1|Page
API 635 CERTIFICATION EXAM NEWEST 2025/2026 ACTUAL EXAM
WITH COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS
(100% VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED||
Tack welds used in the assembly of vertical joints in tank shells
may remain in place when the joints are welded manually
provided:
a) They are properly cleaned of all weld slag
b) They are sound
c) Liquid Penetrant or Magnetic Particle examination is performed
d) They shall not remain - ANSWER-D
What are the requirements for making tack welds according API-
653?
a) If the tack weld is to be removed, it must be made using
qualified weld procedure and qualified welder
b) If the tack weld is to remain in place, it must be made using
qualified weld procedure and qualified welder
c) If the tack weld is to remain in place, it may be made using any
weld procedure
acceptable to the owner/operator
,2|Page
d) If the tack weld is to be removed, it may be made by any
welder wishing to gain
experience provided the process is the SMAW process -
ANSWER-B
All coatings must be removed from the weld area prior to welding
except weldable primer coatings. What must done if these primer
coatings are used?
a) Weldable primer coatings must also be removed
b) If the coating is applied by brush it may remain provided the
application is performed to a written procedure
c) They shall be included in welding procedure qualification tests
for brand, formulation, and maximum thickness of primer applied
d) They shall be included in welding procedure qualification tests
for the method of application either by brushing or by spraying or
a combination of the two. - ANSWER-C
When welding tank bottoms, when should the shell-to-bottom
weld be completed?
,3|Page
a) This joint (except for door sheets) can be welded as soon as
the bottom plates are laid out and welded
b) This joint (except for door sheets) shall be welded as soon as
the first bottom weld joint is completed to prevent distortion
c) This joint (except for door sheets) shall be welded as work
progresses around the tank bottom
d) This joint (except for door sheets) shall be completed before
the welding of bottom joints - ANSWER-D
What is the maximum permissible misalignment of vertical joints
in shell plates that are .9375" thick?
a) 0.125"
b) 0.09375"
c) 0.009375"
d) 0.0125" - ANSWER-B
What is the maximum permissible misalignment of vertical joints
in shell plates that are .625" thick?
a) 0.0625"
b) 0.00625"
, 4|Page
c) 0.125"
d) 0.0125" - ANSWER-A
Vertical joints shall be completed before the lower horizontal weld
is made.
a) True
b) False - ANSWER-A
In completing horizontal joints, what is the maximum projection of
the upper plate, beyond the face of the lower plate, at any point
for plate thickness of 1.125"
a) 0.25"
b) 0.225"
c) 0.125"
d) 0.0125" - ANSWER-C
When welding horizontal and vertical joints constructed of
material that is over 1.5" thick, based on the thickness of the
thicker part, what is the required preheat temperature?
API 635 CERTIFICATION EXAM NEWEST 2025/2026 ACTUAL EXAM
WITH COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS
(100% VERIFIED ANSWERS) |ALREADY GRADED A+| ||PROFESSOR
VERIFIED||
Tack welds used in the assembly of vertical joints in tank shells
may remain in place when the joints are welded manually
provided:
a) They are properly cleaned of all weld slag
b) They are sound
c) Liquid Penetrant or Magnetic Particle examination is performed
d) They shall not remain - ANSWER-D
What are the requirements for making tack welds according API-
653?
a) If the tack weld is to be removed, it must be made using
qualified weld procedure and qualified welder
b) If the tack weld is to remain in place, it must be made using
qualified weld procedure and qualified welder
c) If the tack weld is to remain in place, it may be made using any
weld procedure
acceptable to the owner/operator
,2|Page
d) If the tack weld is to be removed, it may be made by any
welder wishing to gain
experience provided the process is the SMAW process -
ANSWER-B
All coatings must be removed from the weld area prior to welding
except weldable primer coatings. What must done if these primer
coatings are used?
a) Weldable primer coatings must also be removed
b) If the coating is applied by brush it may remain provided the
application is performed to a written procedure
c) They shall be included in welding procedure qualification tests
for brand, formulation, and maximum thickness of primer applied
d) They shall be included in welding procedure qualification tests
for the method of application either by brushing or by spraying or
a combination of the two. - ANSWER-C
When welding tank bottoms, when should the shell-to-bottom
weld be completed?
,3|Page
a) This joint (except for door sheets) can be welded as soon as
the bottom plates are laid out and welded
b) This joint (except for door sheets) shall be welded as soon as
the first bottom weld joint is completed to prevent distortion
c) This joint (except for door sheets) shall be welded as work
progresses around the tank bottom
d) This joint (except for door sheets) shall be completed before
the welding of bottom joints - ANSWER-D
What is the maximum permissible misalignment of vertical joints
in shell plates that are .9375" thick?
a) 0.125"
b) 0.09375"
c) 0.009375"
d) 0.0125" - ANSWER-B
What is the maximum permissible misalignment of vertical joints
in shell plates that are .625" thick?
a) 0.0625"
b) 0.00625"
, 4|Page
c) 0.125"
d) 0.0125" - ANSWER-A
Vertical joints shall be completed before the lower horizontal weld
is made.
a) True
b) False - ANSWER-A
In completing horizontal joints, what is the maximum projection of
the upper plate, beyond the face of the lower plate, at any point
for plate thickness of 1.125"
a) 0.25"
b) 0.225"
c) 0.125"
d) 0.0125" - ANSWER-C
When welding horizontal and vertical joints constructed of
material that is over 1.5" thick, based on the thickness of the
thicker part, what is the required preheat temperature?
