Section 6 Qualification of Welders – CWI Part C

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Section 6 Qualification of Welders – CWI Part C Practice Test

Prepare for the AWS CWI Part C Open Book Exam with this free practice test based on API 1104 Section 6: Qualification of Welders. This section is very important because it explains how welders are qualified, how test welds are examined, what essential variables apply to welder qualification, and when requalification is required.

In this quiz, you can take a free practice test with the latest exam-style questions and answers for CWI Part C API 1104 Section 6 Qualification of Welders.

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This free quiz is designed for AWS CWI candidates, welding inspectors, QA/QC inspectors, pipeline welding professionals, welding supervisors, and students preparing for the AWS CWI Part C exam using API 1104.

Section 6 focuses on proving the welder’s ability to make sound welds using qualified welding procedures. Welders must qualify by testing before they are allowed to perform production welding.

Quiz Details

Quiz Name: Section 6 Qualification of Welders – CWI Part C
Standard Covered: API 1104
Exam Type: AWS CWI Part C Practice Test
Total Questions: 8 Questions
Question Type: Multiple Choice Questions
Level: Exam Preparation Level

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What Is Covered in API 1104 Section 6?

API 1104 Section 6 covers the qualification requirements for welders. The purpose of welder qualification is to confirm that the welder can produce acceptable welds using a qualified welding procedure.

A welder must pass the required qualification test before performing production welding. The test must be conducted in the presence of a representative acceptable to the company.

This section also explains single qualification, multiple qualification, visual examination, destructive testing, nondestructive testing, retesting, and records.

Main Topics Covered in Section 6

6.1 General

Welder qualification proves the welder’s ability to make sound welds. A welder who successfully completes a welding procedure qualification test may also be qualified, provided all test specimens required by API 1104 are successfully tested.

The essential variables for welder qualification are different from the essential variables for welding procedure qualification. This is an important point for the CWI Part C exam.

Single Qualification

Single qualification requires separate qualification tests for groove welds and fillet welds.

For butt weld qualification, the welder makes a butt weld in either the fixed or rolled position. The pipe axis may be horizontal, vertical, or inclined from the horizontal at an angle of not more than 45 degrees.

For branch connection welds or fillet welds, the welder makes the test weld in the position and orientation specified by the welding procedure.

The completed test weld must meet visual examination requirements and either destructive testing requirements or nondestructive testing requirements for butt welds only.

Essential Variables for Single Qualification

A welder qualified by a single qualification must requalify if changes are made outside the permitted range. Important essential variables include:

• Change in welding process or combination of processes

• Change in direction of welding from uphill to downhill or downhill to uphill

• Change in filler metal classification beyond permitted grouping rules

• Change from one outside diameter group to another

• Change from one wall thickness group to another

• Change in welding position outside permitted exceptions

• Change in joint design, such as deleting backing or changing edge preparation

A key exam point is that the outside diameter is an essential variable for welder qualification, even though it is not an essential variable for welding procedure qualification.

Multiple Qualification

Multiple qualifications give the welder a wider range of qualifications. It generally qualifies the welder for all positions, all wall thicknesses, joint designs, and fittings, subject to the diameter range qualified during testing.

Multiple qualifications require two test welds:

1. A butt weld in the fixed position using pipe with a minimum outside diameter of 6.625 inches and a minimum wall thickness of 0.250 inches, welded without backing.

2. A branch-on-pipe connection weld, where the welder lays out, cuts, fits, and welds two pipes of equal diameter in the form of a T.

The branch connection weld is made with the run pipe horizontal and the branch extending vertically downward, so the weld is made in the overhead position.

Essential Variables for Multiple Qualifications

A welder holding multiple qualifications must requalify if there is:

• A change from one welding process to another process or a combination of processes

• A change in welding direction from uphill to downhill or downhill to uphill

• A change in filler metal classification outside the permitted API 1104 grouping rules

If the welder successfully completes the multiple qualification test on pipe 12.750 inches in diameter or larger, the welder is qualified for all pipe diameters. If the test is completed on pipe smaller than 12.750 inches in diameter, the welder is qualified only for pipe diameters equal to or less than the test pipe diameter.

Visual Examination

Visual examination must be completed before preparing samples for mechanical testing.

The test weld is automatically rejected if visual examination shows:

• Cracks

• Inadequate penetration

• Burn-through

• Unacceptable undercut

The inspector may also reject a weld if it does not have a neat and workmanlike appearance.

