AWS-CWI Part- C AWS D1.1 Questions Answers

Below are 50 multiple-choice questions each for API 1104 (Standard for Welding of Pipelines and Related Facilities) and AWS D1.1 (Structural Welding Code – Steel) designed for the AWS-CWI (Certified Welding Inspector) exam, Part C (Code Book). These questions simulate the open-book portion, where candidates must locate answers in the respective code within a time limit. Each question includes the correct answer and a brief explanation referencing the relevant section of the code to aid preparation. The questions cover key areas like weld imperfections, welder qualifications, inspection requirements, and welding procedures.

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API 1104 Questions (50 Questions)

Note: These questions are based on API 1104, 21st Edition, as commonly used for the CWI exam. Always verify the edition required for your test.

What is the maximum allowable length of a single slag inclusion in a 12-inch diameter pipe weld per API 1104?
A) 1/8 inch
B) 1/4 inch
C) 2 inches
D) 3 inches
Answer: C
Explanation: API 1104, Section 9.3.8.1, states that the maximum length of a single slag inclusion shall not exceed 2 inches for any weld.
Per API 1104, what is the minimum required tensile strength for a weld in a destructive test?
A) Equal to the specified minimum tensile strength of the pipe
B) 90% of the pipe’s yield strength
C) 95% of the pipe’s tensile strength
D) Equal to the pipe’s yield strength
Answer: A
Explanation: Section 5.6.2.1 requires that the tensile strength of the weld in a destructive test be at least equal to the specified minimum tensile strength of the pipe material.
What is the maximum allowable depth of undercut for a pipeline weld per API 1104?
A) 0.031 inch
B) 0.062 inch
C) 0.125 inch
D) 0.25 inch
Answer: A
Explanation: Section 9.3.11 specifies that undercut depth shall not exceed 0.031 inch (1/32 inch) for pipeline welds.
How often must a welder requalify per API 1104 if they have not welded with a qualified procedure for 6 months?
A) Immediately
B) Within 1 month
C) Within 3 months
D) No requalification needed
Answer: A
Explanation: Section 6.2.2 requires a welder to requalify if they have not used the welding process for 6 months or more.
What is the maximum acceptable crack length in a pipeline weld per API 1104?
A) 1/8 inch
B) 1/4 inch
C) 1/2 inch
D) None allowed
Answer: D
Explanation: Section 9.3.1 states that cracks are not permitted in pipeline welds, except for crater cracks under specific conditions.
Per API 1104, what is the minimum number of specimens required for a nick-break test in welder qualification?
A) 1
B) 2
C) 3
D) 4
Answer: B
Explanation: Section 6.5.2 requires two nick-break specimens for welder qualification testing.
What is the maximum allowable porosity diameter for a single pore in a radiograph per API 1104?
A) 1/8 inch
B) 1/4 inch
C) 1/2 inch
D) 1 inch
Answer: A
Explanation: Section 9.3.9.2 limits the diameter of any single pore to 1/8 inch or 25% of the wall thickness, whichever is smaller.
Per API 1104, what is the minimum preheat temperature for welding carbon steel with a wall thickness over 1 inch?
A) 100°F
B) 150°F
C) 200°F
D) 250°F
Answer: C
Explanation: Section 7.8 recommends a minimum preheat of 200°F for carbon steel with a wall thickness greater than 1 inch, unless otherwise specified.
What is the required visual inspection frequency for pipeline welds per API 1104?
A) Only after welding
B) Before and after welding
C) Before, during, and after welding
D) Once per shift
Answer: C
Explanation: Section 8.1 requires visual inspection before, during, and after welding to ensure quality at all stages.
Per API 1104, what is the maximum allowable incomplete penetration length in a weld?
A) 1 inch
B) 2 inches
C) 3 inches
D) 4 inches
Answer: B
Explanation: Section 9.3.2 limits incomplete penetration to a total length of 2 inches in any 12-inch weld length.
What is the minimum length of a welder qualification test weld per API 1104?
A) 6 inches
B) 8 inches
C) 10 inches
D) 12 inches
Answer: A
Explanation: Section 6.3.1 requires a minimum test weld length of 6 inches for pipe or a full circumference for small-diameter pipe.
Per API 1104, what is the maximum allowable burn-through area in a radiograph?
