Time of Flight Diffraction (TOFD)

Time Of Flight Diffraction (TOFD)

Time Of Flight Diffraction (TOFD) Is A Reliable Method Of Nondestructive Ultrasonic Testing (UT) Used To Look For Flaws In Welds. TOFD Uses The Time Of Flight Of An Ultrasonic Pulse To Find The Location Of A Reflector. It Can Also Be Used For Weld Overlays And The Heat Affected Zones Of Other Components As Well Such As Piping, Pressure Vessels, Clad Material, Storage Tanks, And Structural Steel

Main Benefits Of TOFD For Weld Inspection

• Based On Diffraction, So Relatively Indifferent To Weld Bevel Angles And Flaw Orientation

• Uses Time Of Arrival Of Signals Received From Crack Tips For Accurate Defect Positioning And Sizing

• Precise Sizing Capability Makes It An Ideal Flaw Monitoring Method

• Quick To Set Up And Perform An Inspection, As A Single Beam Offers A Large Area Of Coverage

• Rapid Scanning With Imaging And Full Data Recording

• Can Also Be Used For Corrosion Inspections

• Required Equipment Is More Economical Than Phased Array, Due To Conventional Nature (Single Pulser And Reciever) And Use Of Conventional Probes

• Highly Sensitive To All Weld Flaw Types

Combined Technique – Phased Array & TOFD

By Utilizing Both Techniques We Offer The Most Flexibility And Power For

• Inspection Coverage And Code Compliance

• Better Detection And Sizing

• Correlation And Assessment