For semiautomatic or mechanized welding processes, excessive filler wire protruding into the inside of the pipe may also be a cause for rejection.

Destructive Testing

Destructive testing for welder qualification includes test specimens removed from the completed test weld. The number and type of specimens depend on the pipe size and are listed in API 1104 Table 3.

Candidates should not confuse Table 3 with Table 2. Table 2 is used for procedure qualification, while Table 3 is used for welder qualification.

Common destructive tests include:

• Tensile strength test

• Nick break test

• Root bend test

• Face bend test

• Side bend test

For welder qualification, the purpose is mainly to determine the welder’s ability to deposit sound weld metal.

Tensile Strength Test

For welder qualification, the tensile strength test is treated mainly as a weld soundness test.

If the specimen fails in the weld or at the junction of the weld and base metal, the fractured surface must meet the nick break acceptance criteria.

If the specimen fails in the parent material, the weld metal is considered acceptable.

Nick Break Test

Nick break specimens for welder qualification must meet the same acceptance criteria used for procedure qualification. These criteria check the exposed weld surface for fusion, penetration, pores, slag inclusions, and other unacceptable discontinuities.

Bend Testing

Bend test requirements for welder qualification are similar to those used for procedure qualification.

For high-strength pipe, a bend specimen may crack or break before bending into a full U shape. In that case, the specimen may still be acceptable if the exposed surfaces meet the nick break test acceptance criteria.

The company may also permit one additional bend specimen from the same test weld if the original failure is not considered representative of the weld. If the additional specimen fails, the welder is disqualified.

Fillet Weld Testing

For fillet weld qualification, four nick break specimens are removed from the test weld at approximately 90 degree intervals.

Fillet weld specimens must meet the acceptance criteria given for fillet weld procedure qualification. This confirms the welder’s ability to make acceptable fillet welds such as socket welds and branch connection welds.

Nondestructive Testing for Butt Welds Only

At the company’s option, a welder qualification butt weld may be examined by radiographic testing or automatic ultrasonic testing instead of mechanical testing.

This option applies to butt welds only. NDT cannot be used to purposely locate sound or defective areas and then test only those areas to qualify or disqualify a welder.

Candidates should also remember that jurisdictional requirements may restrict the use of NDT in place of mechanical testing.

Retesting

If a welder fails a qualification test, retesting may be allowed when the company and the welder’s representative agree that the welder was not at fault.

If the welder fails the second test, the welder must provide proof of additional welder training acceptable to the company before taking a third test.

Records

API 1104 requires records of welder qualification test results to be maintained.

The company must also maintain a list of welders and the procedures for which they are qualified. If a welder’s ability comes into question, the welder may be required to requalify.

What You Will Learn in This Quiz

This practice test will help you understand:

• Purpose of welder qualification

• Difference between procedure qualification and welder qualification

• Single qualification requirements

• Multiple qualification requirements

• Welder qualification essential variables

• Visual examination requirements

• Destructive testing requirements

• Use of Table 3 for welder qualification

• Tensile, nick break, and bend test requirements

• Fillet weld qualification requirements

• NDT option for butt welds only

• Retesting requirements

• Welder qualification record requirements

Why Practice Section 6 Qualification of Welders?

Section 6 is an important part of API 1104 and is frequently used in AWS CWI Part C exam preparation. This section contains many practical code requirements related to welder qualification, test positions, essential variables, visual acceptance, testing, and records.

Practicing Section 6 questions will help you improve code navigation, understand qualification limits, and avoid common mistakes during the open book exam.

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Quiz – Section 6 Qualification of Welders – CWI Part C – 8 Questions
https://upweld.org/section-6-qualification-of-welders-cwi-part-c/

Who Should Take This Practice Test?

This quiz is useful for:

• AWS CWI exam candidates

• CWI Part C API 1104 students

• Welding inspectors

• QA/QC inspectors

• Pipeline welding professionals

• Welding supervisors

• Welding engineers

• NDT technicians

• Students preparing for open-book code exams

Prepare Better for AWS CWI Part C

If you are preparing for the AWS CWI Part C exam, Section 6 Qualification of Welders is a must-practice topic. It helps candidates understand how welders are qualified, when requalification is needed, and how test welds are examined and accepted.

Take the free practice test now and improve your preparation for the AWS CWI Part C API 1104 exam.

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