A) 1/4 inch
B) 1/2 inch
C) 1 inch
D) None allowed
Answer: B
Explanation: Section 9.3.5 limits burn-through to a maximum dimension of 1/2 inch and only one per 12-inch weld length.
What is the acceptance criterion for cluster porosity per API 1104?
A) Total area not to exceed 1/2 square inch
B) Total area not to exceed 1 square inch
C) Total diameter not to exceed 1/2 inch
D) No cluster porosity allowed
Answer: C
Explanation: Section 9.3.9.3 states that cluster porosity shall not exceed a total diameter of 1/2 inch in any 4-inch weld length.
Per API 1104, who is responsible for approving a welding procedure specification (WPS)?
A) The welder
B) The inspector
C) The company
D) The engineer
Answer: C
Explanation: Section 5.3.1 states that the company (employer or contractor) is responsible for approving the WPS.
What is the maximum allowable arc burn length adjacent to a weld per API 1104?
A) 1/8 inch
B) 1/4 inch
C) 1/2 inch
D) None allowed
Answer: D
Explanation: Section 9.3.12 prohibits arc burns (arc strikes) adjacent to the weld due to their potential to initiate cracks.
Per API 1104, what is the required storage condition for low-hydrogen electrodes?
A) Store at room temperature
B) Keep in a heated oven at 250°F
C) Store in a sealed container
D) No special requirements
Answer: B
Explanation: Section 7.4.3 requires low-hydrogen electrodes to be stored in an oven at 250°F or higher to prevent moisture absorption.
What is the maximum allowable mismatch (high-low) for pipe ends per API 1104?
A) 1/16 inch
B) 1/8 inch
C) 1/4 inch
D) 1/2 inch
Answer: B
Explanation: Section 7.2 limits mismatch to 1/8 inch unless otherwise specified by the company.
Per API 1104, what is the minimum number of radiographs required for a 12-inch diameter pipe weld?
A) 1
B) 2
C) 3
D) Full circumference
Answer: D
Explanation: Section 11.1.4 requires radiographic testing to cover 100% of the weld circumference for acceptance.
What is the maximum allowable incomplete fusion length per API 1104?
A) 1 inch
B) 2 inches
C) 3 inches
D) 4 inches
Answer: B
Explanation: Section 9.3.3 limits incomplete fusion to a total length of 2 inches in any 12-inch weld length.
Per API 1104, what is the required bend angle for a face or root bend test?
A) 90 degrees
B) 180 degrees
C) 270 degrees
D) 360 degrees
Answer: B
Explanation: Section 5.6.3.2 specifies that face and root bend specimens must be bent 180 degrees for qualification testing.
What is the maximum allowable reinforcement height for a pipeline weld per API 1104?
A) 1/16 inch
B) 1/8 inch
C) 1/4 inch
D) 1/2 inch
Answer: B
Explanation: Section 7.10 limits weld reinforcement to 1/8 inch for pipe welds.
Per API 1104, what is the minimum distance between two adjacent welds on a pipeline?
A) 1 inch
B) 2 inches
C) 3 inches
D) No minimum specified
Answer: D
Explanation: Section 7 does not specify a minimum distance between adjacent welds, leaving it to company discretion.
What is the acceptance criterion for a nick-break test per API 1104?
A) No defects allowed
B) Imperfections less than 1/4 inch total
C) Imperfections less than 1/8 inch total
D) Imperfections less than 1/2 inch total
Answer: B
Explanation: Section 6.5.3 allows imperfections in nick-break tests to total less than 1/4 inch in any specimen.
Per API 1104, what is the minimum required visual acuity for a welding inspector?
A) 20/20
B) 20/30
C) 20/40
D) 20/50
Answer: C
Explanation: Section 8.5 requires inspectors to have 20/40 vision or better, with or without correction.
What is the maximum allowable cumulative length of porosity in a 12-inch weld per API 1104?
A) 1 inch
B) 2 inches
C) 3 inches
D) 4 inches
Answer: A
Explanation: Section 9.3.9.1 limits the cumulative length of porosity to 1 inch in any 12-inch weld length.
Per API 1104, what is the required storage condition for cellulosic electrodes?
A) Store in a heated oven
B) Keep dry in sealed containers
C) Submerge in water
D) No special requirements
Answer: B
Explanation: Section 7.4.2 requires cellulosic electrodes to be kept dry in sealed containers to prevent moisture damage.
