CWI Codebook Navigation and Application Questions and Answers — Questions and Answers
Question 1: A welder successfully completes a performance qualification test on a 1-inch thick plate groove weld in the 3G (vertical-up) position according to AWS D1.1. For which of the following weld types and positions is this welder now also qualified?
- Groove welds in the 4G (overhead) position.
- Fillet welds in the 1F, 2F, and 3F positions. (Correct answer)
- Both groove and fillet welds in all positions.
- Only groove welds in the 3G position.
Correct answer: Fillet welds in the 1F, 2F, and 3F positions.
AWS D1.1, Table 6.10, 'Welder and Welding Operator Qualification Type and Position Limitations,' specifies that a successful groove weld test in the 3G position qualifies a welder for groove welds in the F (flat) and V (vertical) positions, and for fillet welds in the F (flat), H (horizontal), and V (vertical) positions. Therefore, they are qualified for fillet welds in the 1F, 2F, and 3F positions. Qualification in 3G does not grant qualification for the 4G (overhead) position.
Question 2: An inspector needs to verify the essential variables for a welder's performance qualification (WPQ). In which major part and article of the ASME Boiler and Pressure Vessel Code, Section IX, would this information be primarily located?
- Part QG, General Requirements.
- Part QB, Brazing.
- Part QW, Article III, Welding Performance Qualifications. (Correct answer)
- Part QW, Article I, General Requirements for Welding.
Correct answer: Part QW, Article III, Welding Performance Qualifications.
ASME Section IX is structured into distinct parts. Part QW covers welding. Within Part QW, Article I (QW-100s) covers general requirements, Article II (QW-200s) covers Welding Procedure Qualifications, and Article III (QW-300s) specifically addresses Welding Performance Qualifications. Article IV (QW-400s) contains the Welding Data, including the lists of variables.
Question 3: A welder performs a single qualification test for butt welds on a 6-inch nominal diameter pipe (OD = 6.625 inches) in the 5G position, in accordance with API 1104. Based on this test, what is the range of outside diameters the welder is qualified to weld in production?
- All pipe with an outside diameter greater than or equal to 2.375 inches. (Correct answer)
- Only pipe with an outside diameter of 6.625 inches.
- All pipe with an outside diameter less than or equal to 12.750 inches.
- All pipe diameters without restriction.
Correct answer: All pipe with an outside diameter greater than or equal to 2.375 inches.
According to API 1104, Section 6.2.2.d, 'A welder who has successfully completed the butt weld qualification test on pipe with an OD ≥ 2.375 in. (60.3 mm) shall be qualified to weld on all pipe sizes, wall thicknesses, and material grades.' Since 6.625 inches is greater than 2.375 inches, the welder is qualified for all pipe diameters greater than or equal to 2.375 inches.
Question 4: An inspector is visually examining a groove weld on a 1.5-inch thick non-tubular steel plate for a statically loaded structure, governed by AWS D1.1. Which of the following amounts of undercut would be acceptable?
- 3/32 inch deep for any length.
- 1/32 inch deep, but only if the accumulated length does not exceed 2 inches in any 12 inches.
- Any amount of undercut is a defect and must be repaired.
- 1/16 inch deep for a continuous length of 4 inches. (Correct answer)
Correct answer: 1/16 inch deep for a continuous length of 4 inches.
According to AWS D1.1, Table 8.1, 'Visual Inspection Acceptance Criteria' for Statically Loaded Nontubular Connections, for base material over 1 inch thick, undercut shall not exceed 1/16 inch in depth. The code does not place a length restriction on this depth for statically loaded structures, so a 1/16 inch deep undercut is acceptable. The 1/32 inch limit applies to material up to 1 inch thick.
Question 5: A fabricator has a Procedure Qualification Record (PQR) that was successfully qualified using the Shielded Metal Arc Welding (SMAW) process. The welding engineer now wishes to write a Welding Procedure Specification (WPS) for a production job using the Gas Metal Arc Welding (GMAW) process. According to ASME Section IX, which of the following is true?
- The SMAW PQR can support the GMAW WPS as long as the base material and thickness are the same.
- A change from SMAW to GMAW is considered an essential variable change requiring a new PQR. (Correct answer)
- The SMAW PQR can support the GMAW WPS if a new welder performance qualification is completed with the GMAW process.
- A new PQR is only required if the GMAW process uses a different P-Number base material.
Correct answer: A change from SMAW to GMAW is considered an essential variable change requiring a new PQR.
According to ASME Section IX, QW-251.2, each welding process must be qualified separately. Furthermore, QW-402.1 lists a change in the welding process as an essential variable. An essential variable is a parameter that, if changed, is considered to affect the mechanical properties of the weldment and therefore requires the WPS to be requalified by creating a new PQR.
Question 6: For a new butt weld procedure qualification on a 10-inch diameter, standard wall (0.365-inch) pipe, which of the following sets of destructive test specimens is required at a minimum by API 1104?
- Two tensile tests, two side bend tests, and one macro etch.
- Four side bend tests and one impact test specimen set.
- One tensile test, one nick-break test, one root bend test, and one face bend test.
- Two tensile tests, two nick-break tests, two root bend tests, and two face bend tests. (Correct answer)
Correct answer: Two tensile tests, two nick-break tests, two root bend tests, and two face bend tests.
API 1104, Section 5.6 and Table 1 specify the 'Type and Number of Test Specimens for Procedure Qualification Test.' For a butt weld on pipe with an outside diameter greater than or equal to 4.500 inches and a wall thickness less than 0.500 inches, the code requires a minimum of two tensile strength specimens, two nick-break specimens, two root bend specimens, and two face bend specimens.
CWI Codebook Navigation and Application Questions and Answers
A welder successfully completes a performance qualification test on a 1-inch thick plate groove weld in the 3G (vertical-up) position according to AWS D1.1.
For which of the following weld types and positions is this welder now also qualified?