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.
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.
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.
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.
Read next
- Next in Welding symbolsPlug or slot weldA small rectangle on the reference line: a plug or slot weld, made through a hole or slot in one member of a lap joint.
- The same shape in Dashboard warning lightsHeadlight levelling symbolThe headlight levelling control or warning: it sets how high the headlight beams point, which changes with the load in the car.
More welding symbols
The same shape elsewhere
Browse symbols drawn with arrows, curves and waves or lines.
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
Researched, edited and approved by Rory Hansen before publishing. Last reviewed September 25, 2026. How we research
Added .