CWB WELDING INSPECTOR LEVEL 3 EXAM - COMPLETE QUESTIONS AND DETAILED
SOLUTIONS LATEST UPDATE THIS YEAR JUST RELEASED
Question 1: What is the principle alloying addition for 3XXX series?
Answer:
Manganese .. it imparts greater strength to Al while maintaining excellent
ductility or foamability
Question 2: What is the application for AA3304 and AA3014 ?
Answer:
Best used for beverage cans
Question 3: Where is AA 4XXX series used for ?
Answer:
For welding and brazing filler alloys
Question 4: What is the principle alloying addition for 4XXX series?
Answer:
Silicon, lowers the melting point of the alloys making them suitable for
brazing
Question 5: 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
Question 6: What is the principle alloying addition for 6XXX series?
Answer:
,Mg and Si
Question 7: 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
Question 8: 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
Question 9: 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
Question 10: What does the last 2 digits of AA 1050 indicates?
Answer:
99.50 % min Al
Question 11: What does the last 2 digits of AA 1065 indicates?
Answer:
99.65 % min Al
Question 12: Which are the non-heat treatable alloys?
,Answer:
1XXX,3XXX,4XXX & 5XXX
Question 13: How does the non-heat treatable alloys reach full
potential of their strength?
Answer:
By work hardening. (cold rolling or drawing)
Question 14: 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
Question 15: 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.
Question 16: How does the letter "H" specification (1st digit) of
work hardening/ tempering applies to the non-heat treatable 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
Question 17: 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
Question 18: Materials having the F temper should not be used for
structural welding
Answer:
True
Question 19: What is the annealing temp for 1XXX & 5XXX series ?
Answer:
345 C
Question 20: What are the thermal processes which increase the
strength of heat-treatable alloys?
Answer:
Solution heat treatment and aging
Question 21: What is the aging temp and solution treatment emp
for 2024 ?
Answer:
aging temp = 160 C
solution treatment temp = 500 C
Question 22: What is the aging temp and solution treatment emp
for 6061 ?
SOLUTIONS LATEST UPDATE THIS YEAR JUST RELEASED
Question 1: What is the principle alloying addition for 3XXX series?
Answer:
Manganese .. it imparts greater strength to Al while maintaining excellent
ductility or foamability
Question 2: What is the application for AA3304 and AA3014 ?
Answer:
Best used for beverage cans
Question 3: Where is AA 4XXX series used for ?
Answer:
For welding and brazing filler alloys
Question 4: What is the principle alloying addition for 4XXX series?
Answer:
Silicon, lowers the melting point of the alloys making them suitable for
brazing
Question 5: 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
Question 6: What is the principle alloying addition for 6XXX series?
Answer:
,Mg and Si
Question 7: 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
Question 8: 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
Question 9: 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
Question 10: What does the last 2 digits of AA 1050 indicates?
Answer:
99.50 % min Al
Question 11: What does the last 2 digits of AA 1065 indicates?
Answer:
99.65 % min Al
Question 12: Which are the non-heat treatable alloys?
,Answer:
1XXX,3XXX,4XXX & 5XXX
Question 13: How does the non-heat treatable alloys reach full
potential of their strength?
Answer:
By work hardening. (cold rolling or drawing)
Question 14: 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
Question 15: 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.
Question 16: How does the letter "H" specification (1st digit) of
work hardening/ tempering applies to the non-heat treatable 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
Question 17: 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
Question 18: Materials having the F temper should not be used for
structural welding
Answer:
True
Question 19: What is the annealing temp for 1XXX & 5XXX series ?
Answer:
345 C
Question 20: What are the thermal processes which increase the
strength of heat-treatable alloys?
Answer:
Solution heat treatment and aging
Question 21: What is the aging temp and solution treatment emp
for 2024 ?
Answer:
aging temp = 160 C
solution treatment temp = 500 C
Question 22: What is the aging temp and solution treatment emp
for 6061 ?
