46 Latest AWS CWI Part B Exam Practice Questions with Answers and Explanations (Metric & Imperial Units)
Are you preparing for the AWS Certified Welding Inspector (CWI) Part B Practical Exam? We’ve created a complete mock test based on the latest official AWS exam guide. These 46 AWS CWI Part B Exam practice questions are designed to help you understand real exam conditions, using plastic replicas, inspection tools, and BoS (Book of Specifications) references.
This mock test includes:
- 46 Questions based on official exam content
- Answer Key after each question
- A brief explanation for every correct answer
- Measurements in both Metric (mm) and Imperial (inch) units
- Covers key topics: visual inspection, weld flaws, BoS interpretation, measuring tools, and WPS compliance.
About the AWS CWI Part B Exam:
The AWS CWI Part B Practical Exam tests your ability to:
- Inspect weld replicas using tools
- Read the AWS Book of Specifications
- Identify discontinuities (defects) like porosity, cracks, undercut
- Use measuring instruments like V-WAC, fillet weld gauge, Bridge-Cam
- Apply WPS/PQR and code-based criteria to real-world welding scenarios
- You’ll be asked 46 questions in 2 hours. A passing score is 72%.
You can take a free practice test for the AWS CWI Part B Exam Quiz course here.
AWS CWI Part B Practice Test (46 Questions with Answers)
Below are all 46 mock questions. Click/tap each to reveal the correct answer and explanation.
Note: This set is useful for anyone preparing for metric or inch versions of the exam.
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AWS CWI Part B – Full Mock Exam (46 Questions)
Below are 46 mock questions formatted with clickable answers. Click/tap each question to reveal the correct answer and explanation.
Q1. Weld Discontinuity – Undercut
A groove weld on a 12 mm (0.5 in) thick plate shows an undercut of 1.2 mm (0.047 in) in length over 40 mm (1.57 in). Is this acceptable?
- A. Yes – Within tolerance
- B. No – Exceeds depth limit
- C. Yes – Length is short enough
- D. No – Exceeds length limit
Explanation: Max undercut depth for thickness > 6 mm is 0.8 mm (BoS Clause 5.6.2).
Q2. Weld Size Inspection – Fillet Throat
A fillet weld is specified to be 6 mm (0.24 in). What is the minimum required throat dimension?
- A. 3.2 mm
- B. 4.2 mm
- C. 4.5 mm
- D. 5.2 mm
Explanation: Throat = 0.707 × leg = 0.707 × 6 = 4.24 mm.
Q3. Visual Inspection – Porosity
You find 4 pores in a 25 mm (1 in) weld segment. The largest is 1.8 mm (0.07 in). The BoS limit for porosity grouping is 3 pores in 25 mm. Is the weld acceptable?
- A. Yes – Diameter is below max
- B. No – Too many pores in 25 mm
- C. No – Any group is rejectable
- D. Yes – Porosity is not cause for rejection
Explanation: More than 3 pores in 25 mm exceeds limits (BoS Clause 5.9.2).
Q4. WPS Compliance – Reinforcement
WPS allows max reinforcement of 2 mm (0.08 in). Actual weld measured at 2.6 mm. What is the action?
- A. Acceptable
- B. Accept if weld is sound
- C. Reject – Exceeds allowed limit
- D. Accept with engineering approval
Explanation: Reinforcement above allowed value per WPS must be rejected.
Q5. Tools – Measuring Weld Reinforcement
Which tool is best suited for measuring reinforcement height?
- A. Fillet gauge
- B. V-WAC gauge
- C. Bridge Cam gauge
- D. Hi-Lo gauge
Explanation: Bridge Cam gauge measures reinforcement, undercut, and angle.
Q6. Gauging Root Opening
Root opening measured is 2.8 mm (0.11 in). If the WPS allows a range of 1.5–2.5 mm (0.06–0.10 in), what’s the result?
- A. Acceptable
- B. Reject – Outside WPS range
- C. Accept with inspection approval
- D. Accept if penetration is good
Explanation: Root opening must comply with WPS limits.
Q7. Book of Specifications – Preheat Temp
According to BoS, what is the minimum preheat for carbon steel plate over 20 mm (0.79 in) thick?
- A. 50°C (122°F)
- B. 100°C (212°F)
- C. 150°C (302°F)
- D. Not required
Explanation: BoS Clause 3.2 specifies preheat based on material thickness.
