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Welding Undercut. Undercut is a side effect of the weld metal not filling the grooved area. Undercutting is a groove that develops during a weld.
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Undercuts are grooves along the underlying metal surface in a welded joint. Horizontal fillet weld Fig. Undercutting is common and costly.
This leaves a drain-like impression.
Weld is undercut at two places. This type of defect reduces the strength of the weld and workpieces. Undercutting happens when the weld metal fails to fill in that grooved area. This leaves a drain-like impression.
