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 a 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 4 times that of mild steel.
What is the approximate melting points of the following materials?
a) aluminum
b) aluminum oxide
a) 660 degrees C (1220 degrees F)
b) 2037 degrees C )3700 degrees F)
Under the same conditions a section of aluminum would deflect ___ times as much as a similar section of mild steel.
Under the same conditions a section of aluminum would deflect 3 times as much as a similar section of mild 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 numbering 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 1050 aluminum alloy?
1050 aluminum alloys are 99.50% pure
In the Aluminum Association wrought aluminium alloy number system for 1XXX series, the last 2 digits indicate:
a) the alloy group
b) the aluminum alloy
c) the aluminum purity over 99.00%
d) modifications to the original alloy
c) the aluminum purity over 99.00%
What does the number 43 indicate in the filter wire designation of 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) types of heat treatment
b) product form
The aluminum wrought alloys in the groups 1XXX, 3XXX and 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, 6xxxx 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 can 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 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
What is the true of an ER5356 aluminum alloy?
a) there have been no modifications
b) it is 99.56% pure aluminum
c) it is heat-treatable aluminum
d) Magnesium is the major alloying element
d) Magnesium is the major alloying element
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)aluminum and silicon
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) in the gun itself, close to the contact tip
A pull type welding gun is designed to be used with
a) hard wires
b) soft wires
c) solid core wires
d) tubular wires
b) soft wires
What type of wire drive system allows greater machine-to-work distances?
a) push system
b) push-pull system
c) soft wires are taken through long liners
d) hard wires are taken through long liners
b) push-pull system
push-pull guns are an advantage when:
a) soft wires are taken through short liners
b) hard wires are taken through short winers
c) soft wires are taken through long liners
d) hard wires are taken through long liners
c) soft wires are taken through long liners
What type of metal transfer occurs with aluminum GMAW and 100% argon shielding?
a) short circuiting
b) globular
c) dip transfer
d) spray
d) spray
What is the most likely cause of porous, dirty, weld bead?
a) drag technique.
b) push technique
c) brushing the aluminum with a stainless steel brush
d) spray transfer mode
a) drag technique.
What is the likely cause of the wire melting back on 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
b) wire feed speed too low