Q8. Weld Profile – Convexity
Convexity of a fillet weld measures 2.5 mm (0.1 in) on a 6 mm leg weld. BoS allows max convexity = 1/8 of leg size. Is it acceptable?
- A. Yes
- B. No – Exceeds limit
- C. Acceptable if not cracked
- D. Only under engineering override
Explanation: Max convexity for 6 mm weld = 0.75 mm (⅛ × 6).
Q9. Overlap
A groove weld has 0.9 mm (0.035 in) overlap. BoS allows a max of 0.8 mm (0.031 in). What’s the disposition?
- A. Accept
- B. Reject
- C. Rework optional
- D. No effect
Explanation: BoS Clause 5.6.4 – Overlap exceeding 0.8 mm must be rejected.
Q10. Fillet Weld – Actual Size
The specified fillet size is 8 mm (0.31 in). Actual measured leg = 6 mm. What is the disposition?
- A. Acceptable
- B. Reject – Undersized
- C. Accept if length is sufficient
- D. Accept with engineering approval
Explanation: Undersized welds below specified leg dimension must be rejected.
Q11. Weld Gauge Reading
You use a Bridge Cam gauge and measure reinforcement of 3.2 mm (0.126 in). The BoS limit is 2 mm (0.08 in). What’s the result?
- A. Acceptable
- B. Reject – Exceeds reinforcement limit
- C. Accept with note in report
- D. Ignore – not critical
Explanation: BoS restricts reinforcement to 2 mm maximum.
Q12. Crater Crack
A crater crack is found at the end of a weld. What does the BoS require?
- A. Accept if less than 1 mm
- B. Reweld or grind out
- C. Acceptable if not on face
- D. Accept if no spatter
Explanation: Crater cracks are unacceptable and must be repaired.
Q13. Incomplete Fusion
During VT, you notice incomplete fusion on one side of the joint. What is the correct action?
- A. Accept if not deeper than 2 mm
- B. Reject
- C. Accept with UT
- D. Rework if over 50 mm long
Explanation: Incomplete fusion is a critical defect – reject per BoS Clause 5.10.
Q14. Discontinuity – Crack
What is the acceptance criteria for cracks in welds per the BoS?
- A. Allowed if short
- B. Allowed if not open to surface
- C. Not permitted under any circumstance
- D. Only allowed with engineer’s approval
Q15. WPS – Essential Variables
Which of the following is considered an essential variable in a WPS?
- A. Cleaning method
- B. Travel angle
- C. Filler metal classification
- D. Post-weld painting
Q16. Tolerances – Fillet Weld Size
Design calls for a 6 mm (0.24 in) fillet weld. Measured leg size is 4.5 mm (0.18 in). Is this acceptable?
- A. Yes – Within tolerance
- B. No – Undersized weld
- C. Yes – Undersize allowed with approval
- D. Acceptable if intermittent weld
Q17. Weld Profile – Concavity
Concave fillet welds must be evaluated for what primary concern?
- A. Appearance
- B. Undercut depth
- C. Throat thickness
- D. Crack sensitivity
Q18. Interpretation – Weld Symbol
What does a flag on a weld symbol indicate?
- A. Field weld
- B. All-around weld
- C. Backing required
- D. Weld to be inspected
Q19. Code Book – Clause Navigation
Where can you find acceptance criteria for visual inspection in the BoS?
- A. Clause 2
- B. Clause 4
- C. Clause 5
- D. Clause 6
Q20. Defect vs Discontinuity
Which of the following is a correct statement?
- A. All discontinuities are defects
- B. Defects are acceptable if small
- C. All defects are discontinuities
- D. Defects can always be repaired
Q21. Backing – Welding Setup
What is the main purpose of a backing bar in welding?
- A. Provide root reinforcement
- B. Prevent undercut
- C. Maintain heat input
- D. Control weld profile
Q22. Weld Terminology – Face
What is the exposed surface of a completed weld called?
- A. Root
- B. Face
- C. Throat
- D. Toe
Q23. Welding Symbols – Tail Use
What is typically placed in the tail of a welding symbol?
- A. Welding position
- B. Number of passes
- C. Reference to process or spec
- D. Weld size
Q24. Weld Gauge Use
Which tool is typically used to measure fillet weld leg size?