What is the maximum allowable wall thickness variation for pipe ends per API 1104?
A) 1/16 inch
B) 1/8 inch
C) 1/4 inch
D) 1/2 inch
Answer: B
Explanation: Section 7.2 limits wall thickness variation to 1/8 inch for proper alignment and welding.
Per API 1104, what is the required NDT method for welds in high-pressure pipelines?
A) Visual Testing only
B) Radiographic Testing
C) Magnetic Particle Testing
D) Liquid Penetrant Testing
Answer: B
Explanation: Section 11.1 specifies radiographic testing as the primary NDT method for welds in high-pressure pipelines.
What is the maximum allowable slag inclusion width per API 1104?
A) 1/16 inch
B) 1/8 inch
C) 1/4 inch
D) 1/2 inch
Answer: A
Explanation: Section 9.3.8.2 limits slag inclusion width to 1/16 inch or the wall thickness, whichever is smaller.
Per API 1104, what is the required interpass temperature for welding?
A) Below 500°F
B) Above 200°F
C) As specified in the WPS
D) No limit specified
Answer: C
Explanation: Section 7.8 states that interpass temperature must follow the WPS requirements.
What is the maximum allowable defect repair length in a single weld per API 1104?
A) 8 inches
B) 10 inches
C) 12 inches
D) No limit specified
Answer: D
Explanation: Section 10.2 does not specify a maximum repair length, but repairs must meet acceptance criteria.
Per API 1104, what is the minimum number of side-bend tests for pipe over 4 inches in diameter?
A) 2
B) 4
C) 6
D) 8
Answer: B
Explanation: Section 5.6.3.1 requires four side-bend tests for procedure qualification on pipe over 4 inches in diameter.
What is the maximum allowable reinforcement width for a pipeline weld per API 1104?
A) 1/8 inch
B) 1/4 inch
C) 1/2 inch
D) Not specified
Answer: D
Explanation: Section 7.10 does not specify a maximum reinforcement width, only height (1/8 inch).
Per API 1104, what is the required frequency of procedure qualification testing?
A) Every job
B) Every year
C) When essential variables change
D) Every 5 years
Answer: C
Explanation: Section 5.4 requires requalification when essential variables (e.g., process, filler metal) change.
What is the maximum allowable incomplete penetration depth per API 1104?
A) 1/32 inch
B) 1/16 inch
C) 1/8 inch
D) Not specified
Answer: D
Explanation: Section 9.3.2 specifies length (2 inches) but not depth for incomplete penetration; acceptance is based on radiograph evaluation.
Per API 1104, what is the required documentation for a WPS?
A) Welder’s name
B) Essential variables
C) Inspector’s signature
D) Pipe diameter only
Answer: B
Explanation: Section 5.3.2 requires the WPS to document essential variables like welding process and filler metal.
What is the maximum allowable number of burn-throughs in a 12-inch weld per API 1104?
A) 1
B) 2
C) 3
D) None allowed
Answer: A
Explanation: Section 9.3.5 allows one burn-through up to 1/2 inch per 12-inch weld length.
Per API 1104, what is the required cooling rate for welds?
A) As specified in the WPS
B) Below 100°F per minute
C) Above 200°F per minute
D) No limit specified
Answer: A
Explanation: Section 7.8 states that cooling rates must follow the WPS to control weld properties.
What is the maximum allowable porosity spacing per API 1104?
A) 1 inch apart
B) 2 inches apart
C) No limit specified
D) 1/2 inch apart
Answer: C
Explanation: Section 9.3.9 does not specify porosity spacing, only size and cumulative length.
Per API 1104, what is the required electrode diameter range for welder qualification?
A) As specified in the WPS
B) 1/8 inch only
C) 5/32 inch or less
D) No limit specified
Answer: A
Explanation: Section 6.3 requires welders to qualify using electrodes specified in the WPS.
What is the maximum allowable slag inclusion length in a radiograph per API 1104?
A) 1 inch
B) 2 inches
C) 3 inches
D) 4 inches
Answer: B
Explanation: Section 9.3.8.1 limits slag inclusion length to 2 inches in any weld.
Per API 1104, what is the required welder qualification position for pipe welding?
