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Time-of-Flight Diffraction Testing(TOFD)
Time-of-Flight Diffraction Testing (TOFD) is a non - destructive testing that employs a pair of ultrasonic probes (one for transmission and one for reception) symmetrically arranged on both sides of a weld. By capturing the time differences in the propagation of diffraction waves generated at the tips of defects, it can precisely calculate the height and depth of the defects.

Application Scope

Quantification of weld defects in pipelines and storage tanks
Monitoring of active defects in in - service equipment, such as the assessment of stress corrosion cracking (SCC) propagation and the tracking of fatigue crack heights
Testing of special materials and complex structures, such as austenitic stainless steel welds, dissimilar steel welded joints, and small - curvature pipe fittings (elbows)

Technical Features

  • TOFD serves as a "ruler" for the quantitative analysis of weld cracks in the oil and gas field.
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