J groove weld symbol
Also called Single-J butt weld
A J groove weld has one edge machined to a J shape and the other left square. It is the half-U, as the bevel is the half-V.
What the J groove weld symbol means
A J groove weld has one edge machined to a J shape and the other left square. It is the half-U, as the bevel is the half-V.
AWS A2.4 and ISO symbols
Where you see it
Thick T, corner and butt joints where only one member is prepared.
What is written next to it
On the welding symbol, the J groove weld carries the groove depth, root opening and groove angle.
How it is inspected
Inspection of a J groove weld usually covers visual inspection and ultrasonic testing for full-penetration joints. 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 J groove weld symbol look like?
On AWS A2.4 drawings: A vertical leg with a curve, the vertical leg on the left. In ISO 2553: The same J, on the solid line for an arrow side weld.
Is the J groove weld symbol the same in ISO and AWS?
No. The same J, on the solid line for an arrow side weld.
Where is a J groove weld used?
Thick T, corner and butt joints where only one member is prepared.
- In production since 2014
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- On MODEC FPSO projects since 2016