UT or RT? How to Choose the Right Method for Weld Inspection
Comparing UT and RT: choosing the right method based on defect type, access conditions, safety and code acceptance.
One of the most frequently asked questions in weld inspection is which method should be preferred between Ultrasonic Testing (UT) and Radiographic Testing (RT).
While both methods are accepted by international standards, the intended use, defect type, access conditions and safety requirements play a decisive role in the selection.
Advantages of RT: • Produces a permanent image record • Achieves high success with volumetric defects such as porosity and slag • Is an internationally accepted classic method • Is effective in inspecting cast components
Advantages of UT / PAUT: • Involves no radiation • Single-sided access is sufficient • Delivers faster results • Is more sensitive to planar defects such as cracks and lack of fusion • Provides digital data and reporting
Conclusion: Today, many projects accept PAUT as an alternative to RT under ASME Code Case 2235. However, the most appropriate method must be determined based on the type of equipment, code requirements and operational risks.
With its expertise in both RT and advanced ultrasonic methods, TESKO offers the most suitable solution for each project.