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CWB WELDING INSPECTOR LEVEL 3 EXAM WITH ACTUAL CORRECT QUESTIONS AND VERIFIED DETAILED ANSWERS |FREQUENTLY TESTED QUESTIONS AND SOLUTIONS |ALREADY GRADED A+|BRAND NEW VERSION!!! |GUARANTEED PASS|LATEST UPDATE$21.49
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CWB WELDING INSPECTOR LEVEL 3 EXAM
2024-2025 WITH ACTUAL CORRECT
QUESTIONS AND VERIFIED DETAILED
ANSWERS |FREQUENTLY TESTED
QUESTIONS AND SOLUTIONS |ALREADY
GRADED A+|BRAND NEW VERSION!!!
|GUARANTEED PASS|LATEST UPDATE
How does the 2nd digit applies to the non-heat treatable alloys ?
> 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
True
What is the annealing temp for 1XXX & 5XXX series ?
345 C
What are the thermal processes which increase the strength of heat-treatable alloys?
Solution heat treatment and aging
What is the aging temp and solution treatment emp for 2024 ?
aging temp = 160 C
solution treatment temp = 500 C
What is the aging temp and solution treatment emp for 6061 ?
1|Page
,aging temp = 175 C
solution treatment temp = 530 C
What is the aging temp and solution treatment emp for 6063 ?
aging temp = 175 C
solution treatment temp = 520 C
What is the annealing temp for 2024,6061 and 6063 ?
415 C
What is the annealing temp for 7005 ?
345 C- 400 C
How is Solution heat-treatment done for heat treatable Al alloys?
by heating the alloy to a temp below the melting point for a specific period of time and rapidly cooling
from this temp.
Eg -For AA-6061, the solution heat treatment temp is 530 C
How is aging done for heat-treatable Al alloys?
relatively low temp heat treatment that results in additional hardening of the solution heat-treated
material.
Eg - For AA6061 it is 170C
The aging process strengthens these alloys by the precipitation of constituents that are too fine to
observe with an optical microscope.
What is the pre requisite for aging?
alloying constituents are in a solid solution as a result of rapid cooling from the solution heat treatment
temp.
What is over-aging?
The precipitated constituents have a stress field around them to accommodate the precipitates in the
solid phase. This accommodation of a solid particle in a solid matrix accounts for the strengthening by
aging.
If aging is conducted for an excessive amount of time, or at an excessive temperature then the
precipitates no longer have the stress field about them and there is a loss of strength. that can range
from little to a great deal. This process is called over-aging
What are naturally aged alloys?
Heat treatable alloys ,such as alloy AA-7005, age at the room temp. These are called naturally aged
alloys.
2|Page
,Does age strengthening of AA-7004 & AA-7005 require rapid cooling/water quenching to retain
constituents in the solid solution?
No
True / False?
Water quenching does not causes distortion of the extrusions
False
How is heat temper designation given for heat treatable alloys?
by the prefix letter "T" followed up by four number.
The first and second numbers indicate the basic sequence of the operations that has been carried out.
What is the major alloying element in cast alloy 1xx.x ?
99.00 % min Al and greater
What is the major alloying element in cast alloy 2xx.x ?
Cu
What is the major alloying element in cast alloy 3xx.x ?
Silicon, with added Cu and/or magneisum
What is the major alloying element in cast alloy 4xx.x ?
Silicon
What is the major alloying element in cast alloy 5xx.x?
Magnesium
What is the major alloying element in cast alloy 7xx.x ?
Zinc
What is the major alloying element in cast alloy 8xx.x ?
Tin
What does the alloy name AA-150.0 indicates?
unalloyed Al casting having Al purity of 99.50%
What does first and second digits in 2xx.x to 9xx.x indicates?
The first digit indicates the Al alloy group. The second two digits only serve to identigy different alloys in
the group.
What does the fourth digit in 2xx.x to 9xx.x indicates?
3|Page
, The fourth digit, which is separated from the first three by a decimal point, identifies the product form,
ie, casting or ingot.
A zero in the fourth place , xxx.o ,refers to the final casting; and a 1 or 2 in the fourth place , xxx.1 or
xxx.2 refers to ingot.
True / False ?
It is highly unlikely that casting would be work-hardened to achieve a final shape. Therefore the "H"
temper designation is not applied to castings.
True
True / False ?
Heat treatments increases the strength ,hardness, toughness and impact resistance of castings. The
same processing terms that applied to the heat-treatable wrought alloys also apply to the heat-treatable
castings
True
How is strengthening done for heat treatable casting alloys?
For max strength, the castings have first to be solution heat treated to place the soluble constituents
into the solution and then the casting has to be cooled rapidly from that elevated temperature.
The cooling techniques include forced air and boiling water immersion. Less severe quenching practices
are followed to minimize distortion.
True / false?
Distortion of castings is a concern during heat treatment of casting Al alloys.
True.
Distortion of castings is a concern during heat treatment of casting Al alloys since distorted parts require
rectification to ensure dimensional compliance to drawings.
Ductility of Al casting is very low in ................... castings
Sand
True / False?
The amount of rectification (ie, cold working) to compensate for distortion has to be minimalized to
avoid fracture that would otherwise occur when the ductility was exceeded.
True
What is the solution heat-treatment temps employed for cast Al alloys?
432 C to 540 C depending upon the alloy
4|Page
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