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Half a U.
The welding symbol for a single-J butt weld, in which one edge is machined to a curved groove.
Specifies a single-J butt weld, in which one edge is machined to a curved groove.
Contexts: Technical drawing
Stands in the same relation to the U as the bevel does to the V, so the four preparations form a two-by-two set: straight or curved, symmetric or single-sided.
Contexts: Technical drawing
A single curved line rising from a vertical line on the reference line, forming half of a U.
A fuller structured visual breakdown is not yet documented for this symbol.