A) Flat only
B) As specified in the WPS
C) Fixed position (5G or 6G)
D) Vertical only
Answer: B
Explanation: Section 6.3 allows welder qualification in positions specified by the WPS, such as 5G or 6G for pipeline welding.
What is the maximum allowable defect size in a repair weld per API 1104?
A) Same as original weld
B) 1/2 the original weld
C) 1/4 the original weld
D) No defects allowed
Answer: A
Explanation: Section 10.2 requires repair welds to meet the same acceptance criteria as the original weld.
Per API 1104, what is the required inspection method for welder qualification welds?
A) Visual only
B) Radiographic or destructive testing
C) Ultrasonic testing
D) Liquid penetrant testing
Answer: B
Explanation: Section 6.4 allows radiographic or destructive testing (e.g., bend or nick-break tests) for welder qualification welds.
What is the maximum allowable undercut length per API 1104?
A) 2 inches
B) 3 inches
C) 4 inches
D) No limit specified
Answer: A
Explanation: Section 9.3.11 limits undercut to a cumulative length of 2 inches in any 12-inch weld length.
Per API 1104, what is the required base metal preparation before welding?
A) Clean and free of defects
B) Painted for protection
C) Preheated to 500°F
D) No preparation needed
Answer: A
Explanation: Section 7.1 requires base metal to be clean and free of defects like laminations or cracks.
What is the maximum allowable incomplete fusion depth per API 1104?
A) 1/32 inch
B) 1/16 inch
C) 1/8 inch
D) Not specified
Answer: D
Explanation: Section 9.3.3 specifies length (2 inches) but not depth; acceptance is based on radiograph evaluation.
Per API 1104, what is the required storage time for low-hydrogen electrodes after oven drying?
A) 4 hours
B) 8 hours
C) 12 hours
D) No limit specified
Answer: A
Explanation: Section 7.4.3 allows low-hydrogen electrodes to be used within 4 hours of removal from the oven if not re-dried.
What is the maximum allowable number of repairs on a single weld per API 1104?
A) 1
B) 2
C) 3
D) No limit specified
Answer: D
Explanation: Section 10.2 does not limit the number of repairs, provided they meet acceptance criteria.
Per API 1104, what is the required qualification for a welding inspector?
A) AWS-CWI certification
B) Company approval
C) API certification
D) No qualification specified
Answer: B
Explanation: Section 8.5 requires inspectors to be approved by the company, with no specific certification mandated.

AWS D1.1 Questions (50 Questions)

Note: These questions are based on AWS D1.1/D1.1M:2020, as commonly used for the CWI exam. Verify the edition for your test.

Per AWS D1.1, what is the maximum allowable depth of undercut for statically loaded structures?
A) 0.5 mm
B) 1.0 mm
C) 1.5 mm
D) 2.0 mm
Answer: B
Explanation: Clause 6.26.2.2 allows undercut up to 1 mm deep for statically loaded structures.
What is the minimum preheat temperature for welding 50 mm thick A36 steel per AWS D1.1?
A) 10°C
B) 66°C
C) 107°C
D) 150°C
Answer: B
Explanation: Table 4.4 requires a minimum preheat of 66°C for A36 steel with a thickness of 25–65 mm.
Per AWS D1.1, what is the maximum allowable single pore diameter in a fillet weld?
A) 1 mm
B) 2 mm
C) 3 mm
D) 4 mm
Answer: B
Explanation: Table 6.1, Note b, limits single pore diameter to 2 mm or 1/3 of the weld size, whichever is smaller.
What is required if a welder fails a qualification test per AWS D1.1?
A) Immediate retest
B) Training followed by retest
C) Permanent disqualification
D) Engineer approval to continue
Answer: B
Explanation: Clause 4.20.3 requires additional training before retesting a welder who fails.
Per AWS D1.1, what is the maximum allowable crack length in a weld?
A) 1 mm
B) 2 mm
C) 3 mm
D) None allowed
Answer: D
Explanation: Table 6.1 prohibits all cracks in welds due to their potential to propagate.
What is the maximum allowable weld reinforcement for a butt weld per AWS D1.1?
A) 1 mm
B) 3 mm
C) 5 mm
D) 7 mm
Answer: B
Explanation: Table 6.1 limits butt weld reinforcement to 3 mm for thicknesses up to 25 mm.
Per AWS D1.1, what is the required visual inspection frequency for welds?
