CSA W59 Exam - 160 Questions and Answers Already Graded
A+ Premium Exam Tested And Verified
Subject Area Welding and Structural Steel Fabrication
Description This exam assesses advanced understanding of the CSA W59 standard for welded
steel construction, covering welding processes, qualification, inspection, design,
and metallurgy. It is designed for senior engineering students and practicing
professionals seeking certification.
Expected Grade A+
Total Questions 160
Duration 3 hours
Learning Outcomes 1. Analyze welding procedure specifications (WPS) and procedure qualification
records (PQR) for compliance with CSA W59
2. Evaluate weld discontinuities and determine acceptance criteria based on visual
and NDT methods
3. Design welded connections considering fatigue, fracture toughness, and stress
analysis
4. Interpret preheat and interpass temperature requirements for various steel
grades and thicknesses
Accreditation This exam meets the rigor of top-tier US engineering programs and aligns with
CSA W59-18 standards.
Page 1
,1. A structural engineer specifies a complete joint penetration (CJP) groove weld for
a moment connection in a seismic frame. The base metal is ASTM A992 Gr. 50,
thickness 38 mm, and the welding process is FCAW with a shielding gas. The
contractor proposes to use a backing bar that will remain in place. Which of the
following is the most critical requirement for this weld per CSA W59?
Answer: The backing bar may remain only if it is of the same material as the base
metal and the weld is inspected by ultrasonic testing (UT)
CSA W59 permits leaving a backing bar in place for CJP groove welds only if it is of
the same material as the base metal and the completed weld is inspected by UT (or RT)
to ensure soundness. Option A is incorrect because removal is not mandatory if the bar
is compatible and UT is performed. Options C and D do not align with the standard's
specific requirements for retained backing bars.
2. During a welding procedure qualification test, a 25 mm thick plate (Group II
steel) is welded using GMAW with a short-circuiting transfer mode. The test coupon
passes all mechanical tests except the guided bend test, which reveals a crack
exceeding 3 mm in the weld metal. The engineer argues that short-circuiting transfer
is inherently prone to lack of fusion and should be avoided. Which of the following is
the most accurate interpretation per CSA W59?
Answer: Investigate and revise WPS if lack of fusion
The bend test crack >3 mm is unacceptable per CSA W59. However, the root cause
must be determined. If it is due to lack of fusion (common in short-circuiting GMAW
for thick plates), the WPS must be revised to ensure proper fusion, possibly by
changing transfer mode or parameters. Simply rejecting the procedure or mandating a
different process without investigation is not justified. Edge cracks less than 6 mm are
acceptable only if not associated with lack of fusion, but the problem does not specify
location. Additional bend tests are not a substitute for correcting the underlying issue.
Page 2
,3. A welded assembly made of 12 mm thick CSA G40.21 350W steel is subjected to
cyclic loading. The design life requires 2 million cycles with a stress range of 100
MPa at the weld toe. Which detail category should be used for the fatigue design of a
transverse fillet-welded attachment according to CSA W59?
Answer: Category D (fatigue strength constant amplitude threshold 48 MPa)
Per CSA W59 fatigue design provisions, a transverse fillet-welded attachment
(load-carrying fillet weld) is classified as Detail Category D. The constant amplitude
fatigue threshold (CAFT) for Category D is 48 MPa at 2 million cycles. Category C is
for welded joints with better profiles (e.g., ground flush), while Categories E and F are
for less favorable details such as longitudinal attachments or base metal with severe
stress concentrations.
4. A 50 mm thick ASTM A514 (quenched and tempered) steel plate is to be welded to
a 25 mm thick ASTM A36 plate. The WPS specifies a preheat and interpass
temperature of 150°C. The welding engineer is concerned about hydrogen-induced
cracking. Which of the following additional measures is most critical to prevent cold
cracking in this joint?
Answer: Use a low-hydrogen electrode (e.g., E7018) and bake it according to
manufacturer's recommendations
For quenched and tempered steels like A514, controlling hydrogen is paramount. Using
properly baked low-hydrogen electrodes is the most critical measure. Preheat of 150°C
is already adequate per CSA W59 for the thickness and grade (Table 5.2). PWHT is
generally not required for A514 unless specified, and may reduce strength. Buttering
with stainless steel is not standard practice and introduces other issues.
