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A curve hollowed inward.
Also known as: Concave weld finish
The welding symbol requiring the finished weld face to be concave.
Requires the finished weld face to be hollowed into a concave curve.
Contexts: Technical drawing
Specified where the joint will be loaded in fatigue, because a concave face reduces the stress concentration at the weld toe — a case where the finishing symbol is doing structural work.
Contexts: Technical drawing
A shallow arc hollowed inward, drawn across the outer face of the weld symbol.
One requires the weld face to bulge outward and the other to be hollowed inward.