A) Before welding only
B) After welding only
C) Before, during, and after welding
D) Once per shift
Answer: C
Explanation: Clause 6.9 requires visual inspection at all stages to ensure quality.
What is the acceptance criterion for fillet weld convexity per AWS D1.1?
A) Convexity must not exceed 2 mm
B) Convexity must not exceed 0.1 times weld size + 3 mm
C) No convexity allowed
D) Convexity is unlimited
Answer: B
Explanation: Table 6.1 limits convexity to 0.1 times the weld size plus 3 mm.
Per AWS D1.1, what is the minimum length of a welder qualification test weld for plate?
A) 100 mm
B) 150 mm
C) 200 mm
D) 300 mm
Answer: B
Explanation: Clause 4.22.1.2 requires a minimum test weld length of 150 mm for plate.
What is the required storage condition for low-hydrogen electrodes per AWS D1.1?
A) Store at room temperature
B) Keep in a heated oven at 120°C
C) Store in open air
D) Submerge in water
Answer: B
Explanation: Clause 5.3.2.2 requires low-hydrogen electrodes to be stored at 120°C or higher.
Per AWS D1.1, what is the maximum allowable mismatch for a butt joint?
A) 1 mm
B) 2 mm
C) 3 mm
D) 4 mm
Answer: C
Explanation: Table 5.4 allows a maximum mismatch of 3 mm for butt joints.
What is the required NDT method for complete joint penetration (CJP) welds per AWS D1.1?
A) Visual Testing only
B) Radiographic or Ultrasonic Testing
C) Liquid Penetrant Testing
D) Magnetic Particle Testing
Answer: B
Explanation: Clause 6.14 specifies RT or UT for CJP welds, depending on the application.
Per AWS D1.1, what is the maximum allowable slag inclusion length in a weld?
A) 2 mm
B) 3 mm
C) 6 mm
D) 10 mm
Answer: C
Explanation: Table 6.1 permits slag inclusions up to 6 mm, depending on weld thickness.
What is the required interpass temperature range per AWS D1.1?
A) Below 100°C
B) Above 200°C
C) Same as preheat temperature
D) No limit specified
Answer: C
Explanation: Clause 5.8 requires interpass temperature to be at least the minimum preheat temperature.
Per AWS D1.1, who approves a WPS?
A) The welder
B) The inspector
C) The engineer
D) The NDT technician
Answer: C
Explanation: Clause 4.2.1 assigns the engineer responsibility for WPS approval.
What is the maximum allowable porosity spacing per AWS D1.1?
A) 1 mm apart
B) 2 mm apart
C) No limit specified
D) 4 mm apart
Answer: C
Explanation: Table 6.1 does not specify porosity spacing, only size and frequency.
Per AWS D1.1, what is the required minimum fillet weld size for a 25 mm thick plate?
A) 5 mm
B) 6 mm
C) 8 mm
D) 10 mm
Answer: B
Explanation: Table 5.7 specifies a minimum fillet weld size of 6 mm for plates 19–38 mm thick.
What is the maximum allowable incomplete fusion length per AWS D1.1?
A) 2 mm
B) 3 mm
C) 6 mm
D) None allowed
Answer: D
Explanation: Table 6.1 prohibits incomplete fusion in welds.
Per AWS D1.1, what is the required bend angle for a guided bend test?
A) 90 degrees
B) 180 degrees
C) 270 degrees
D) 360 degrees
Answer: B
Explanation: Clause 4.9.3.1 requires guided bend specimens to be bent 180 degrees.
What is the maximum allowable arc strike damage per AWS D1.1?
A) 1 mm
B) 2 mm
C) 3 mm
D) None allowed
Answer: D
Explanation: Clause 6.26.3 prohibits arc strikes due to their potential to initiate cracks.
Per AWS D1.1, what is the required visual acuity for a welding inspector?
A) 20/20
B) 20/30
C) 20/40
D) 20/50
Answer: C
Explanation: Clause 6.1.4.1 requires 20/40 vision or better, with or without correction.
What is the maximum allowable reinforcement for a fillet weld per AWS D1.1?
A) 1 mm
B) 2 mm
C) 3 mm
D) Not specified
Answer: D
Explanation: Table 6.1 does not specify reinforcement for fillet welds, only profile (e.g., convexity).
Per AWS D1.1, what is the required frequency of welder requalification?
