UT Lack Of Root Fusion Signal

This video demonstrates the Ultrasonic Testing signal when inspecting a weld with lack of root fusion. Equipment: Olympus EPOCH 1000i UT tester, 70 degree, 4Mhz, 10mm diameter transducer. Welded base metal is 0.625" thick carbon steel plates.
I work at Central Piedmont Community College in Charlotte, NC. Please visit our website to explore your NDE training needs.
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[@eunicef1]

These are really handy demos. Thanks a lot, John.

[@vzwarun2584]

Sir.. how to identify this is Lack of root penetration or lack of fusion. just clarify

[@ruslanibrahimov1768]

HI. Can you take video compare Root LOF and Root undercut ?
Thanks a lot, John. for interesting videos.