Welder Red Seal · Question
A certified weld inspector is reviewing Radiographic Testing (RT) films of a full penetration butt weld in 25 mm thick low-alloy carbon steel. They observe several distinct, elongated, dark indications that appear to be randomly oriented within the weld metal. Considering the characteristics of RT images, what is the most probable type of defect indicated?
Slag inclusions typically appear as irregular, elongated dark indications on a radiograph because slag is less dense than the surrounding weld metal and absorbs
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Question: A certified weld inspector is reviewing Radiographic Testing (RT) films of a full penetration butt weld in 25 mm thick low-alloy carbon steel. They observe several distinct, elongated, dark indications that appear to be randomly oriented within the weld metal. Considering the characteristics of RT images, what is the most probable type of defect indicated?
Answer options: ✅ Slag inclusions
- Porosity
- Tungsten inclusions
- Cracks
Correct answer: Slag inclusions
Explanation: Slag inclusions typically appear as irregular, elongated dark indications on a radiograph because slag is less dense than the surrounding weld metal and absorbs less radiation. Porosity appears as rounded, distinct dark spots. Tungsten inclusions would appear as very light, almost white indications due to the high density of tungsten, which absorbs more radiation. Cracks, if discernible, would appear as fine, linear dark lines, often with a precise orientation.
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