For the detection and sizing of flaws in new and in-services welds and components, we offer the semi-automated Time of Flight Diffraction (TOFD) ultrasonic technique.

Technique:

TOFD inspection employs two longitudinal wave (L-wave) angle beam transducers arranged symmetrically opposite facing each other, straddling the weld or base material under test. One probe acts like a transmitter of ultrasonic energy while the other probe receives the ultrasound energy. The transducer, pulsar, and amplifier characteristics are selected to generate as broad distribution of energy as possible over the material under test providing full weld coverage. A single-axis scan (that is, along the weld), with a position encoder records the position of the weld and enables the display of digital images in real time.

Capabilities

Because of the high test speed the costs are less than those for radiography for wall thickness above 25 mm. Versatile and portable equipment.

Applications

  • New and existing welds
  • Defect monitoring
  • Stress Corrosion Cracking
  • Weld root erosion surveys