Name two non-destructive testing methods commonly used for welds and what they detect.

Name two non-destructive testing methods commonly used for welds and what they detect.

• A. Radiography detects surface flaws; Visual inspection detects internal flaws.
• B. Visual inspection detects surface flaws; Radiography detects thickness and features.
• C. Visual inspection detects surface defects; UT detects internal flaws.
• D. Dye penetrant detects internal flaws; Magnetic particle detects surface roughness.

Answer: (C)

The main idea is matching nondestructive tests to what they reveal in a weld. Visual inspection looks at the surface and can identify defects you can see or that break the surface—cracks, porosity on the surface, undercut, misalignment, or surface irregularities. Ultrasonic testing uses high-frequency sound waves to probe below the surface; reflections from internal discontinuities show up as flaws inside the weld, such as cracks, lack of fusion, slag inclusions, or other internal voids. This combination is effective because one method catches surface problems, while the other detects hidden, internal defects that aren’t visible. Other options mix up what the methods primarily detect (for example, radiography focuses on internal features, dye penetrant and magnetic particle target surface or near-surface flaws), so they don’t pair as cleanly for identifying both surface and internal weld quality.

The main idea is matching nondestructive tests to what they reveal in a weld. Visual inspection looks at the surface and can identify defects you can see or that break the surface—cracks, porosity on the surface, undercut, misalignment, or surface irregularities. Ultrasonic testing uses high-frequency sound waves to probe below the surface; reflections from internal discontinuities show up as flaws inside the weld, such as cracks, lack of fusion, slag inclusions, or other internal voids. This combination is effective because one method catches surface problems, while the other detects hidden, internal defects that aren’t visible. Other options mix up what the methods primarily detect (for example, radiography focuses on internal features, dye penetrant and magnetic particle target surface or near-surface flaws), so they don’t pair as cleanly for identifying both surface and internal weld quality.