) AWS A5.36

B) AWS A5.18

C) AWS A5.17

D) AWS A5.19

A

A) AWS A5.36

33
Q

What is the difference between E4924 and E4924-1 electrodes? (Multiple Choice)
Question options:

A) No difference

B) E4924-1 is for higher temperature applications, E4924 is for low temperature applications

C) E4924-1 is for lower temperature applications and E4924 is for higher temperature applications

D) E4924-1 applies to a minimum impact strength of 27 Joules at -20 °C and 4924 is for normal temperatures

A

D) E4924-1 applies to a minimum impact strength of 27 Joules at -20 °C and 4924 is for normal temperatures

34
Q

E49XC-3 type tubular electrodes are: (Multiple Choice)
Question options:

A) metal-cored.

B) gas shielded flux cored.

C) self shielded flux cored.

D) solid wire electrode.

A

A) metal-cored.

35
Q

What is the colour code for a classification EWTh-2 tungsten electrode? (Multiple Choice)
Question options:

A) Red

B) Grey (formally orange)

C) Green

D) Brown

A

A) Red

36
Q

The arc transfer for metal cored arc welding using of a argon-carbon dioxide mixture is: (Multiple Choice)

Question options:

A) globular.

B) spray.

C) short circuit.

D) none of the above.

A

B) spray.

37
Q

An E4928 electrode can only be used in: (Multiple Choice)
Question options:

A) the vertical position.

B) the overhead position.

C) the flat position only.

D) the flat and horizontal position.

A

D) the flat and horizontal position.

38
Q

Most carbon steel gas shielded flux cored electrodes are classified using: (Multiple Choice)
Question options:

A) 98% Argon + 2% Oxygen.

B) 100% Argon.

C) Argon + Helium.

D) 100% Carbon Dioxide.

A

D) 100% Carbon Dioxide.

39
Q

Electrodes stamping for proper identification during manufacturing process is: (Multiple Choice)
Question options:

A) close to the handle.

B) in the middle.

C) at the tip.

D) only on the box.

A

A) close to the handle.

40
Q

Why is the concept of concentricity in the manufacturing of covered electrodes important? (Multiple Choice)
Question options:

A) Because it helps in the handling of the electrode

B) For cosmetic reasons

C) To facilitate the arc starting

D) None of the above

A

A) Because it helps in the handling of the electrode

41
Q

SAW classifications differ from other processes in that they designate: (Multiple Choice)
Question options:

A) the flux/wire combination.

B) the shielding gas/flux combination.

C) the wire/base metal combination.

D) the bonded/fused flux combination.

A

A) the flux/wire combination.

42
Q

A shielding gas with a substantially lower oxidation potential than recommended (such as argon) could result in: (Multiple Choice)
Question options:

A) an amount of silicon only.

B) an amount of impurities.

C) an amount of carbon.

D) a stronger weld deposit and reduced toughness.

A

D) a stronger weld deposit and reduced toughness.

43
Q

The letter “M” in the electrode classification F49A3-EM12K indicates: (Multiple Choice)

Question options:

A) the flux and wire combination.

B) the shielding gas and flux combination.

C) the medium manganese content.

D) the wire and base metal combination.

A
44
Q

What are the three most widely used arc welding processes for joining nickel and its alloys? (Multiple Choice)
Question options:

A) GTAW, GMAW, and SMAW

B) PAW, GTAW, and FCAW

C) SMAW, SAW, and FCAW

D) GMAW, GTAW, and PAW

A

A) GTAW, GMAW, and SMAW

45
Q

Preheating influences the diffusion of hydrogen in the weld zone as well as the heat-affected zone. How is this influence manifested? (Multiple Choice)
Question options:

A) Increased temperature of preheat speeds up the diffusion coefficient

B) Cooling the weld fast removes more hydrogen

C) Keeping the weld and heat-affected zone in the austenitic region

D) Keeping the weld and heat-affected zone in the ferritic region

A

A) Increased temperature of preheat speeds up the diffusion coefficient

46
Q

Some of the functions of the slag is that it needs to have proper viscosity, surface tension and _____________________. (Multiple Choice)
Question options:

A) colour.

B) texture.

C) freezing range.

D) free of toxicity.

A

C) freezing range.

47
Q

Agglomerated or bonded fluxes for SAW consist of mixtures of finely divided oxides or two or more metals and are agglomerated at a temperature between: (Multiple Choice)
Question options:

A) 1500 °C to 1800 °C.

B) 800 °C to 1000 °C.

C) 1000 °C to 1300 °C.

D) 1000 °C to 1500 °C.

A

B) 800 °C to 1000 °C.

48
Q

Heavily coated SMAW electrodes can have iron powder content up to: (Multiple Choice)
Question options:

A) 5%.

B) 15%.

C) 25%.

D) 55%.

A

D) 55%.

49
Q

To preserve the chemistry for multiple layer SAW applications the flux should be: (Multiple Choice)
Question options:

A) active.

B) basic.

C) neutral.

D) not important, as the mixture will neutralize.

A

C) neutral.

chapter 3 (14 decks)

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