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CWB WELDING INSPECTOR LEVEL 3 EXAM NEWEST
ACTUAL EXAM COMPLETE 200 QUESTIONS AND
CORRECT DETAILED ANSWERS WITH RATIONALES
(VERIFIED ANSWERS) |ALREADY GRADED
A+||NEWEST VERSION!!!
What is the principle alloying addition for 3XXX series? -
ANSWER-Manganese .. it imparts greater strength to Al
while maintaining excellent ductility or foamability
What is the application for AA3304 and AA3014 ? -
ANSWER-Best used for beverage cans
Where is AA 4XXX series used for ? - ANSWER-For
welding and brazing filler alloys
What is the principle alloying addition for 4XXX series? -
ANSWER-Silicon, lowers the melting point of the alloys
making them suitable for brazing
What is the principle alloying addition for 5XXX series? -
ANSWER-Magnesium... Work hardening alloys... Alloys
with less than 3% Mg have good corrosion resistance
whereas alloys having more than 3% Mg can be
susceptible for exfoliation and stress corrosion
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What is the principle alloying addition for 6XXX series? -
ANSWER-Mg and Si
Where is AA 6XXX series used for ? - ANSWER-
Fabrication of general structures (extrusions welded to the
dump body truck sides as stiffeners) and in rolled form for
automotive outer panels
What is the alloying addition for 7XXX series? - ANSWER-
1. Zinc and Magnesium for high strength
2. Cu is also added for high strength but alloys are
susceptible for stress corrosion cracking. High Cu content
deems the alloy unweldable
What is the application for 7XXX series? - ANSWER-1.
Used for aircraft structures where the product can be clad
to prevent corrosion or the components are continually
inspected for signs of stress corrosion cracking.
2. AA 7004 & AA 7005 are used for welded ground
transportation vehicles
What does the last 2 digits of AA 1050 indicates? -
ANSWER-99.50 % min Al
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What does the last 2 digits of AA 1065 indicates? -
ANSWER-99.65 % min Al
Which are the non-heat treatable alloys? - ANSWER-
1XXX,3XXX,4XXX & 5XXX
How does the non-heat treatable alloys reach full potential
of their strength? - ANSWER-By work hardening. (cold
rolling or drawing)
How is the final temper obtained in the non-heat treatable
alloys ? - ANSWER-Work hardening alone, work
hardening followed by partial annealing or work hardening
followed by stabilizing
What is stabilizing treatment after work hardening of the
non-heat treatable alloys ? - ANSWER-thermal treatment
,at low temperature that may be given to alloys such as
AA-5052 and AA-5454 that otherwise would tend to "age-
soften" after production. The stabilization treatment usually
improves ductility.
How does the letter "H" specification (1st digit) of work
hardening/ tempering applies to the non-heat treatable
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alloys ? - ANSWER-H1 - The material has been work-
hardened
H2 - The material has been work-hardened and partially
annealed
H3 - The material has been work-hardened and Stabilized
How does the 2nd digit applies to the non-heat treatable
alloys ? - ANSWER-> 0-8
> denotes the degree of work hardening.
8 - tempers having a UTS eqv to that achieved by a cold
reduction of approx 75% of the metal from its softest
stage.
0 is Fully annealed - the softest temper
F - As fabricated
True / False
Materials having the F temper should not be used for
structural welding - ANSWER-True
What is the annealing temp for 1XXX & 5XXX series ? -
ANSWER-345 C
CWB WELDING INSPECTOR LEVEL 3 EXAM NEWEST
ACTUAL EXAM COMPLETE 200 QUESTIONS AND
CORRECT DETAILED ANSWERS WITH RATIONALES
(VERIFIED ANSWERS) |ALREADY GRADED
A+||NEWEST VERSION!!!
What is the principle alloying addition for 3XXX series? -
ANSWER-Manganese .. it imparts greater strength to Al
while maintaining excellent ductility or foamability
What is the application for AA3304 and AA3014 ? -
ANSWER-Best used for beverage cans
Where is AA 4XXX series used for ? - ANSWER-For
welding and brazing filler alloys
What is the principle alloying addition for 4XXX series? -
ANSWER-Silicon, lowers the melting point of the alloys
making them suitable for brazing
What is the principle alloying addition for 5XXX series? -
ANSWER-Magnesium... Work hardening alloys... Alloys
with less than 3% Mg have good corrosion resistance
whereas alloys having more than 3% Mg can be
susceptible for exfoliation and stress corrosion
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What is the principle alloying addition for 6XXX series? -
ANSWER-Mg and Si
Where is AA 6XXX series used for ? - ANSWER-
Fabrication of general structures (extrusions welded to the
dump body truck sides as stiffeners) and in rolled form for
automotive outer panels
What is the alloying addition for 7XXX series? - ANSWER-
1. Zinc and Magnesium for high strength
2. Cu is also added for high strength but alloys are
susceptible for stress corrosion cracking. High Cu content
deems the alloy unweldable
What is the application for 7XXX series? - ANSWER-1.
Used for aircraft structures where the product can be clad
to prevent corrosion or the components are continually
inspected for signs of stress corrosion cracking.
2. AA 7004 & AA 7005 are used for welded ground
transportation vehicles
What does the last 2 digits of AA 1050 indicates? -
ANSWER-99.50 % min Al
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What does the last 2 digits of AA 1065 indicates? -
ANSWER-99.65 % min Al
Which are the non-heat treatable alloys? - ANSWER-
1XXX,3XXX,4XXX & 5XXX
How does the non-heat treatable alloys reach full potential
of their strength? - ANSWER-By work hardening. (cold
rolling or drawing)
How is the final temper obtained in the non-heat treatable
alloys ? - ANSWER-Work hardening alone, work
hardening followed by partial annealing or work hardening
followed by stabilizing
What is stabilizing treatment after work hardening of the
non-heat treatable alloys ? - ANSWER-thermal treatment
,at low temperature that may be given to alloys such as
AA-5052 and AA-5454 that otherwise would tend to "age-
soften" after production. The stabilization treatment usually
improves ductility.
How does the letter "H" specification (1st digit) of work
hardening/ tempering applies to the non-heat treatable
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alloys ? - ANSWER-H1 - The material has been work-
hardened
H2 - The material has been work-hardened and partially
annealed
H3 - The material has been work-hardened and Stabilized
How does the 2nd digit applies to the non-heat treatable
alloys ? - ANSWER-> 0-8
> denotes the degree of work hardening.
8 - tempers having a UTS eqv to that achieved by a cold
reduction of approx 75% of the metal from its softest
stage.
0 is Fully annealed - the softest temper
F - As fabricated
True / False
Materials having the F temper should not be used for
structural welding - ANSWER-True
What is the annealing temp for 1XXX & 5XXX series ? -
ANSWER-345 C