- A. Micrometer
- B. V-WAC gauge
- C. Hi-Lo gauge
- D. Fillet weld gauge
Q25. Code Interpretation – BoS Clause
Which clause in the BoS covers visual inspection?
- A. Clause 2
- B. Clause 4
- C. Clause 5
- D. Clause 7
Q26. Undercut Evaluation
Which of the following undercut depths is unacceptable per BoS for a fillet weld?
- A. 0.4 mm
- B. 0.7 mm
- C. 0.2 mm
- D. 0.5 mm
Q27. Root Opening – Fit-Up
Root opening too large can result in:
- A. Excessive reinforcement
- B. Lack of fusion
- C. Burn-through
- D. Porosity
Q28. Crack Orientation
A transverse crack is oriented:
- A. Along the weld axis
- B. At the root of weld
- C. Perpendicular to weld axis
- D. In the base metal only
Q29. Incomplete Fusion
Incomplete fusion may be caused by:
- A. Excessive travel speed
- B. High amperage
- C. Low arc voltage
- D. Improper joint design
Q30. Weld Joint Types
Which of the following is not a basic weld joint type?
- A. T-joint
- B. Edge joint
- C. Corner joint
- D. Buttress joint
Q31. Maximum Reinforcement
According to BoS, the maximum reinforcement for groove welds is:
- A. 3 mm
- B. 2 mm
- C. 4 mm
- D. 1 mm
Q32. WPS – Position
If a WPS is qualified in 1G position, it may be used in:
- A. All positions
- B. Flat position only
- C. Vertical and overhead
- D. Horizontal only
Q33. Fillet Weld – Effective Throat
What is the effective throat of a 6 mm equal leg fillet weld?
- A. 4.2 mm
- B. 3.0 mm
- C. 6.0 mm
- D. 5.0 mm
Q34. Discontinuity vs Defect
What is the primary difference between a discontinuity and a defect?
- A. All discontinuities are defects
- B. Defects are always acceptable
- C. Discontinuities may or may not be rejectable
- D. Discontinuities require no inspection
Q35. Welding Symbols – Tail
Information such as WPS or process is often found where in a welding symbol?
- A. Arrow
- B. Reference line
- C. Tail
- D. Fillet symbol
Q36. Acceptance Criteria – Porosity
Per BoS, porosity in a groove weld is acceptable if:
- A. It’s less than 2 mm
- B. It doesn’t exceed 5 mm total in 25 mm
- C. It’s completely uniform
- D. It occurs on the root face
Q37. Visual Inspection Equipment
Which of the following is essential for visual weld inspection?
- A. Thermometer
- B. Bridge cam gauge
- C. Taper gauge
- D. Surface comparator
Q38. Back Gouging
What is the purpose of back gouging a weld?
- A. To remove porosity
- B. To improve appearance
- C. To ensure full penetration
- D. To clean the root pass
Q39. Hi-Lo Gauge Use
The Hi-Lo gauge is commonly used to:
- A. Measure weld reinforcement
- B. Check pipe misalignment
- C. Determine leg length
- D. Check porosity
Q40. Overlap Indication
What does overlap typically indicate in a weld?
- A. Poor fusion
- B. Excessive heat input
- C. Improper travel angle
- D. Incorrect base metal
Q41. Welding Positions – 3G
3G refers to which welding position?
- A. Flat groove
- B. Vertical groove
- C. Overhead fillet
- D. Horizontal groove
Q42. Discontinuity Length
According to the BoS, the maximum allowable length for a linear indication in a groove weld is:
- A. 10 mm
- B. 12 mm
- C. 25 mm
- D. 6 mm
Q43. Concavity
What is concavity in a weld profile?
- A. Excess weld buildup
- B. A depression in the weld face
- C. Surface porosity
- D. An overlap indication
Q44. Edge Joint Inspection
In an edge joint, which type of discontinuity is most likely?
- A. Undercut
- B. Lack of fusion
- C. Burn-through
- D. Slag inclusion
Q45. Slag Inclusion Prevention
Slag inclusions can be prevented by:
- A. Increasing arc length
- B. Using more filler metal
- C. Cleaning between passes
- D. Using high voltage
Q46. Weld Size Acceptance
A fillet weld with a leg size of 5 mm is acceptable per BoS if the minimum required is:
- A. 4 mm
- B. 6 mm
- C. 5 mm
- D. 7 mm