AWS Weld Inspection & Quality Control 2 — Questions and Answers
Question 1: Which destructive test is used to evaluate the ductility and soundness of a weld by bending a specimen over a specified radius?
- Charpy impact test
- Guided bend test (Correct answer)
- Hardness test
- Tensile test
Correct answer: Guided bend test
The guided bend test bends a weld specimen over a defined die radius to reveal surface or subsurface discontinuities and assess ductility.
Question 2: In ultrasonic testing (UT), what does the term 'DAC curve' stand for?
- Distance Amplitude Correction curve (Correct answer)
- Defect Attenuation Coefficient curve
- Dynamic Acceptance Criteria curve
- Depth Adjusted Calibration curve
Correct answer: Distance Amplitude Correction curve
DAC (Distance Amplitude Correction) curve compensates for signal attenuation with increasing sound path distance in UT.
Question 3: What type of weld discontinuity is characterized by base metal melting away at the weld toe, creating a groove?
- Overlap
- Undercut (Correct answer)
- Porosity
- Incomplete fusion
Correct answer: Undercut
Undercut is a groove melted into the base metal along the weld toe or root that is not filled by weld metal.
Question 4: According to AWS D1.1, which organization's RT film must be used when performing radiographic testing on structural welds?
- Any film meeting ISO 11699 Class C1
- Any film providing acceptable image quality as verified by IQI (Correct answer)
- Only ASTM-certified film
- Only film approved by the AWS CWI
Correct answer: Any film providing acceptable image quality as verified by IQI
AWS D1.1 requires that the radiographic film produce acceptable image quality as demonstrated by the image quality indicator (IQI), not a specific brand.
Question 5: A weld inspector finds a crack indications in a liquid penetrant test. What is the FIRST action that should be taken?
- Accept the weld if the crack is under 1/4 inch
- Mark and document the indication location before doing anything else (Correct answer)
- Immediately grind out the crack and reweld
- Perform a magnetic particle test to confirm
Correct answer: Mark and document the indication location before doing anything else
The first step is to mark and document the indication so that its exact location is recorded before any repair or further evaluation.
Question 6: Which welding variable, if changed beyond a prequalified range, requires requalification of the welding procedure specification (WPS)?
- Welder's name
- Ambient temperature (within acceptable limits)
- Base metal P-number group (Correct answer)
- Time of day welding is performed
Correct answer: Base metal P-number group
A change in the base metal P-number (material grouping) is an essential variable that requires WPS requalification.
Question 7: When using magnetic particle testing (MT) on a weld, which discontinuity orientation is LEAST likely to be detected?
- Transverse crack perpendicular to current flow
- Longitudinal crack parallel to the weld axis
- Subsurface lamination parallel to the surface (Correct answer)
- Surface porosity
Correct answer: Subsurface lamination parallel to the surface
MT detects surface and near-surface discontinuities; a lamination parallel to the part surface produces very little flux leakage and is the least detectable.
AWS Weld Inspection & Quality Control 2
Which destructive test is used to evaluate the ductility and soundness of a weld by bending a specimen over a specified radius?