U groove weld symbol
Also called Single-U butt weld
A U groove weld fills a groove with a rounded bottom machined into both edges. It needs less weld metal than a V on thick sections.
What the U groove weld symbol means
A U groove weld fills a groove with a rounded bottom machined into both edges. It needs less weld metal than a V on thick sections.
AWS A2.4 and ISO symbols
Single-U butt weld. The same U on a stem, on the solid line for an arrow side weld.
ISO SVGWhere you see it
Thick plate and heavy-wall pipe, where a V groove would take too much weld metal.
What is written next to it
On the welding symbol, the U groove weld carries the groove depth, root opening and the groove angle where it is specified.
How it is inspected
Inspection of a U groove weld usually covers visual inspection and volumetric testing, radiography or ultrasonic, as the code requires. Each inspection is recorded against the weld, so the joint can be signed off with its evidence. See the ITR guide.
Related symbols
Frequently asked questions
What does the U groove weld symbol look like?
On AWS A2.4 drawings: A U shape on a short stem from the reference line. In ISO 2553: The same U on a stem, on the solid line for an arrow side weld.
Is the U groove weld symbol the same in ISO and AWS?
No. The same U on a stem, on the solid line for an arrow side weld.
Where is a U groove weld used?
Thick plate and heavy-wall pipe, where a V groove would take too much weld metal.
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