J-groove weld
An upright with a curve beside it on the reference line: a J-groove weld, made in a groove with a curved side.
This explains what a symbol specifies on a drawing. It isn't welding instruction, and a drawing's own notes and the governing code take precedence.
How to read it
A groove weld is made by depositing filler metal in a groove between two members to be joined. A J-groove, like a U-groove, is shaped with a groove radius, used only for special groove joint designs. The symbol's vertical leg is drawn on the left, as it is for the fillet and bevel symbols.
Differences by country or standard
India's IS 813:1986, which draws on ISO 2553, calls this weld a single-J butt weld. As with the bevel, its arrow line points toward the plate that is prepared.
More welding symbols
Sources
- Steelworker, Volume 1, NAVEDTRA 14250, 1996, Naval Education and Training Professional Development and Technology Center, U.S. Navy (Internet Archive), Chapter 3, Drawings and specifications
- Welding Theory and Application, TM 9-237, 1967, Department of the Army (Internet Archive), Glossary
- Scheme of symbols for welding, IS 813:1986, Bureau of Indian Standards (Internet Archive, Public.Resource.Org), Table 1; section 5.3
Last reviewed September 25, 2026 by Rory Hansen. How we research