A) Every 6 months
B) Every year
C) When skills are questioned
D) No requalification needed
Answer: C
Explanation: Clause 4.20.4 requires requalification if there is reason to question a welder’s ability.
What is the maximum allowable convexity for a 10 mm fillet weld per AWS D1.1?
A) 2 mm
B) 3 mm
C) 4 mm
D) 5 mm
Answer: C
Explanation: Table 6.1 limits convexity to 0.1 × 10 mm + 3 mm = 4 mm.
Per AWS D1.1, what is the required base metal preparation before welding?
A) Clean and free of defects
B) Painted for protection
C) Preheated to 500°C
D) No preparation needed
Answer: A
Explanation: Clause 5.14 requires base metal to be clean and free of defects like cracks or oil.
What is the maximum allowable incomplete penetration in a CJP weld per AWS D1.1?
A) 1 mm
B) 2 mm
C) 3 mm
D) None allowed
Answer: D
Explanation: Table 6.1 prohibits incomplete penetration in CJP welds.
Per AWS D1.1, what is the required number of bend tests for welder qualification?
A) 2
B) 4
C) 6
D) 8
Answer: B
Explanation: Clause 4.22.3 requires four bend tests (two face, two root) for welder qualification.
What is the maximum allowable slag inclusion width per AWS D1.1?
A) 1 mm
B) 2 mm
C) 3 mm
D) 4 mm
Answer: C
Explanation: Table 6.1 limits slag inclusion width to 3 mm or the weld thickness, whichever is smaller.
Per AWS D1.1, what is the required welding position for welder qualification?
A) Flat only
B) As specified in the WPS
C) Vertical only
D) Overhead only
Answer: B
Explanation: Clause 4.21 requires welders to qualify in positions specified by the WPS.
What is the maximum allowable porosity frequency per AWS D1.1?
A) 1 pore per inch
B) 2 pores per inch
C) 4 pores per 4 inches
D) Not specified
Answer: C
Explanation: Table 6.1 limits porosity to 4 pores in any 4-inch weld length for certain conditions.
Per AWS D1.1, what is the required electrode diameter for welder qualification?
A) 1/8 inch only
B) As specified in the WPS
C) 5/32 inch or less
D) No limit specified
Answer: B
Explanation: Clause 4.21 requires welders to use electrodes specified in the WPS.
What is the maximum allowable repair weld length per AWS D1.1?
A) 10% of weld length
B) 20% of weld length
C) 30% of weld length
D) No limit specified
Answer: D
Explanation: Clause 5.25 does not limit repair weld length, but repairs must meet acceptance criteria.
Per AWS D1.1, what is the required cooling rate for welds?
A) Below 100°C per minute
B) As specified in the WPS
C) Above 200°C per minute
D) No limit specified
Answer: B
Explanation: Clause 5.8 requires cooling rates to follow the WPS.
What is the maximum allowable undercut length per AWS D1.1?
A) 2 inches
B) 3 inches
C) 4 inches
D) No limit specified
Answer: D
Explanation: Table 6.1 limits undercut depth (1 mm) but not length, provided it meets other criteria.
Per AWS D1.1, what is the required documentation for a WPS?
A) Welder’s name
B) Essential variables
C) Inspector’s signature
D) Weld length only
Answer: B
Explanation: Clause 4.2.2 requires the WPS to document essential variables.
What is the maximum allowable defect size in a repair weld per AWS D1.1?
A) Same as original weld
B) 1/2 the original weld
C) 1/4 the original weld
D) No defects allowed
Answer: A
Explanation: Clause 5.25 requires repair welds to meet the same acceptance criteria as the original weld.
Per AWS D1.1, what is the required inspection method for welder qualification welds?
A) Visual only
B) Radiographic or bend testing
C) Ultrasonic testing
D) Liquid penetrant testing
Answer: B
Explanation: Clause 4.22.3 allows radiographic or bend testing for welder qualification welds.
What is the maximum allowable convexity for a 6 mm fillet weld per AWS D1.1?
A) 2 mm
B) 3 mm
C) 4 mm
D) 5 mm
Answer: B
Explanation: Table 6.1 limits convexity to 0.1 × 6 mm + 3 mm = 3.6 mm, rounded to 3 mm.
Per AWS D1.1, what is the required preheat for welding A572 Grade 50 steel 20 mm thick?
