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CWB WELDING INSPECTOR LEVEL III STUDY
GUIDE 2025| BRAND NEW ACTUAL EXAM WITH
100% VERIFIED QUESTIONS AND CORRECT
SOLUTIONS| GUARANTEED VALUE PACK| ACE
YOUR GRADES.
1. Which of the following elements are most likely to form interstitial solid
solutions?
(a) copper
(b) nickel
(c) carbon - correct answer - (c)
2. If FCC iron has a denser structure than BCC iron, why does it have a
higher solubility for carbon? - correct answer - The preferred site for
carbon in BCC iron is smaller than that in FCC iron.
3. If two metals have complete mutual solid solubility how many phases
are formed in the solid- one or two? - correct answer - One
4. How many phases are there in a eutectic- one or two? - correct answer -
Two
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5. Without referring to the text, draw the phase diagram for a eutectic
system with limited mutual solid solubility of the two components. -
correct answer - Refer to Figure 6.6(Module 20-2014, page 18)
6. Using the portion of the iron-carbon phase diagram in Figure
6.10(Module 20-2014, page 21), use the lever rule to determine the
precentage of ferrite and eutectoid pearlite present in a slowly cooled
0.2% carbon steel. - correct answer - About 25% pearlite and 75%
ferrite. Here the tie line begins at 0.0%C (α ferrite) and ends at 0.08%C
(pearlite).
The fulcrum for the lever rule is at 0.2%C
% pearlite = (0.2%C - 0.0%C)/).8%C - 0.0%C) x 100%
% pearlite = (0.2/0.8) x 100%
% pearlite = 25%
7. Which of the following metals has the highest work hardening
coefficient?
(a) 70/30 brass
(b) aluminum
(c) copper
(d) low carbon steel - correct answer - (a)
8. True or False?
Recrystallization always involves the formation of a new phase. - correct
answer - False
CWB WELDING INSPECTOR LEVEL III STUDY
GUIDE 2025| BRAND NEW ACTUAL EXAM WITH
100% VERIFIED QUESTIONS AND CORRECT
SOLUTIONS| GUARANTEED VALUE PACK| ACE
YOUR GRADES.
1. Which of the following elements are most likely to form interstitial solid
solutions?
(a) copper
(b) nickel
(c) carbon - correct answer - (c)
2. If FCC iron has a denser structure than BCC iron, why does it have a
higher solubility for carbon? - correct answer - The preferred site for
carbon in BCC iron is smaller than that in FCC iron.
3. If two metals have complete mutual solid solubility how many phases
are formed in the solid- one or two? - correct answer - One
4. How many phases are there in a eutectic- one or two? - correct answer -
Two
, Page |2
5. Without referring to the text, draw the phase diagram for a eutectic
system with limited mutual solid solubility of the two components. -
correct answer - Refer to Figure 6.6(Module 20-2014, page 18)
6. Using the portion of the iron-carbon phase diagram in Figure
6.10(Module 20-2014, page 21), use the lever rule to determine the
precentage of ferrite and eutectoid pearlite present in a slowly cooled
0.2% carbon steel. - correct answer - About 25% pearlite and 75%
ferrite. Here the tie line begins at 0.0%C (α ferrite) and ends at 0.08%C
(pearlite).
The fulcrum for the lever rule is at 0.2%C
% pearlite = (0.2%C - 0.0%C)/).8%C - 0.0%C) x 100%
% pearlite = (0.2/0.8) x 100%
% pearlite = 25%
7. Which of the following metals has the highest work hardening
coefficient?
(a) 70/30 brass
(b) aluminum
(c) copper
(d) low carbon steel - correct answer - (a)
8. True or False?
Recrystallization always involves the formation of a new phase. - correct
answer - False
