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A U on the line.
The welding symbol for a single-U butt weld, made between two edges machined to a curved groove.
Specifies a single-U butt weld, made between two edges machined to a curved groove.
Contexts: Technical drawing
Requires machining rather than flame cutting and uses less filler metal than a V on thick sections, so it is chosen where material cost outweighs preparation cost.
Contexts: Technical drawing
A U with a rounded base and near-vertical sides, sitting on the reference line.
A fuller structured visual breakdown is not yet documented for this symbol.