A) 10°C
B) 38°C
C) 66°C
D) 107°C
Answer: B
Explanation: Table 4.4 requires 38°C preheat for A572 Grade 50 steel 13–25 mm thick.
What is the maximum allowable number of repairs on a single weld per AWS D1.1?
A) 1
B) 2
C) 3
D) No limit specified
Answer: D
Explanation: Clause 5.25 does not limit the number of repairs, provided they meet acceptance criteria.
Per AWS D1.1, what is the required joint preparation tolerance for a butt weld?
A) ±1 mm
B) ±2 mm
C) ±3 mm
D) ±4 mm
Answer: B
Explanation: Clause 5.21.1 allows a tolerance of ±2 mm for joint preparation dimensions.
What is the maximum allowable porosity diameter for a butt weld per AWS D1.1?
A) 1 mm
B) 2 mm
C) 3 mm
D) 4 mm
Answer: B
Explanation: Table 6.1 limits single pore diameter to 2 mm for butt welds.
Per AWS D1.1, what is the required welder qualification position for fillet welds?
A) Flat only
B) As specified in the WPS
C) Vertical only
D) Overhead only
Answer: B
Explanation: Clause 4.21 requires qualification in positions specified by the WPS.
What is the maximum allowable incomplete fusion depth per AWS D1.1?
A) 1 mm
B) 2 mm
C) 3 mm
D) None allowed
Answer: D
Explanation: Table 6.1 prohibits incomplete fusion in welds.
Per AWS D1.1, what is the required storage time for low-hydrogen electrodes after oven drying?
A) 4 hours
B) 8 hours
C) 12 hours
D) No limit specified
Answer: A
Explanation: Clause 5.3.2.2 allows low-hydrogen electrodes to be used within 4 hours of removal from the oven.
What is the maximum allowable defect repair length in a single weld per AWS D1.1?
A) 10% of weld length
B) 20% of weld length
C) 30% of weld length
D) No limit specified
Answer: D
Explanation: Clause 5.25 does not specify a maximum repair length.
Per AWS D1.1, what is the required qualification for a welding inspector?
A) AWS-CWI certification
B) Company approval
C) Engineer approval
D) No qualification specified
Answer: B
Explanation: Clause 6.1.4 requires inspectors to be approved by the company.
What is the maximum allowable slag inclusion length for a 25 mm thick weld per AWS D1.1?
A) 3 mm
B) 6 mm
C) 9 mm
D) 12 mm
Answer: B
Explanation: Table 6.1 limits slag inclusion length to 6 mm for welds up to 25 mm thick.
Per AWS D1.1, what is the required cooling rate for welds?
A) Below 100°C per minute
B) As specified in the WPS
C) Above 200°C per minute
D) No limit specified
Answer: B
Explanation: Clause 5.8 requires cooling rates to follow the WPS.
What is the maximum allowable undercut depth for cyclically loaded structures per AWS D1.1?
A) 0.5 mm
B) 1.0 mm
C) 1.5 mm
D) 2.0 mm
Answer: A
Explanation: Clause 6.26.2.1 limits undercut to 0.5 mm for cyclically loaded structures to prevent fatigue failure.

Notes for Preparation

Code Familiarity: Practice navigating API 1104 and AWS D1.1 quickly, as Part C is time-constrained (2 hours for ~46–60 questions). Tab key sections like acceptance criteria (API 1104 Section 9, AWS D1.1 Table 6.1), welder qualification (API 1104 Section 6, AWS D1.1 Clause 4), and preheat requirements.
Key Differences:
- API 1104: Focuses on pipeline welding, emphasizing radiographic evaluation and pipeline-specific defects like burn-through. Tolerances are often in inches (e.g., 1/32 inch for undercut).
- AWS D1.1: Focuses on structural steel, with stricter rules for cracks and incomplete fusion. Measurements are often in metric (e.g., 1 mm for undercut).
Resources: Use the Welding Inspection Technology Workbook (AWS), API 1104 21st Edition, and AWS D1.1:2020. Practice with AWS sample questions.
Strategy: During the exam, skim questions to identify keywords (e.g., “undercut,” “porosity”), then locate the relevant table or clause. Mark answers and move on to maintain pace.

AWS-CWI Part- C AWS D1.1 Questions Answers