CRI CRI Acceptance Criteria & Discontinuity Evaluation 1 — Questions and Answers
Question 1: According to AWS D1.1, what is the maximum allowable length of an individual porosity indication in a complete joint penetration groove weld?
- 3/8 inch (9.5 mm) (Correct answer)
- 1/4 inch (6.4 mm)
- 1/2 inch (12.7 mm)
- 5/16 inch (7.9 mm)
Correct answer: 3/8 inch (9.5 mm)
AWS D1.1 limits individual porosity indications in CJP groove welds to a maximum of 3/8 inch (9.5 mm) in diameter.
Question 2: When evaluating linear indications per ASME Section V, what minimum length causes an indication to be classified as 'relevant'?
- 1/16 inch (1.6 mm) (Correct answer)
- 1/8 inch (3.2 mm)
- 3/16 inch (4.8 mm)
- 1/4 inch (6.4 mm)
Correct answer: 1/16 inch (1.6 mm)
ASME Section V classifies any linear indication 1/16 inch (1.6 mm) or greater as relevant and subject to acceptance criteria evaluation.
Question 3: Which discontinuity type is generally considered MOST detrimental to weld structural integrity under cyclic loading?
- Cracks (Correct answer)
- Porosity
- Slag inclusions
- Undercut
Correct answer: Cracks
Cracks are the most critical discontinuity under cyclic loading because their sharp tips act as stress concentrators that propagate under fatigue.
Question 4: In radiographic interpretation, an elongated slag inclusion running parallel to the weld axis is best described as which type of discontinuity?
- Wagon tracks (Correct answer)
- Wormhole porosity
- Scattered porosity
- Incomplete fusion
Correct answer: Wagon tracks
Parallel elongated slag lines flanking the weld root are termed 'wagon tracks' and indicate slag trapped along the root pass interface.
Question 5: Per API 1104, what action is required when a crack is found in a pipeline girth weld during radiographic examination?
- The weld must be rejected regardless of crack length (Correct answer)
- Cracks up to 1 inch are acceptable
- Cracks are acceptable if they do not exceed 10% of weld length
- The weld may be repaired by grinding only
Correct answer: The weld must be rejected regardless of crack length
API 1104 mandates rejection of any weld containing a crack, as cracks are never acceptable under this pipeline welding standard.
Question 6: When assessing incomplete penetration in a butt weld radiograph, what image characteristic distinguishes it from a crack?
- Incomplete penetration appears as a straight dark line with smooth, defined edges at the weld centerline (Correct answer)
- Incomplete penetration has a jagged, branching appearance
- Incomplete penetration always appears lighter than the base metal
- Incomplete penetration is indistinguishable from a crack radiographically
Correct answer: Incomplete penetration appears as a straight dark line with smooth, defined edges at the weld centerline
Incomplete root penetration appears as a continuous straight dark line centered in the weld image with smooth edges, unlike the irregular branching of cracks.
CRI CRI Acceptance Criteria & Discontinuity Evaluation 1
According to AWS D1.1, what is the maximum allowable length of an individual porosity indication in a complete joint penetration groove weld?