Certified Welder Welding Codes and Standards 2 — Questions and Answers
Question 1: Under AWS D1.1, what is the minimum preheat temperature required for ASTM A36 steel with thickness greater than 1.5 inches when welding with SMAW?
- 50°F (10°C)
- 150°F (65°C) (Correct answer)
- 225°F (107°C)
- 300°F (149°C)
Correct answer: 150°F (65°C)
AWS D1.1 Table 4.5 requires a minimum preheat of 150°F for A36 steel over 1.5 inches thick when using SMAW.
Question 2: Which ASME code section specifically governs the welding of pressure vessels?
- Section I
- Section VIII (Correct answer)
- Section IX
- Section XI
Correct answer: Section VIII
ASME Section VIII covers unfired pressure vessels, while Section IX covers welding and brazing qualifications.
Question 3: What does the term 'essential variable' mean in the context of a Welding Procedure Specification (WPS)?
- A variable that improves weld quality
- A variable whose change requires requalification of the procedure (Correct answer)
- A variable listed in the base metal grouping
- A variable that is optional to document
Correct answer: A variable whose change requires requalification of the procedure
An essential variable is one whose change beyond allowed limits requires a new procedure qualification record (PQR).
Question 4: According to AWS D1.1, visual inspection of a weld must be performed by a person with minimum vision of:
- 20/20 corrected vision only
- 20/40 corrected or uncorrected vision in at least one eye (Correct answer)
- 20/30 uncorrected vision
- No specific vision requirement is stated
Correct answer: 20/40 corrected or uncorrected vision in at least one eye
AWS D1.1 requires the inspector to have 20/40 minimum vision (corrected or uncorrected) in at least one eye.
Question 5: A Procedure Qualification Record (PQR) documents the:
- Welding instructions given to the welder
- Variables used and test results from a qualification weld (Correct answer)
- Welder's personal certification history
- List of approved filler metals for a project
Correct answer: Variables used and test results from a qualification weld
A PQR records the actual welding variables used during qualification testing and the test results that support the WPS.
Question 6: Under AWS D1.1, which discontinuity type is considered a 'crack' and is always rejectable regardless of size?
- Porosity
- Undercut
- Lack of fusion
- Longitudinal crack in the weld metal (Correct answer)
Correct answer: Longitudinal crack in the weld metal
Cracks of any type, size, or location are absolutely rejectable under AWS D1.1 with no size tolerance.
Question 7: Which AWS standard governs structural welding of sheet steel?
- AWS D1.1
- AWS D1.3 (Correct answer)
- AWS D1.5
- AWS D1.8
Correct answer: AWS D1.3
AWS D1.3 is the Structural Welding Code for Sheet Steel, covering material 3/16 inch and thinner.
Certified Welder Welding Codes and Standards 2
Under AWS D1.1, what is the minimum preheat temperature required for ASTM A36 steel with thickness greater than 1.5 inches when welding with SMAW?