Aluminum and Aluminum Welding Flashcards
Which metal is lighter than aluminum?
a) magnesium
b) copper
c) steel
d) manganese
a) magnesium
Aluminum is a reactive metal. What is meant by reactive?
-A reactive metal is one that readily reacts with other elements.
-Aluminum reacts very quickly with oxygen to form aluminum oxides.
Aluminum has a refractory oxide. What is refractory oxide?
-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.
How does the electrical and thermal conductivity of aluminum compare with that of mild steel?
The electrical and thermal conductivity of aluminum is approximately four times that of mild steel.
What are the approximate melting points of the following materials?
a) aluminum __________________
b) aluminum oxide _____________
a) aluminum __ 660°C (1220°F)
b) aluminum oxide __2037°C (3700°F)
Under the same conditions(Load), a section of aluminum would deflect______ times as much as a similar section of mild steel.
Under the same load, a section of aluminum would deflect___three___times as much as a similar section of steel.
What process may be used to enhance the aluminum oxide film for increased corrosion resistance?
Anodizing increases the thickness of the oxide layer.
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.
c) twice that of steel.
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) the alloy group.
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.
d) modifications to the original alloy.
What is the purity of a 1050 aluminum alloy?
1050 aluminum alloys are 99.50% pure.
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.
c) the aluminum purity is over 99.00%
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
b) the alloys added
Which aluminum alloy contains substantial amounts of magnesium?
a) AA 1030
b) AA 2014
c) AA 5356
d) AA 4043
c) AA 5356
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
b) product form
The aluminum wrought alloys in the groups 1XXX, 3XXXand 5XXX series are:
a) heat-treatable.
b) non-heat treatable.
c) hardenable.
d) temperable.
b) non-heat treatable.
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) heat-treatable.
How can the mechanical properties of heat-treated aluminum alloys be restored after welding?
The properties may be restored by heat-treating again.
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.
d) solution heat-treating.
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)
b) A (anodized)
The mechanical properties of _________________________ aluminum alloys are improved by cold working and drawing.
- The mechanical properties of ___non-heat treatable ___aluminum alloys are improved by cold working and drawing.
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
b) ER4043 and ER5356
When welding a 6061-T6 alloy, which filler metal alloy is generally the best choice?
ER4043
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
b) matching base metal and filler metal chemistry and mechanical properties
