UT
Ultrasonic Testing
Summary
Uses high-frequency sound waves to detect internal and surface discontinuities. Can measure material thickness and detect subsurface flaws.
Scope
Volumetric examination of welds and base materials.
Key Requirements
Governing Standards
- ASME Section V, Articles 4 & 5
- AWS D1.1 Clause 6, Part F
- ISO 17640
- ISO 11666
What It Detects
- Cracks (internal and surface-breaking)
- Lack of fusion
- Incomplete penetration
- Slag inclusions
- Laminations in base material
Limitations
- Coarse-grained materials reduce reliability
- Geometry-dependent
- Less effective for porosity than RT
Required Certifications
- ASNT Level II UT
- ISO 9712 Level 2 UT
- PCN Level 2 UT
Applicable Materials
Carbon SteelLow Alloy SteelStainless Steel 304Stainless Steel 316Chrome-Moly (P91)Chrome-Moly (P22)
Applicable Processes
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