Convex contour symbol
Also called Convex finish
An arc bulging away from the weld symbol means the finished weld face is convex.
AWS A2.4
ISO 2553
What the convex contour symbol means
An arc bulging away from the weld symbol means the finished weld face is convex.
AWS A2.4 and ISO symbols
Where you see it
Where a full, rounded weld face is wanted, often as welded.
How it is inspected
Inspection of a convex contour usually covers visual inspection of the profile against the acceptance criteria for reinforcement. 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 convex contour symbol look like?
On AWS A2.4 drawings: An arc beyond the weld symbol, bulging away from it. In ISO 2553: The same arc.
Is the convex contour symbol the same in ISO and AWS?
No. The same arc.
Where is a convex contour used?
Where a full, rounded weld face is wanted, often as welded.
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