GMAW Welds on Aluminum 2 questions
with verified answers
Up to what length of contact tip is best suited for GMAW with aluminum filler wires?
a) 25.4 mm (1")
b) 50.8 mm (2")
c) 76.2 mm (3")
d) 101.6 mm (4") - correct answer ✔✔d) 101.6 mm (4")
List three (3) advantages of using GMAW on aluminum. - correct answer ✔✔Any three (3) of the
following are correct.
a) high deposition rates compared to GTAW
b) can be used long distances from the power source
c) no flux or slag; no inclusions in the weld metal
d) clean up time is reduced or eliminated
e) may be used in all positions
f) works well on materials 3.2 mm (1/8") and up
g) works well for spot welding operations
Which aluminum filler metal is not recommended for sustained high temperature service?
a) 2319
b) 4145
c) 4043
d) 5356 - correct answer ✔✔d) 5356
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. - correct answer ✔✔c) soft wires are taken through long
liners.
What type of conduit liner is recommended for aluminum wires? - correct answer ✔✔nylon or Teflon
What factors should be considered when setting GMAW welding parameters? - correct answer ✔✔For
GMAW on aluminum, material thickness, alloy type and available equipment should be considered when
setting welding parameters
What affect does stickout have on arc length with GMAW on aluminum? - correct answer ✔✔Due to the
high electrical conductivity of aluminum, the electrical stickout is not as critical as that required for steel.
The resistance of the aluminum wire is almost the same for a long stickout as it is for a short stickout.
Therefore, very little change in arc length is noticed with various stickout distances.
After pre-cleaning aluminum, you should weld the joint:
a) with a copper backing bar to prevent oxide contamination.
b) before it dries to prevent cracking.
c) after age hardening has occurred.
d) as soon as all liquids have evaporated from the joint area. - correct answer ✔✔d) as soon as all liquids
have evaporated from the joint area
What precaution must be taken when using heavy wire brushing or an abrasive grinding disc to remove a
heavy oxide layer from aluminum? - correct answer ✔✔Heavy brushing or abrasive discs tend to drive
the aluminum oxides into the metal surface entrapping them resulting in possible contamination of the
weld.
What are the two most commonly used filler metals for GMAW on aluminum?
a) 2319 and 4145
b) 4145 and 5356
c) 4043 and 4047
d) 4043 and 5356 - correct answer ✔✔d) 4043 and 5356
with verified answers
Up to what length of contact tip is best suited for GMAW with aluminum filler wires?
a) 25.4 mm (1")
b) 50.8 mm (2")
c) 76.2 mm (3")
d) 101.6 mm (4") - correct answer ✔✔d) 101.6 mm (4")
List three (3) advantages of using GMAW on aluminum. - correct answer ✔✔Any three (3) of the
following are correct.
a) high deposition rates compared to GTAW
b) can be used long distances from the power source
c) no flux or slag; no inclusions in the weld metal
d) clean up time is reduced or eliminated
e) may be used in all positions
f) works well on materials 3.2 mm (1/8") and up
g) works well for spot welding operations
Which aluminum filler metal is not recommended for sustained high temperature service?
a) 2319
b) 4145
c) 4043
d) 5356 - correct answer ✔✔d) 5356
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. - correct answer ✔✔c) soft wires are taken through long
liners.
What type of conduit liner is recommended for aluminum wires? - correct answer ✔✔nylon or Teflon
What factors should be considered when setting GMAW welding parameters? - correct answer ✔✔For
GMAW on aluminum, material thickness, alloy type and available equipment should be considered when
setting welding parameters
What affect does stickout have on arc length with GMAW on aluminum? - correct answer ✔✔Due to the
high electrical conductivity of aluminum, the electrical stickout is not as critical as that required for steel.
The resistance of the aluminum wire is almost the same for a long stickout as it is for a short stickout.
Therefore, very little change in arc length is noticed with various stickout distances.
After pre-cleaning aluminum, you should weld the joint:
a) with a copper backing bar to prevent oxide contamination.
b) before it dries to prevent cracking.
c) after age hardening has occurred.
d) as soon as all liquids have evaporated from the joint area. - correct answer ✔✔d) as soon as all liquids
have evaporated from the joint area
What precaution must be taken when using heavy wire brushing or an abrasive grinding disc to remove a
heavy oxide layer from aluminum? - correct answer ✔✔Heavy brushing or abrasive discs tend to drive
the aluminum oxides into the metal surface entrapping them resulting in possible contamination of the
weld.
What are the two most commonly used filler metals for GMAW on aluminum?
a) 2319 and 4145
b) 4145 and 5356
c) 4043 and 4047
d) 4043 and 5356 - correct answer ✔✔d) 4043 and 5356
