Manual Ultrasonic (UT) Weld Inspection


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Welding is the most widespread way of connecting metallic mechanic parts of industrial equipment. The integrity of these connections during manufacturing as well as during the operation of mechanical equipment is of critical importance for the safety of the installation.


The use of ultrasounds for the integrity inspection of welds is a common practice in the Industry. The applied technique consists of scanning the weld mass and the Heat Affected Zone (HAZ) with ultrasonic beams emitted by angle probe that is moved manually along the lateral region of the weld.


The detection and sizing of discontinuities is performed by receiving and evaluating the beam reflected from the discontinuity surface.


Modern digital instruments with capability of storing the discontinuity signals are used for the inspection. Common UT transverse-wave angle probes are used, while special double-crystal longitudinal-wave probes are used for the inspection of thick-grained steels (stainless steels).


Advantages of the method:

  • Quick and direct results.

  • No protection against radiation required, neither interruption of other peoples work.

  • In-service inspection.

  • Inspection of complex geometry welds with profile analysis of the weld using a PC.

  • Inspections performed according to international standards ASME, EN etc.

  • Final technical report that contains position, depth and type information of discontinuity.

  • Storage of the discontinuities signals and inspection parameters.

  • Sensitivity in critical discontinuities detection (e.g. cracking).


Mistras Group Hellas also provides weld inspection services using the TOFD (Time Of Flight Diffraction) technique and weld inspection services using Eddy Currents.