Ultrasonic Testing (UT) is a powerful nondestructive method used to locate internal weld defects using high-frequency sound waves. UT is essential for critical welds where internal quality cannot be verified visually.
Inspectors use angled and straight-beam probes to transmit sound into the weld and heat-affected zone. Reflected signals are measured and interpreted to identify subsurface defects such as lack of fusion, inclusions, voids, cracks, and incomplete penetration.
UT is commonly used for:
Because UT provides precise defect detection and sizing, it is often required by engineers and code authorities. It supports AWS, ASME, and API acceptance criteria and ensures internal weld quality meets project specifications.
