AWS-CWI Part- C API 1104 Questions Answers
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.