5. During visual inspection of a complete joint penetration groove weld on a 20 mm
thick plate, the inspector notes a surface crack in the weld metal that is 5 mm long
and 0.5 mm deep. The weld is part of a statically loaded structure in a controlled
environment. According to CSA W59, what is the disposition of this indication?
Answer: Reject because any crack is unacceptable regardless of size
CSA W59 explicitly states that any crack, regardless of size or location, is unacceptable
in welded joints. Cracks are considered critical discontinuities that propagate under
service loads. Options B and C are incorrect because no size or orientation tolerance
applies to cracks. Option D is incorrect because the indication is described as a crack,
not a pore.
Page 3
, 6. A contractor is welding a built-up girder using submerged arc welding (SAW) with
multiple passes. The WPS specifies a welding current of 600 A, voltage 30 V, and
travel speed 40 cm/min. The engineer wants to ensure the heat input does not exceed
3.0 kJ/mm to maintain toughness in the heat-affected zone (HAZ). What is the actual
heat input, and does it comply?
Answer: 2.7 kJ/mm, complies
Heat input = (current × voltage × 60) / (travel speed × 1000) = (600 × 30 × 60) / (40 ×
1000) = 1,080,,000 = 27 kJ/cm = 2.7 kJ/mm. Since 2.7 < 3.0, it complies. Options
B, C, and D result from calculation errors (e.g., using wrong units or misplacing
decimal).
7. In a welding procedure qualification for a 10 mm thick fillet weld on a T-joint, the
test specimen must meet which of the following requirements per CSA W59?
Answer: The weld must be sectioned, polished, and etched for macroetch
examination to reveal weld profile and fusion
CSA W59 requires that fillet weld qualification test specimens be sectioned, polished,
and etched to evaluate weld profile, leg lengths, throat thickness, and fusion to the root.
Option A is incorrect because convexity limits are specified but not a minimum of 1
mm. Option B is not mandatory for qualification; visual and macroetch are primary.
Option C applies to groove welds, not fillet welds.
Page 4
A+ Premium Exam Tested And Verified
Subject Area Welding and Structural Steel Fabrication
Description This exam assesses advanced understanding of the CSA W59 standard for welded
steel construction, covering welding processes, qualification, inspection, design,
and metallurgy. It is designed for senior engineering students and practicing
professionals seeking certification.
Expected Grade A+
Total Questions 160
Duration 3 hours
Learning Outcomes 1. Analyze welding procedure specifications (WPS) and procedure qualification
records (PQR) for compliance with CSA W59
2. Evaluate weld discontinuities and determine acceptance criteria based on visual
and NDT methods
3. Design welded connections considering fatigue, fracture toughness, and stress
analysis
4. Interpret preheat and interpass temperature requirements for various steel
grades and thicknesses
Accreditation This exam meets the rigor of top-tier US engineering programs and aligns with
CSA W59-18 standards.
Page 1
,1. A structural engineer specifies a complete joint penetration (CJP) groove weld for
a moment connection in a seismic frame. The base metal is ASTM A992 Gr. 50,
thickness 38 mm, and the welding process is FCAW with a shielding gas. The
contractor proposes to use a backing bar that will remain in place. Which of the
following is the most critical requirement for this weld per CSA W59?
Answer: The backing bar may remain only if it is of the same material as the base
metal and the weld is inspected by ultrasonic testing (UT)
CSA W59 permits leaving a backing bar in place for CJP groove welds only if it is of
the same material as the base metal and the completed weld is inspected by UT (or RT)
to ensure soundness. Option A is incorrect because removal is not mandatory if the bar
is compatible and UT is performed. Options C and D do not align with the standard's
specific requirements for retained backing bars.
2. During a welding procedure qualification test, a 25 mm thick plate (Group II
steel) is welded using GMAW with a short-circuiting transfer mode. The test coupon
passes all mechanical tests except the guided bend test, which reveals a crack
exceeding 3 mm in the weld metal. The engineer argues that short-circuiting transfer
is inherently prone to lack of fusion and should be avoided. Which of the following is
the most accurate interpretation per CSA W59?
