CRI Acceptance Criteria & Discontinuity Evaluation Flashcards

According to AWS D1.1, what is the maximum allowable length of an individual porosity indication in a complete joint penetration groove weld?

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.

When evaluating linear indications per ASME Section V, what minimum length causes an indication to be classified as 'relevant'?

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.

Which discontinuity type is generally considered MOST detrimental to weld structural integrity under cyclic loading?

Answer: Cracks

Cracks are the most critical discontinuity under cyclic loading because their sharp tips act as stress concentrators that propagate under fatigue.

In radiographic interpretation, an elongated slag inclusion running parallel to the weld axis is best described as which type of discontinuity?

Answer: Wagon tracks

Parallel elongated slag lines flanking the weld root are termed 'wagon tracks' and indicate slag trapped along the root pass interface.

Per API 1104, what action is required when a crack is found in a pipeline girth weld during radiographic examination?

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.

When assessing incomplete penetration in a butt weld radiograph, what image characteristic distinguishes it from a crack?

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.