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W.I-W3 > Aluminum and Aluminum Welding > Flashcards

Aluminum and Aluminum Welding Flashcards

1
Q

Which metal is lighter than aluminum?
a) magnesium
b) copper
c) steel
d) manganese

A

a) magnesium

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2
Q

Aluminum is a reactive metal. What is meant by reactive?

A

-A reactive metal is one that readily reacts with other elements.

-Aluminum reacts very quickly with oxygen to form aluminum oxides.

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3
Q

Aluminum has a refractory oxide. What is refractory oxide?

A

-Refractory oxide means that the oxide is difficult to melt, reduce or work.
-The oxide of aluminum melts at a much higher temperature than the parent metal.

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4
Q

How does the electrical and thermal conductivity of aluminum compare with that of mild steel?

A

The electrical and thermal conductivity of aluminum is approximately four times that of mild steel.

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5
Q

What are the approximate melting points of the following materials?
a) aluminum __________________
b) aluminum oxide _____________

A

a) aluminum __ 660°C (1220°F)
b) aluminum oxide __2037°C (3700°F)

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6
Q

Under the same conditions(Load), a section of aluminum would deflect______ times as much as a similar section of mild steel.

A

Under the same load, a section of aluminum would deflect___three___times as much as a similar section of steel.

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7
Q

What process may be used to enhance the aluminum oxide film for increased corrosion resistance?

A

Anodizing increases the thickness of the oxide layer.

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8
Q

The coefficient of linear expansion of aluminum is approximately:
a) equal to that of steel.
b) half that of steel.
c) twice that of steel.
d) four times that of steel.

A

c) twice that of steel.

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9
Q

In the Aluminum Association wrought aluminum alloy numbering system, the first digit indicates:
a) the alloy group.
b) the aluminum alloy.
c) the aluminum purity over 99.00%.
d) modifications to the original alloy.

A

a) the alloy group.

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10
Q

In the Aluminum Association wrought aluminum alloy number system, the second
digit indicates:
a) the alloy group.
b) the aluminum alloy.
c) the aluminum purity over 99.00%.
d) modifications to the original alloy.

A

d) modifications to the original alloy.

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11
Q

What is the purity of a 1050 aluminum alloy?

A

1050 aluminum alloys are 99.50% pure.

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12
Q

In the Aluminum Association wrought aluminum alloy number system for 1XXX series, the last two digits indicate:
a) the alloy group.
b) the aluminum alloy.
c) the aluminum purity is over 99.00%.
d) modifications to the original alloy.

A

c) the aluminum purity is over 99.00%

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13
Q

What does the number 43 indicate in the filler wire designation ER4043?
a) the carbon content
b) the alloys added
c) the minimum purity
d) the percentage of magnesium added

A

b) the alloys added

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14
Q

Which aluminum alloy contains substantial amounts of magnesium?
a) AA 1030
b) AA 2014
c) AA 5356
d) AA 4043

A

c) AA 5356

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15
Q

What does the fourth digit indicate for an aluminum alloy casting?
a) minimum aluminum content
b) product form
c) modifications of the original alloy
d) type of heat treatment

A

b) product form

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16
Q

The aluminum wrought alloys in the groups 1XXX, 3XXXand 5XXX series are:
a) heat-treatable.
b) non-heat treatable.
c) hardenable.
d) temperable.

A

b) non-heat treatable.

17
Q

The aluminum wrought alloys in the groups 2XXX, 6XXX and 7XXX series are:
a) heat-treatable.
b) non-heat treatable.
c) unworkable.
d) unused.

A

a) heat-treatable.

18
Q

How can the mechanical properties of heat-treated aluminum alloys be restored after welding?

A

The properties may be restored by heat-treating again.

19
Q

Heating an aluminum alloy to a temperature below its melting point for a specified period of time and then quenching from this temperature is called:
a) tempering.
b) hardening.
c) aging.
d) solution heat-treating.

A

d) solution heat-treating.

20
Q

Non-heat treatable wrought alloys are designated with several levels of mechanical properties. Which does not indicate a mechanical property designation?
a) H1 (work hardened only)
b) A (anodized)
c) O (fully annealed)
d) F (as fabricated)

A

b) A (anodized)

21
Q

The mechanical properties of _________________________ aluminum alloys are improved by cold working and drawing.

A
  1. The mechanical properties of ___non-heat treatable ___aluminum alloys are improved by cold working and drawing.
22
Q

Which two filler metals may be used to weld most weldable aluminum alloys?
a) ER1100 and ER3003
b) ER4043 and ER5356
c) ER5083 and ER5454
d) ER6061 and ER6351

A

b) ER4043 and ER5356

23
Q

When welding a 6061-T6 alloy, which filler metal alloy is generally the best choice?

A

ER4043

24
Q

What is the primary consideration when selecting a filler metal when using GMAW on aluminum?
a) the amperage and voltage settings
b) matching base metal and filler metal chemistry and mechanical properties
c) the temper designation of the base metal
d) the type of joint to be welded

A

b) matching base metal and filler metal chemistry and mechanical properties

25
Q

Which is true of an ER5356 aluminum alloy?
a) There have been no modifications.
b) It is 99.56% pure aluminum.
c) It is a heat-treatable aluminum.
d) Magnesium is the major alloying element.

A

d) Magnesium is the major alloying element.

26
Q

What type of alloy is an ER4043 filler wire?
a) aluminum and silicon
b) aluminum and magnesium
c) aluminum and manganese
d) silicon and manganese

A

a) aluminum and silicon

27
Q

Where are the drive rolls located on a pull type drive system?
a) in the gun itself, close to the contact tip
b) in the main wire feed unit
c) on the drum some distance behind the wire feeder
d) the same place as on a push type system

A

a) in the gun itself, close to the contact tip

28
Q

A pull type welding gun is designed to be used with:
a) hard wires.
b) soft wires.
c) solid core wires.
d) tubular wires.

A

b) soft wires.

29
Q

What type of wire drive system allows greater machine-to-work distances?
a) push system
b) push-pull system
c) 2 drive roll system
d) 4 drive roll system

A

b) push-pull system

30
Q

Push-pull guns are an advantage when:
a) soft wires are taken through short liners.
b) hard wires are taken through short liners.
c) soft wires are taken through long liners.
d) hard wires are taken through long liners.

A

c) soft wires are taken through long liners.

31
Q

What type of metal transfer occurs with aluminum GMAW and 100% argon shielding?
a) short circuiting
b) globular
c) dip transfer
d) spray

A

d) spray

32
Q

What is the most likely cause of a porous, dirty weld bead?
a) drag technique
b) push technique
c) brushing the aluminum with a stainless steel brush
d) spray transfer mode

A

a) drag technique

33
Q

What is the most likely cause of the wire melting back onto the contact tip?
a) wire feed speed too high
b) wire feed speed too low
c) welding with a forehand technique
d) diameter of the wire matches the drive rolls

A

b) wire feed speed too low

W.I-W3 (4 decks)

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