WELDINGResources / Welding symbolsUpdated 29 Oct 2026

Groove weld symbols

Groove welds (butt welds in ISO terms) join parts edge to edge, usually after the edges are prepared. The symbol shows the shape of the preparation: square, V, bevel, U, J or flare.

SymbolAWS A2.4ISO 2553What it is

Square groove weldA square groove weld joins two plates edge to edge with no bevel on either edge.

V groove weldA V groove weld fills a V-shaped groove made by bevelling both edges.

Bevel groove weldA bevel groove weld has only one edge bevelled; the other is left square.

U groove weldA U groove weld fills a groove with a rounded bottom machined into both edges.

J groove weldA J groove weld has one edge machined to a J shape and the other left square.

Flare-V groove weldA flare-V groove weld joins two curved surfaces, such as two round bars or two bent plate edges, where the groove is formed by the curves.

Flare-bevel groove weldA flare-bevel groove weld joins a curved surface to a flat one, such as a tube or bar laid against a plate.

Double-V groove weldA double-V groove weld is a V groove on both sides of the joint.

Double-bevel groove weldA double-bevel groove weld bevels one member on both sides, giving a K shape.

V groove with broad root faceA V groove that stops short of the full thickness, leaving a broad root face.

Groove welds: AWS and ISO

The groove symbols themselves look the same in AWS A2.4 and ISO 2553. What differs is where they sit. AWS puts an arrow side weld below the reference line; ISO 2553 system A puts it on the solid line and adds a dashed line for the other side. The bevel and J symbols always draw the straight leg on the left, whichever member is prepared.

A weld on both sides doubles the symbol: a double V (an X in ISO terms) or a double bevel (a K). For a symmetrical weld ISO leaves out the dashed line.

Frequently asked questions

Which groove welds appear on a welding drawing?

This legend covers square groove weld, V groove weld, bevel groove weld, U groove weld, J groove weld, flare-V groove weld, flare-bevel groove weld, double-V groove weld, double-bevel groove weld, V groove with broad root face. Project legends may add more.

Are these symbols different in ISO and AWS?

8 of the 10 are drawn differently. Each symbol page shows both forms side by side.

Can I download these symbols?

Yes. Each symbol page has free SVG files, and the hub has printable PDF charts.

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Groove welds: AWS and ISO

Frequently asked questions

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