Answer: Investigate and revise WPS if lack of fusion
The bend test crack >3 mm is unacceptable per CSA W59. However, the root cause
must be determined. If it is due to lack of fusion (common in short-circuiting GMAW
for thick plates), the WPS must be revised to ensure proper fusion, possibly by
changing transfer mode or parameters. Simply rejecting the procedure or mandating a
different process without investigation is not justified. Edge cracks less than 6 mm are
acceptable only if not associated with lack of fusion, but the problem does not specify
location. Additional bend tests are not a substitute for correcting the underlying issue.
Page 2
,3. A welded assembly made of 12 mm thick CSA G40.21 350W steel is subjected to
cyclic loading. The design life requires 2 million cycles with a stress range of 100
MPa at the weld toe. Which detail category should be used for the fatigue design of a
transverse fillet-welded attachment according to CSA W59?
Answer: Category D (fatigue strength constant amplitude threshold 48 MPa)
Per CSA W59 fatigue design provisions, a transverse fillet-welded attachment
(load-carrying fillet weld) is classified as Detail Category D. The constant amplitude
fatigue threshold (CAFT) for Category D is 48 MPa at 2 million cycles. Category C is
for welded joints with better profiles (e.g., ground flush), while Categories E and F are
for less favorable details such as longitudinal attachments or base metal with severe
stress concentrations.
4. A 50 mm thick ASTM A514 (quenched and tempered) steel plate is to be welded to
a 25 mm thick ASTM A36 plate. The WPS specifies a preheat and interpass
temperature of 150°C. The welding engineer is concerned about hydrogen-induced
cracking. Which of the following additional measures is most critical to prevent cold
cracking in this joint?
Answer: Use a low-hydrogen electrode (e.g., E7018) and bake it according to
manufacturer's recommendations
For quenched and tempered steels like A514, controlling hydrogen is paramount. Using
properly baked low-hydrogen electrodes is the most critical measure. Preheat of 150°C
is already adequate per CSA W59 for the thickness and grade (Table 5.2). PWHT is
generally not required for A514 unless specified, and may reduce strength. Buttering
with stainless steel is not standard practice and introduces other issues.
5. During visual inspection of a complete joint penetration groove weld on a 20 mm
thick plate, the inspector notes a surface crack in the weld metal that is 5 mm long
and 0.5 mm deep. The weld is part of a statically loaded structure in a controlled
environment. According to CSA W59, what is the disposition of this indication?
Answer: Reject because any crack is unacceptable regardless of size
CSA W59 explicitly states that any crack, regardless of size or location, is unacceptable
in welded joints. Cracks are considered critical discontinuities that propagate under
service loads. Options B and C are incorrect because no size or orientation tolerance
applies to cracks. Option D is incorrect because the indication is described as a crack,
not a pore.
Page 3
, 6. A contractor is welding a built-up girder using submerged arc welding (SAW) with
multiple passes. The WPS specifies a welding current of 600 A, voltage 30 V, and
travel speed 40 cm/min. The engineer wants to ensure the heat input does not exceed
3.0 kJ/mm to maintain toughness in the heat-affected zone (HAZ). What is the actual
heat input, and does it comply?
Answer: 2.7 kJ/mm, complies
Heat input = (current × voltage × 60) / (travel speed × 1000) = (600 × 30 × 60) / (40 ×
1000) = 1,080,,000 = 27 kJ/cm = 2.7 kJ/mm. Since 2.7 < 3.0, it complies. Options
B, C, and D result from calculation errors (e.g., using wrong units or misplacing
decimal).
7. In a welding procedure qualification for a 10 mm thick fillet weld on a T-joint, the
test specimen must meet which of the following requirements per CSA W59?
Answer: The weld must be sectioned, polished, and etched for macroetch
examination to reveal weld profile and fusion
CSA W59 requires that fillet weld qualification test specimens be sectioned, polished,
and etched to evaluate weld profile, leg lengths, throat thickness, and fusion to the root.
Option A is incorrect because convexity limits are specified but not a minimum of 1
mm. Option B is not mandatory for qualification; visual and macroetch are primary.
Option C applies to groove welds, not fillet welds.
Page 4
